P0058-O2 SENSOR 2/2 HEATER CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN
(Z906) O2 2/2 HEATER GROUND CIRCUIT OPEN
(K399) O2 2/2 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, select View DTCs.

Is the DTC Active at this time?

Yes


No

2. O2 HEATER ELEMENT

Turn the ignition off.

NOTE: Allow the O2 Sensor to cool down to room temperature.


Disconnect the 2/2 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 in the component connector.

NOTE: O2 Heater Element resistance values should be measured at 21.1 degrees C (70 degrees F). The resistance value will vary with different temperature values.



Is the O2 Sensor Heater Element resistance between 2.0 and 30.0 ohms?

Yes


No

3. (K399) O2 2/2 HEATER CONTROL CIRCUIT



Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (K399) O2 2/2 Heater Control circuit in the O2 Sensor harness connector.

NOTE: Make sure the test light is probing the circuit before actuating the Heater Test or a DTC may set and not allow the actuation.


With a scan tool, actuate the O2 2/2 Heater Test with the Sensor harness connector still disconnected.

Does the test light illuminate brightly and flash on and off during the actuation?

Yes


No

4. (Z906) O2 HEATER GROUND CIRCUIT OPEN



Turn the ignition off.
Measure the resistance between an engine ground and the (Z906) O2 2/2 Heater ground circuit in the O2 Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes


No

5. (K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE



Turn the ignition off.
Disconnect the C3 PCM harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (K399) O2 Heater 2/2 Control circuit in the O2 Sensor harness connector.

Does the test light illuminate?

Yes


No

6. (K399) O2 2/2 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 (K399) O2 2/2 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


No

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


No