P0052-O2 SENSOR 2/1 HEATER CIRCUIT HIGH
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 |
| (K199) O2 2/1 HEATER CONTROL CIRCUIT OPEN |
| (Z42) O2 2/1 HEATER GROUND CIRCUIT OPEN |
| (K199) O2 2/1 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 DTCIgnition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
- Perform the 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 2/1 O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element, between the O2 Heater Control terminal and the Heater ground terminal at the component connector.
NOTE: O2 Heater Element resistance values should be measured at 70°F (21.1°C). The resistance value will vary with different temperature 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 the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3. (K199) O2 2/1 HEATER CONTROL CIRCUIT
Ignition on, engine not running.
With the scan tool, actuate the O2 Heater Test with the Sensor harness connector still disconnected.
Using a 12-volt test light connected to ground, probe the (K199) O2 2/1 Heater Control circuit in the O2 Sensor harness connector.
Does the test light illuminate brightly and flash on and off during the actuation?
Yes
- Go To 4
No
- Go To 5
4. (Z42) O2 2/1 HEATER GROUND CIRCUIT OPEN
Turn the ignition off.
Measure the resistance between an engine ground and the (Z42) O2 2/1 Heater ground circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
- Replace the O2 Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Repair the open in the (Z42) O2 2/1 Heater ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5. (K199) O2 2/1 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (K199) O2 2/1 Heater Control circuit in the O2 Sensor harness connector.
Does the test light illuminate?
Yes
- Repair the short to battery voltage in the (K199) O2 2/1 Heater Control circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 6
6. (K199) O2 2/1 HEATER CONTROL CIRCUIT OPEN
Turn the ignition off.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Measure the resistance of the (K199) O2 2/1 Heater Control circuit from the O2 Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
- Go To 7
No
- Repair the open in the (K199) O2 2/1 Heater Control circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
7. 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)