Click here to view the PDF file of the P1763 Transmission Diagnostic Check List. Big thanks to zman17 for providing the file.

 

Symptom:
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH
When Monitored and Set Condition:
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH
When Monitored: Continuously with the key on and engine running.
Set Condition: The voltage from the Governor Pressure Sensor is above 4.89 volts for 8.5
seconds.
POSSIBLE CAUSES
5-VOLT SUPPLY CIRCUIT OPEN
GOVERNOR PRESSURE SENSOR GROUND CIRCUIT OPEN
GOVERNOR PRESSURE/TEMPERATURE SENSOR
GOVERNOR PRESS SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
GOVERNOR PRESSURE SENSOR SIGNAL CIRCUIT OPEN
GOVERNOR PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
TRANSMISSION HARNESS/SOLENOID (SIGNAL CIRCUIT > 5.0 OHMS)
TRANSMISSION HARNESS/SOLENOID ASSY (SIGNAL CIRCUIT)
GOVERNOR PRESSURE/TEMPERATURE SENSOR
POWERTRAIN CONTROL MODULE
TRANS HARNESS/SOLENOID (GROUND CIRCUIT > 5.0 OHMS) (GROUND CIRCUIT)
TRANS HARNESS/SOLENOID (SIGNAL CIRCUIT > 1.0 VOLT) (SIGNAL CIRCUIT)
TRANSMISSION HARNESS/SOLENOID ASSY (GROUND CIRCUIT)
TRANSMISSION HARNESS/SOLENOID ASSY
GOVERNOR PRESSURE SENSOR WIRING HARNESS INTERMITTENT
GOVERNOR PRESSURE SENSOR WIRING HARNESS
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running.
Using the DRB, read and record DTC’s and Freeze Frame Data.
Is the DTC Specific Good Trip displayed and equal to 0?
All
Yes ® Go To 2
No ® Go To 22
580
TRANSMISSION
TEST ACTION APPLICABILITY
2 This Code is present at this time.
Ignition Off.
Disconnect the Trans Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Key On.
Using a Voltmeter, measure the voltage at the 5-Volt Supply Circuit.
Is the voltage between 4.5 and 5.5 volts?
All
Yes ® Go To 3
No ® Repair open 5-Volt Supply Circuit.
Perform Powertrain Verification Test VER-5A.
3 Ignition On, Engine Not Running.
With the DRB, read the Governor Pressure voltage.
Is the voltage above 4.65 volts?
All
Yes ® Go To 4
No ® Go To 12
4 Ignition Off.
Disconnect the Transmission Solenoid Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Sensor Ground Circuit from the
PCM Connector to the Solenoid Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Repair the open Sensor Ground Circuit.
Perform Powertrain Verification Test VER-5A.
No ® Go To 5
5 Ignition Off.
Disconnect the Transmission Solenoid Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Governor Pressure Sensor Signal
Circuit from the PCM Connector to the Solenoid Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Repair the open Governor Pressure Sensor Signal Circuit.
Perform Powertrain Verification Test VER-5A.
No ® Go To 6
581
TRANSMISSION
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH — Continued
TEST ACTION APPLICABILITY
6 Ignition Off.
Remove the Trans Control Relay.
Disconnect the Transmission Solenoid Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire from the Fused B(+) Circuit to the Trans Control Relay
Output Circuit in the Relay Connector.
Key On.
Measure the voltage at the Governor Pressure Sensor Signal Circuit at the PCM
Connector.
Is the voltage above 1.0 volt?
All
Yes ® Repair the Governor Pressure Signal Circuit for short to voltage.
Perform Powertrain Verification Test VER-5A.
No ® Go To 7
7 Ignition Off.
Remove the Transmission Oil Pan.
Disconnect the Governor Pressure Sensor Connector.
Note: Check connectors - Clean/repair as necessary.
Carefully insert a jumper wire between the Governor Pressure Sensor Signal Circuit
and the Sensor Ground Circuit in the Sensor Connector.
Key On.
With the DRB read the Governor Pressure Sensor voltage .
Is the voltage above 0.1 volts?
All
Yes ® Go To 8
No ® Replace the Pressure/Temp Sensor.
Perform Powertrain Verification Test VER-5A.
8 Ignition Off.
Note: The Transmission Solenoid Connector must not be disconnected.
Remove the Trans Oil Pan.
Disconnect the Pressure/Temp Sensor Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Governor Pressure Sensor Signal Circuit from the
PCM Connector to the Governor Pressure Sensor Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER-5A.
No ® Go To 9
9 Ignition Off.
Note: The Transmission Solenoid Connector must not be disconnected.
Remove the Trans Oil Pan.
Disconnect the Pressure/Temp Sensor Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Sensor Ground Circuit from the
PCM Connector to the Governor Pressure Sensor Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER-5A.
No ® Go To 10
582
TRANSMISSION
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH — Continued
TEST ACTION APPLICABILITY
10 Ignition Off.
Remove the Trans Control Relay.
Remove the Trans Oil Pan.
Disconnect the Pressure/Temp Sensor Connector.
Disconnect all of the PCM Connectors.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ Circuit and the Trans Control Relay
