Dodge Dakota (ND). Manual — part 619
P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW (CONTINUED)
3.
O2 SENSOR
Ignition on, engine not running.
With a scan tool, actuate the O2 1/1Heater Test with the O2 Sensor
harness connector still disconnected.
Using a 12-volt test light connected to ground, probe the (K99) O2 1/1
Heater Control circuit in the O2 Sensor harness connector.
Does the test light illuminate brightly and flash on and off dur-
ing the actuation?
Yes
>> Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K99) O2 1/1 Heater
Control circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to ground in the (K99) O2 1/1 Heater
Control circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
9 - 14
ENGINE ELECTRICAL DIAGNOSTICS
ND
P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW (CONTINUED)
5.
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)
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 15
P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH
9 - 16
ENGINE ELECTRICAL DIAGNOSTICS
ND
P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is off.
•
Set Condition:
Desired state does not equal Actual state. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN
(Z43) O2 1/1 HEATER GROUND CIRCUIT OPEN
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
O2 SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTC’s.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
O2 HEATER ELEMENT
Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down to room temperature.
Disconnect the 1/1 O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element
between the O2 Heater Control terminal and the O2 Heater ground
terminal at the component.
NOTE: O2 Heater Element resistance values should be measured
at 70°F (21.1°C). The resistance value will vary with different tem-
perature values.
Is the O2 Sensor Heater Element resistance between 2.0 and
30.0 ohms?
Yes
>> Go To 3
No
>> Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 17
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