Dodge Durango (HB). Manual — part 803
P0157-O2 SENSOR 2/2 CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (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 10.99 volts.
•
Set Condition:
The oxygen sensor signal voltage is below 2.5196 volts for 3 seconds after starting engine. One Trip Fault.
Three good trips to turn off the MIL.
Possible Causes
(K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO GROUND
(K243) O2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 RETURN DOWNSTREAM CIRCUIT
(K243) O2 SIGNAL CIRCUIT SHORTED TO THE (Z992) O2 2/2 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 2/2 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.
(K243) O2 2/2 SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the 2/2 O2 Sensor harness connector.
Ignition on, engine not running.
With a scan tool, monitor the 2/2 O2 Sensor voltage.
Is the O2 Sensor voltage above 4.8 volts?
Yes
>> Go To 3
No
>> Go To 5
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 211
P0157-O2 SENSOR 2/2 CIRCUIT LOW (CONTINUED)
3.
O2 SENSOR
Measure the voltage on the (K904) O2 Return Downstream 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.
(K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K904) O2 Return
Downstream circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K904) O2 Return Down-
stream circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
9 - 212
ENGINE ELECTRICAL DIAGNOSTICS
HB
P0157-O2 SENSOR 2/2 CIRCUIT LOW (CONTINUED)
5.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1and C2 PCM harness connectors.
Measure the resistance between ground and the (K243) O2 2/2 Signal
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K243) O2 2/2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 RETURN DOWNSTREAM CIRCUIT
Measure the resistance between the (K243) O2 2/2 Signal circuit and
the (K904) O2 Return Downstream circuit in the O2 Sensor harness
connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K904) O2 Return Down-
stream circuit and the (K243) O2 2/2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 213
P0157-O2 SENSOR 2/2 CIRCUIT LOW (CONTINUED)
7.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO THE (Z992) O2 2/2 HEATER GROUND CIRCUIT
Measure the resistance between the (K243) O2 2/2 Signal circuit and
the (Z992) O2 2/2 Heater ground circuit in the O2 Sensor harness
connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (Z992) O2 2/2 Heater
ground circuit and the (K243) O2 2/2 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)
9 - 214
ENGINE ELECTRICAL DIAGNOSTICS
HB
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