Output Circuit in the Relay Connector.
Key On.
Using a Voltmeter, measure the voltage at the Governor Pressure Signal Circuit.
Is the voltage above 1.0 volt?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER-5A.
No ® Go To 11
11 If there are no potential causes remaining.
View repair options.
All
Repair
Replace the PCM.
Perform Powertrain Verification Test VER-5A.
12 Ignition On, Engine Not Running.
With the DRB, read the Governor Pressure Sensor voltage.
Is the voltage below 0.12 volt?
All
Yes ® Refer to symptom P-1764 GOVERNOR PRESSURE SENSOR
VOLTS TOO LOW in the TRANSMISSION category.
No ® Go To 13
13 Ignition On, Engine Not Running.
With the DRB, read the Governor Pressure Sensor voltage.
Is the voltage between 0.12 and 0.80 volts?
All
Yes ® Go To 22
No ® Go To 17
14 Ignition Off.
Disconnect the PCM Connectors.
Disconnect the Transmission Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Sensor Ground Circuit from the
PCM Connector to the Solenoid Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Repair the open Sensor Ground Circuit.
Perform Powertrain Verification Test VER-5A.
No ® Go To 15
583
TRANSMISSION
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH — Continued
TEST ACTION APPLICABILITY
15 Ignition Off.
Remove the Trans Control Relay.
Disconnect all PCM Connectors.
Disconnect the Transmission Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ Circuit and the Trans Control Relay
Output Circuit in the Relay Connector.
Key On.
Using an Ohmmeter, measure the voltage of the Governor Pressure Signal Circuit.
Is the voltage above 1.0 volt?
All
Yes ® Repair the Governor Pressure Sensor Signal Circuit for a short to
voltage.
Perform Powertrain Verification Test VER-5A.
No ® Go To 16
16 Ignition Off.
Disconnect the PCM Connectors.
Disconnect the Transmission Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Governor Pressure Sensor Signal
Circuit from the PCM Connector to the Solenoid Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Repair the open Governor Pressure Sensor Signal Circuit.
Perform Powertrain Verification Test VER-5A.
No ® Go To 18
17 Ignition Off.
Disconnect the White PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Key On.
With the DRB, monitor Governor Pressure Sensor voltage.
Is the voltage above 4.65 volts?
All
Yes ® Go To 14
No ® Replace the PCM.
Perform Powertrain Verification Test VER-5A.
18 Ignition Off.
Note: The Transmission Solenoid Connector must not be disconnected.
Disconnect the PCM Connectors.
Remove the Transmission Oil Pan.
Disconnect the Governor Pressure/Temperature Sensor Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Governor Pressure Sensor Signal
Circuit from the PCM Connector to the Governor Pressure Sensor Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER- 5A.
No ® Go To 19
584
TRANSMISSION
P-1763 GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH — Continued
TEST ACTION APPLICABILITY
19 Ignition Off.
Disconnect the PCM Connectors.
Remove the Transmission Oil Pan.
Disconnect the Governor Pressure/Temperature Sensor Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Sensor Ground Circuit from the
PCM Connector to the Governor Pressure Sensor Connector.
Is the resistance above 5.0 ohms?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER- 5A.
No ® Go To 20
20 Ignition Off.
Remove the Transmission Oil Pan.
Disconnect the PCM Connectors.
Disconnect the Governor Pressure/Temperature Sensor Connector.
Remove the Trans Control Relay.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ Circuit and the Trans Control Relay
Circuit in the Relay Connector.
Key On.
Using a Voltmeter, measure the voltage at the Governor Pressure Sensor Signal
Circuit.
Is the voltage above 1.0 volt?
All
Yes ® Replace the Transmission Harness/Solenoid Assembly.
Perform Powertrain Verification Test VER- 5A.
No ® Go To 21
21 If there are no potential causes remaining.
View repair options.
All
Repair
Replace the Pressure/Temperature Sensor.
Perform Powertrain Verification Test VER-5A.
22 This is an intermittent code.
Using the DRB, go to the Freeze Frame Screen. Make sure the 9Caused By DTC9
P-Code matches the Code on the DTC Screen. Use this information to help determine
the conditions when the Code was set.
Ignition Off.
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes ® Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No ® Go To 23
23 Key on.
While monitoring Govenor Pressure voltage with DRB, wiggle the Wiring and
Connectors between the Governor Pressure Sensor and the PCM.
Did the voltage fluctuate while wiggling the Harness?
All
Yes ® Repair Wiring where wiggling caused the fluctuation.
Perform Powertrain Verification Test VER-5A.
No ® Refer to any T.S.B.’s that may apply. Test complete.
Perform Powertrain Verification Test VER-5A.

