Minimum fuel pressure
Thread Starter
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Professional
Joined: Jan 2015
Posts: 165
Likes: 1
1.5 V while at idle. The voltage went up to 2..0 V for about 2 seconds an then went down below the orginal 1.5V. So it seems the sensor was not the issue being that i get practically the same numbers with the new sensor not to mention still have the same codes come up...
Grand Champion
Joined: Feb 2015
Posts: 7,435
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Codes are for the heater circuit, The 138 may be because of the first two.
P0141 O2 Sensor 1/2 Heater Failure
P0135 O2 Sensor 1/1 Heater Failure
P0138 O2 Sensor 1/2 Circuit Voltage High
.
How are you getting 27 volts from a 12 volt system? Negative test lead to ground, positive test lead to heater lead. You should have the engine running, Reason: If you leave the ignition on(key on) after a few seconds the PCM will shut off the ASD relay and you will loose power. If you have the test leads hooked up then turn the key on you get the reading. If you don't know what lead is what look in the service manual here. You can remove the 02 sensor plug you are only testing for power.
P0141 O2 Sensor 1/2 Heater Failure
P0135 O2 Sensor 1/1 Heater Failure
P0138 O2 Sensor 1/2 Circuit Voltage High
o2 sensor at the cat key on voltage
+26.7
-11.97
6.6 ohms (new sensor)
o2 sensor in rear key on voltage
+27.2
-11.66
5.0 ohms (old sensor)
+26.7
-11.97
6.6 ohms (new sensor)
o2 sensor in rear key on voltage
+27.2
-11.66
5.0 ohms (old sensor)
How are you getting 27 volts from a 12 volt system? Negative test lead to ground, positive test lead to heater lead. You should have the engine running, Reason: If you leave the ignition on(key on) after a few seconds the PCM will shut off the ASD relay and you will loose power. If you have the test leads hooked up then turn the key on you get the reading. If you don't know what lead is what look in the service manual here. You can remove the 02 sensor plug you are only testing for power.
Thread Starter
|
Professional
Joined: Jan 2015
Posts: 165
Likes: 1
Codes are for the heater circuit, The 138 may be because of the first two.
P0141 O2 Sensor 1/2 Heater Failure
P0135 O2 Sensor 1/1 Heater Failure
P0138 O2 Sensor 1/2 Circuit Voltage High
.
How are you getting 27 volts from a 12 volt system? Negative test lead to ground, positive test lead to heater lead. You should have the engine running, Reason: If you leave the ignition on(key on) after a few seconds the PCM will shut off the ASD relay and you will loose power. If you have the test leads hooked up then turn the key on you get the reading. If you don't know what lead is what look in the service manual here. You can remove the 02 sensor plug you are only testing for power.
P0141 O2 Sensor 1/2 Heater Failure
P0135 O2 Sensor 1/1 Heater Failure
P0138 O2 Sensor 1/2 Circuit Voltage High
.
How are you getting 27 volts from a 12 volt system? Negative test lead to ground, positive test lead to heater lead. You should have the engine running, Reason: If you leave the ignition on(key on) after a few seconds the PCM will shut off the ASD relay and you will loose power. If you have the test leads hooked up then turn the key on you get the reading. If you don't know what lead is what look in the service manual here. You can remove the 02 sensor plug you are only testing for power.
did anyone have a chance to review the video of live data on O2 sensors? I feel like when the truck started to run terrible the upstream o2 lost all voltage an the downstream didnt change voltage at all.