My 02 Stratus 2.7 recently started acting up. Hard to start but ran great once it was running. I had a previous problem with the speedometer jumping around when I first started the car. I just found out that the VSS shares the same voltage circuit as a cam position sensor could these two issues be tied together somehow? I replaced the cam sensor this morning but the problem returned. I sprayed cleaned the cam sensor plug with contact cleaner after it was cooled and the car started right up.
I believe part of the issue is heat related.

 

The Vehicle speed sensor would be the output sensor on the transmission. I would inspect the wires going to the sensor.

 

Symptom:
P0340-NO CAM SIGNAL AT PCM
When Monitored and Set Condition:
P0340-NO CAM SIGNAL AT PCM
When Monitored: Engine cranking/running. Battery voltage greater than 10 volts.
Set Condition: At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft
position sensor signals present but no camshaft position sensor signal.
POSSIBLE CAUSES
INTERMITTENT CRANKSHAFT POSITION SENSOR SIGNAL
INTERMITTENT CAMSHAFT POSITION SENSOR SIGNAL
INTERMITTENT WIRING
INTERMITTENT CONDITION
8 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
8 VOLT SUPPLY CIRCUIT OPEN
8 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED GROUND
CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT OPEN
CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
CAMSHAFT POSITION SENSOR SIGNAL SHORTED TO 8 VOLT SUPPLY CIRCUIT
SENSOR GROUND CIRCUIT OPEN
PCM - 8 VOLT SUPPLY
PCM - CAMSHAFT POSITION SENSOR SIGNAL
CAMSHAFT POSITION SENSOR
TEST ACTION APPLICABILITY
1 With the DRBIIIt, read the Current Camshaft Position (CMP) Sensor State while
cranking the engine.
Does the DRBIIIt display Current CMP State Present while cranking the engine.
All
Yes ! Go To 2
No ! Go To 6
138
TEST ACTION APPLICABILITY
2 Turn the ignition off.
With the DRBIIIt lab scope probe and the Miller special tool #6801, back probe the
Crankshaft Position (CKP) Sensor signal circuit in the PCM harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Turn the ignition on. (do not start or crank the engine)
Observe the lab scope screen.
Look for any pulses generated by the Crankshaft Position (CKP) Sensor.
Did the CKP Sensor generate any pulses?
All
Yes ! Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 3
3 Turn the ignition off.
With the DRBIIIt lab scope probe and the Miller special tool #6801, backprobe the
CMP Signal circuit in the PCM harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Turn the ignition on. (do not start or crank the engine)
Observe the lab scope screen.
Look for any pulses generated by the CMP Sensor.
Did the CMP Sensor generate any pulses?
All
Yes ! Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 4
4 Turn the ignition off.
With the DRBIIIt lab scope probe and the Miller special tool #6801, backprobe the
CMP Signal circuit in the PCM harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Start the engine.
Observe the lab scope screen while wiggling the wiring harness and connectors.
Were there any irregularities in the lab scope pattern?
All
Yes ! Check the harness connectors carefully. If OK, replace the Camshaft
Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 5
139
TEST ACTION APPLICABILITY
5 WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRBIIIt
parameters related to the DTC while wiggling the wiring harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIIIt Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes ! Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Test Complete.
6 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 8 Volt Supply circuit in the CMP Sensor harness
connector.
Is the voltage between 7.5 and 8.5 volts?
All
Yes ! Go To 7
No ! Go To 15
7 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor Signal circuit in the CMP Sensor harness
connector.
Is the voltage between 4.5 and 5.0 volts?
All
Yes ! Go To 8
No ! Go To 10
8 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Sensor Ground circuit between the CMP Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 9
No ! Repair the Sensor Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
140
TEST ACTION APPLICABILITY
9 NOTE: Inspect the Camshaft sprocket for damage per the Service Information.
If a problem is found repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the CMP Sensor Signal circuit in the CMP Sensor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes ! Repair the CMP Sensor Signal circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 11
11 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the CMP Sensor Signal circuit between the CMP Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 12
No ! Repair the CMP Sensor Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
12 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor Signal circuit in the CMP Sensor harness
connector.
Is the voltage above 5.0 volts?
All
Yes ! Repair the CMP Sensor Signal circuit for a short to battery
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 13
13 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Measure the resistance between the CMP Sensor Signal circuit and the 8 Volt Supply
circuit in the CMP Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Repair the CMP Sensor Signal circuit shorted to the 8 Volt Supply
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 14
141TEST ACTION APPLICABILITY
14 If there are no possible causes remaining, view repair. All
Repair
Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
15 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 8 Volt Supply circuit in the CMP Sensor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes ! Repair the 8 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 16
16 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 8 Volt Supply circuit between the CMP Sensor harness
connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 17
No ! Repair the 8 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
17 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 8 Volt Supply circuit in the CMP Sensor harness
connector.
Is the voltage above 8.5 volts?
All
Yes ! Repair the 8 Volt Supply circuit for a short to battery voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 18
18 If there are no possible causes remaining, view repair. All
Repair
Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.