 

Here P1762 and I will put some others there for you folks.

Symptom:
P-1762 GOV PRESS SEN OFFSET VOLTS TOO LO OR HIGH
When Monitored and Set Condition:
P-1762 GOV PRESS SEN OFFSET VOLTS TOO LO OR HIGH
When Monitored: Continuously with the key on and engine running.
Set Condition: A fault condition is identified if the governor pressure is out of range in
park or neutral for 1.3 seconds. The code will be set after three consecutive bad tests.
POSSIBLE CAUSES
5-VOLT SUPPLY CIRCUIT OPEN
GOVERNOR PRESSURE SENSOR WIRING HARN INTERMITTENT
GOVERNOR PRESSURE SENSOR GROUND CIRCUIT OPEN
PARK/NEUTRAL SWITCH
PARK/NEUTRAL SWITCH NOT OPERATING CORRECTLY
GOVERNOR PRESSURE SENSOR HARNESS INTERMITTENT
GOVERNOR PRESSURE SENSOR HARNESS
TRANSMISSION FLUID EXCESSIVE DEBRIS
TRANSMISSION FLUID PROBLEM
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running.
Using the DRB, read DTC’s.
Is the DTC specific good trip displayed?
All
Yes ® Go To 2
No ® Go To 10
2 This code is present at this time.
Start Engine and allow to warm up.
Check Fluid level and condition of Fluid.
Was fluid condition and level OK?
All
Yes ® Go To 3
No ® Repair fluid level and/or condition of bad fluid and retest.
Perform Powertrain Verification Test VER-5A.
3 Start Engine and allow to warm up.
With the DRB, check Park/Neutral Switch for proper operation.
Was Park/Neutral operation OK?
All
Yes ® Go To 4
No ® Repair as necessary.
Perform Powertrain Verification Test VER-5A.
577
TRANSMISSION
TEST ACTION APPLICABILITY
4 Start Engine. Let Engine idle in park or neutral for 3 minutes.
Place vehicle in neutral.
With the DRB, read the Governor Pressure Sensor voltage.
Was the voltage between 0.3 and 0.76 volts?
All
Yes ® Go To 10
No ® Go To 5
5 Check and record the Freeze Frame data.
Ignition On, Engine Not Running.
Disconnect the Trans Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Using a voltmeter, measure voltage at the 5-Volt Supply Circuit in Trans Solenoid
Connector.
Was voltage above 4.5 volts?
All
Yes ® Go To 6
No ® Repair open 5-Volt Supply Circuit.
Perform Powertrain Verification Test VER-5A.
6 Start Engine.
While monitoring Governor Pressure Sensor voltage, wiggle the wires between the
PCM and the Solenoid Connector.
Did the Governor Pressure Sensor voltage fluctuate while wiggling the wires?
All
Yes ® Repair Wiring where wiggling caused the fluctuation.
Perform Powertrain Verification Test VER-5A.
No ® Go To 7
7 Ignition Off.
Disconnect the Trans Solenoid Connector.
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Sensor Ground Circuit from the
PCM Connector to the Solenoid Connector.
Was the resistance below 5.0 ohms?
All
Yes ® Go To 8
No ® Repair open Sensor Ground Circuit.
Perform Powertrain Verification Test VER-5A.
8 Ignition On, Engine Not Running
Check freeze frame data to determine the conditions when the code set.
With the DRB, clear DTCs.
Start Engine. Let Engine idle in park or neutral for 3 minutes.
Did code come back after 3 minutes of engine idling?
All
Yes ® Go To 9
No ® Go To 10
578
TRANSMISSION
P-1762 GOV PRESS SEN OFFSET VOLTS TOO LO OR HIGH — Continued
TEST ACTION APPLICABILITY
9 Ignition Off.
Replace the Governor Pressure Sensor.
Perform Verification Test VER-5A.
Check Pan and/or Filter for excessive debris while changing Sensor.
Does the pan and/or filter contain excessive debris?
All
Yes ® Repair cause of excessive debris.
Perform Powertrain Verification Test VER-5A.
No ® Test Complete.
Perform Powertrain Verification Test VER-5A.
10 Ignition On, Engine Not Running
With the DRB, check the Park/Neutral Switch State for proper operation.
Was Park/Neutral operation OK?
All
Yes ® Go To 11
No ® Repair Park/Neutral Switch System as necessary.
Perform Powertrain Verification Test VER-5A.
11 Ignition On, Engine Not Running
While monitoring governor pressure voltage with DRB, wiggle the Wiring and
Connectors between the Governor Pressure Sensor and the PCM.
Did the voltage fluctuate while wiggling the Harness?
All
Yes ® Repair Wiring where wiggling caused the fluctuation.
Perform Powertrain Verification Test VER-5A.
No ® Go To 12
12 At this time, the condition required to set the code is not present.
Using the DRB, go to the freeze frame screen. Make sure the 9caused by DTC9 P code
matches the code on the DTC screen. Use this information for added diagnostics to
help determine the conditions when the code was set.
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes ® Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No ® Test Complete.

 

