Jeep Grand Cherokee WK. Manual — part 890
P0131-O2 SENSOR 1/1 CIRCUIT LOW (CONTINUED)
For the Engine circuit diagrams (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Engine running for less than 30 seconds and the O2 Sensor Heater Temperature is less than 251°C (484°F)
with battery voltage greater 10.4 volts.
•
Set Condition:
The oxygen sensor signal voltage is below 2.5196 volts for 6 seconds after starting engine. One Trip Fault.
Three good trips to turn off the MIL.
Possible Causes
(K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND
(K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO GROUND
(K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO THE (K902) O2 RETURN UPSTREAM CIRCUIT
(K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO THE (Z42) O2 1/1 HEATER GROUND CIRCUIT
O2 SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
O2 SENSOR BELOW 2.52 VOLTS
Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, read the 1/1 O2 Sensor voltage.
Is the voltage below 2.52 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the 1/1 O2 Sensor harness connector.
Ignition on, engine not running.
With a scan tool, monitor the O2 Sensor voltage.
Is the 1/1 O2 Sensor voltage above 4.8 volts?
Yes
>> Go To 3
No
>> Go To 5
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0131-O2 SENSOR 1/1 CIRCUIT LOW (CONTINUED)
3.
O2 SENSOR
Measure the voltage on the (K902) O2 Return Upstream circuit in the
O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 PCM harness connector.
Measure the resistance between ground and the (K902) O2 Return
Upstream circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K902) O2 Return
Upstream circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
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P0131-O2 SENSOR 1/1 CIRCUIT LOW (CONTINUED)
5.
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Measure the resistance between ground and the (K41) O2 Sensor 1/1
Signal circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K41) O2 Sensor 1/1 Sig-
nal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO THE (K902) O2 RETURN UPSTREAM CIRCUIT
Measure the resistance between the (K41) O2 Sensor 1/1 Signal cir-
cuit and the (K902) O2 Return Upstream circuit in the O2 Sensor har-
ness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K902) O2 Return Upstream
circuit and the (K41) O2 Sensor 1/1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
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ENGINE ELECTRICAL DIAGNOSTICS
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P0131-O2 SENSOR 1/1 CIRCUIT LOW (CONTINUED)
7.
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO THE (Z42) O2 1/1 HEATER GROUND CIRCUIT
Measure the resistance between the (K41) O2 Sensor 1/1 Signal cir-
cuit and the (Z42) O2 1/1 Heater ground circuit in the O2 Sensor har-
ness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (Z42) O2 1/1 Heater ground
circuit and the (K41) O2 Sensor 1/1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 159
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