Dodge Dakota (ND). Manual — part 654
P0137-O2 SENSOR 1/2 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 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 POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
9 - 154
ENGINE ELECTRICAL DIAGNOSTICS
ND
P0137-O2 SENSOR 1/2 CIRCUIT LOW (CONTINUED)
5.
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Measure the resistance between ground and the (K141) O2 1/2 Signal
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K141) O2 1/2 Signal cir-
cuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 RETURN DOWNSTREAM CIRCUIT
Measure the resistance between the (K141) O2 1/2 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 (K141) O2 1/2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 155
P0137-O2 SENSOR 1/2 CIRCUIT LOW (CONTINUED)
7.
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (Z42) O2 1/2 HEATER GROUND CIRCUIT
Measure the resistance between the (K141) O2 1/2 Signal circuit and
the (Z42) O2 1/2 Heater ground circuit in the O2 Sensor harness con-
nector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (Z42) O2 1/2 Heater ground
circuit and the (K141) O2 1/2 Signal circuit.
Perform 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 POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 156
ENGINE ELECTRICAL DIAGNOSTICS
ND
P0138-O2 SENSOR 1/2 CIRCUIT HIGH
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 157
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