Symptom:
P-1757 GOV PRES ABOVE 3 PSI IN GEAR WITH 0 MPH
When Monitored and Set Condition:
P-1757 GOV PRES ABOVE 3 PSI IN GEAR WITH 0 MPH
When Monitored: Continuously with the key on and engine running.
Set Condition: A fault condition is identified if output of governor pressure sensor is
above 3 PSI when the requested pressure is 0 PSI with the Governor Pressure Solenoid
duty cycle at 95% for 2.65 seconds. Code is set when after 2 consecutive bad 2.65 second
tests.
POSSIBLE CAUSES
OTHER TRANSMISSION CODES
5-VOLT SUPPLY CIRCUIT OPEN
TRANSMISSION MECHANICAL PROBLEM
VALVE BODY
WIRING AND CONNECTORS
WIRING HARNESS INTERMITTENT
GOVERNOR PRESSURE SENSOR
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, read DTC’s.
Is the DTC specific good trip displayed and equal to zero?
All
Yes ® Go To 2
No ® Go To 8
2 The DTC is present at this time.
Check freeze frame data to determine the conditions when the code set. Utilize freeze
frame data for added diagnostics.
Check for other Transmission codes.
Are there other Transmission codes?
All
Yes ® Refer to Symptom list for problems related to transmission.
No ® Go To 3
3 Start the engine.
Warm engine to normal operating temperature.
With the DRB, read Governor Pressure Sensor.
Place gear select in Drive.
Is the governor pressure above 3 PSI?
All
Yes ® Go To 4
No ® Go To 8
574
TRANSMISSION
TEST ACTION APPLICABILITY
4 Key off.
Install a pressure gauge at governor test port.
Start engine.
Read the gauge pressure in drive.
Is gauge pressure below 3 PSI?
All
Yes ® Go To 5
No ® Go To 6
5 Ignition Off
Disconnect the Solenoid Pack Connector.
Note: Check connectors - Clean/repair as necessary.
Key on.
Measure the voltage at the 5-Volt Supply Circuit.
Is the voltage above 4.5 volts?
All
Yes ® Replace Governor Pressure Sensor.
Perform Powertrain Verification Test VER-5A.
No ® Repair open 5-Volt Supply Circuit to Solenoid Pack Connector.
Perform Powertrain Verification Test VER-5A.
6 Ignition Off
Drain and remove the Transmission Oil Pan.
Inspect for burnt transmission fluid or debris.
Was fluid burnt and/or debris in pan?
All
Yes ® Overhaul Transmission as necessary.
Perform Powertrain Verification Test VER-5A.
No ® Go To 7
7 Ignition Off
Using service information, replace Governor Pressure Solenoid.
Start engine.
Read the gauge pressure in drive.
Is gauge pressure below 3 PSI?
All
Yes ® Test Complete.
No ® Replace the Valve Body.
Perform Powertrain Verification Test VER-5A.
8 This is an intermittent code.
Using the DRB, go to the freeze frame screen. Make sure the 9caused by DTC9 P-Code
matches the code on the DTC screen. Use this information for added diagnostics to
help determine the conditions when the code was set.
At this time, the condition required to set the code is not present.
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes ® Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No ® Go To 9
575
TRANSMISSION
P-1757 GOV PRES ABOVE 3 PSI IN GEAR WITH 0 MPH — Continued
TEST ACTION APPLICABILITY
9 With the DRB, clear DTCs.
Drive the vehicle 0-20 MPH. Come to a complete stop for 20 seconds.
Repeat procedure 5 times.
Did the P-1757 GOVERNOR PRESSURE ABOVE 3 PSI IN GEAR WITH 0 MPH
appear?
All
Yes ® Repair Wiring as necessary.
Perform Powertrain Verification Test VER-5A.
No ® Go To 10
10 If there are no other possible causes remaining.
View repair options.
All
Repair
Visually inspect related Wire Harness Connectors and Harnesses.
Look for broken, bent, pushed out, or corroded terminals and for
chafed, pierced, or partially broken wire. Refer to any technical
service bulletins that apply.

 

