Dodge Durango (HB). Manual — part 799
P0151-O2 SENSOR 2/1 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 2/1 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
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 195
P0151-O2 SENSOR 2/1 CIRCUIT LOW (CONTINUED)
5.
(K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Measure the resistance between ground and the (K43) O2 2/1 Signal
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K43) O2 2/1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO THE (K902) O2 RETURN UPSTREAM CIRCUIT
Measure the resistance between the (K43) O2 2/1 Signal circuit and
the (K902) O2 Return Upstream circuit in the O2 Sensor harness con-
nector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K902) O2 Return Upstream
circuit and the (K43) O2 2/1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
9 - 196
ENGINE ELECTRICAL DIAGNOSTICS
HB
P0151-O2 SENSOR 2/1 CIRCUIT LOW (CONTINUED)
7.
(K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO THE (Z934) HEATER GROUND CIRCUIT
Measure the resistance between the (K43) O2 2/1 Signal circuit and
the (Z934) O2 Heater ground circuit in the O2 Sensor harness con-
nector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (Z934) O2 Heater ground
circuit and the (K43) O2 2/1 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)
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 197
P0152-O2 SENSOR 2/1 CIRCUIT HIGH
9 - 198
ENGINE ELECTRICAL DIAGNOSTICS
HB
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