Symptom:
P-1756 GOV PRESS NOT EQUAL TO TARGET @ 15-20 PSI (GAS)
When Monitored and Set Condition:
P-1756 GOV PRESS NOT EQUAL TO TARGET @ 15-20 PSI (GAS)
When Monitored: Continuously with the key on and the engine running.
Set Condition: This code will set if the output of the governor pressure sensor is below 15
PSI or above 30 PSI when the requested pressure is between 20 and 25 PSI for 2.2 seconds.
Five consecutive bad 2.2 second test are required to set the code.
POSSIBLE CAUSES
5 VOLT SUPPLY CIRCUIT OPEN
INTERMITTENT GOVERNOR PRESSURE SOLENOID
INTERNAL TRANSMISSION PROBLEM
OIL BURNT OR OIL PAN HAS EXCESSIVE DEBRIS
OTHER TRANSMISSION DTC’S
VALVE BODY
GOVERNOR PRESSURE SENSOR (HIGH)
PCM
TEST ACTION APPLICABILITY
1 With the DRB III read DTC’s.
Note: You may be removing the Transmission Control Relay during this test,
this will set other codes. They can be disregarded.
Is the Specific Good Trip counter for P-1756 displayed and Equal to 0?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 2
No ® Go To 5
2 With the DRB III read DTC’s.
Are there any other transmission DTC’s present?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Repair all other transmission DTC’s before proceeding.
Perform Transmission DTC Verification Test.
No ® Go To 3
566
TRANSMISSION
TEST ACTION APPLICABILITY
3 Caution: Apply the parking brake.
Start Engine.
Warm the engine to normal operating temperature.
With the DRBIIIt read the Governor Pressure Sensor.
Apply Brakes.
Place gear selector in drive.
Is the Governor Pressure above 3 PSI?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 12
No ® Go To 8
4 Turn Ignition Off.
Install a Pressure Gauge at the Governor Test Port.
Caution: Apply the parking brake.
Start Engine.
Warm the engine to normal operating temperature.
Apply Brakes.
Place gear selector in drive.
Read the Gauge pressure in drive.
Is the Gauge pressure below 5 PSI?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 5
No ® Go To 11
5 Turn Ignition Off.
Disconnect the Transmission Solenoid connector.
Note: Check connectors - Clean/repair as necessary.
Turn ignition on.
Measure the voltage of the 5 Volt Supply circuit at the Transmission Solenoid
connector.
Is the voltage above 4.5 volts?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 6
No ® Repair the open 5 Volt Supply Circuit.
Perform the Transmission DTC Verification test.
6 Start Engine.
Place gear selector in neutral.
With the DRBIIIt read Governor Pressure Sensor voltages.
Using a voltmeter back probe the Governor Pressure Sensor Signal circuit at the
PCM.
Compare the two readings between the Governor Pressure Sensor Signal voltage to
the DRBIIIt Governor Pressure Sensor Signal voltage.
Does the DRBIIIt Governor Pressure Sensor voltage match the Governor Pressure
Sensor voltage on the voltmeter?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 7
No ® Replace the PCM.
Perform the Transmission DTC Verification test.
7 If there are no potential causes remaining, the Governor Pressure Sensor is assumed
to be defective.
Continue
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Replace the Governor Pressure Sensor Assembly
Perform the Transmission DTC Verification test.
567
TRANSMISSION
P-1756 GOV PRESS NOT EQUAL TO TARGET @ 15-20 PSI (GAS) —
Continued
TEST ACTION APPLICABILITY
8 Caution: Apply the parking brake.
Place gear selector in Park.
Start Engine.
Warm the engine to normal operating temperature.
With the DRBIIIt read the Governor Pressure Sensor.
With the engine still running, remove the Transmission Control Relay.
Caution: Apply brakes.
Place gear selector in Drive.
Is the Governor Pressure between 40 and 55 PSI?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 5
No ® Go To 11
9 Turn Ignition Off.
Replace the Governor Pressure Solenoid.
Warm the engine to normal operating temperature.
With the DRBIIIt monitor the target governor pressure and actual governor
pressure.
Drive the vehicle at a constant speed between 25 and 30 MPH.
Note: The actual governor pressure should be within 5 PSI of the governor
target pressure within 3 seconds.
Is the actual governor pressure within 5 PSI of target pressure?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Test Complete.
No ® Repair the internal transmission leakage problem.
Perform Transmission DTC Verification Test.
10 Turn Ignition Off.
Install a pressure gauge at the Governor test port.
Caution: Apply the parking brake.
Place gear selector in Park.
Start Engine.
Warm the engine to normal operating temperature.
With the engine still running, remove the Transmission Control Relay.
Caution: Apply brakes.
Place gear selector in Drive.
Is the gauge pressure between 40 and 55 PSI?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Test Complete.
No ® Go To 13
11 Turn Ignition Off.
Install a pressure gauge at the Governor test port.
Replace the Governor Pressure Solenoid, per the service instructions.
Start Engine.
Warm the engine to normal operating temperature.
Apply brakes.
Place gear selector in drive.
Read the gauge pressure in Drive.
Is the gauge pressure below 5 PSI?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Go To 12
No ® Replace the valve body.
Perform Transmission DTC Verification Test.
568
TRANSMISSION
P-1756 GOV PRESS NOT EQUAL TO TARGET @ 15-20 PSI (GAS) —
Continued
TEST ACTION APPLICABILITY
12 Turn Ignition Off.
Remove the Transmission Oil Pan and inspect for excessive debris and burnt oil.
Is the oil burnt or does the Oil Pan contain excessive debris?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Overhaul the Transmission as necessary.
Perform Transmission DTC Verification Test.
No ® Test Complete.
13 At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
TRANSMISSION -
AUTOMATIC
4-SPD, 42RE
Yes ® Repair as necessary.
Perform Transmission DTC Verification Test.
No ® Test Complete.

 

Symptom:
P1768-RELAY OUTPUT ALWAYS OFF
When Monitored and Set Condition:
P1768-RELAY OUTPUT ALWAYS OFF
When Monitored: Continuously after a controller reset (ignition key turned to the RUN
position or when the cranking engine), the TCM then energizes the Trans Control Relay
(switched battery).
Set Condition: The codes sets when the Trans Control Module (TCM) senses less than 3
volts are present at the Trans Control Relay Output (switched Battery) terminals of the
TCM, when the TCM is energizing the relay.
POSSIBLE CAUSES
CHECKING SYMPTOMS AND POSSIBLE CAUSES
LOW BATTERY VOLTAGE CAUSING SYMPTOM
FUSED B(+) CIRCUIT TO TRANS CTRL RELAY OPEN
TCR GROUND CIRCUIT OPEN
TRANSMISSION CONTROL RELAY CIRCUIT OPEN
TCM PIN 16 TO TCR OPEN OR BAD CONNECTION
TCM PIN 17 TO TCR OPEN OR BAD CONNECTION
NO OUTPUT FROM TRANSMISSION CONTROL RELAY
TRANSMISSION CONTROL RELAY DEFECTIVE
TCM DEFECTIVE

 

Symptom:
P0753-TRANS 3-4 SHIFT SOL/TRANS RELAY CIRCUITS
When Monitored and Set Condition:
P0753-TRANS 3-4 SHIFT SOL/TRANS RELAY CIRCUITS
When Monitored: Continuously with the key on.
Set Condition: This code will set if the voltage detected on the 3-4 Shift Solenoid Control
circuit at the PCM is different than the expected voltage.
POSSIBLE CAUSES
TRANSMISSION CONTROL RELAY
INTERMITTENT 3-4 SOLENOID
3-4 SHIFT SOLENOID
3-4 SHIFT SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
3-4 SHIFT SOLENOID CONTROL CIRCUIT OPEN
3-4 SHIFT SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE
FUSED B(+) OPEN
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORTED TO GROUND
PCM
TEST ACTION APPLICABILITY
1 Note: If all three solenoid codes P-0743, P-0748, P-0753 are present at the
same time, perform symptom P-1765 Transmission 12 Volt Supply Relay
control circuit, before proceeding.
Turn the ignition on.
With the DRB, read DTCs.
Is the Specific Good Trip Counter for P-0753 displayed and equal to 0?
All
Yes ® Go To 2
No ® Go To 14
2 Road test the vehicle. Attain a vehicle speed of at least 80 kmh (50 MPH).
Slowly push the O/D Off Switch 4 times so that the vehicle attempts to shift from 3rd
to 4th and back.
Did the vehicle shift between 3rd and 4th?
All
Yes ® Go To 3
No ® Go To 4

 

Symptom:
P-0783 3-4 SHIFT SOLENOID, NO RPM DROP @ 3-4 SHIFT
When Monitored and Set Condition:
P-0783 3-4 SHIFT SOLENOID, NO RPM DROP @ 3-4 SHIFT
When Monitored: Continuously with the key on and engine running.
Set Condition: This code is set if the expected engine RPM drop does not occur within 4
seconds of the gear change being requested by the PCM. Three consecutive bad tests are
required to set the code.
POSSIBLE CAUSES
TRANSMISSION DEFECTIVE (INTERNAL)
TRANSMISSION DEFECTIVE (OVERHAUL)
TRANSMISSION FLUID CONTAMINATED
NO POSSIBLE CAUSES REMAINING
TPS CODES SET
TRANSMISSION 3-4 SHIFT SOLENOID WIRING HARNESS INTERMITTENT DEFECT
TRANSMISSION 3-4 SOLENOID WIRING HARNESS OBSERVABLE DEFECT

 

Thanks guys.