P0058
SYMPTOM
P0058-02 SENSOR 2/2 HEATER CIRCUIT HIGH
WHEN MONITORED
Battery voltage above 10.6 volts, ASD is powered up, and 02 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
- (K399) 02 2/2 HEATER CONTROL CIRCUIT OPEN
- (Z992) 02 2/2 HEATER GROUND CIRCUIT OPEN
- (K399) 02 2/2 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
- 02 SENSOR
- PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Scan Tool Testing and Procedures
DIAGNOSTIC TEST
1. 02 SENSOR HEATER OPERATION
Turn the ignition off.
Note: Wait a minimum of 8 minutes to allow the 02 Sensor to cool down before continuing the test. Allow the 02 Sensor voltage to stabilize at 5.0 volts.
Ignition on, engine not running. With a scan tool, actuate the 02 Heater Test. With the scan tool, monitor the 2/2 02 Sensor voltage for at least 2 minutes.
Does the 02 Sensor voltage stay above 4.5 volts?
Yes>> Go To 2
No>> Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5. Powertrain Verification Test - Ver 5
2. 02 HEATER ELEMENT Turn the ignition off.
Note: Allow the 02 Sensor to cool down to room temperature. Disconnect the 2/2 02 Sensor harness connector.
Measure the resistance across the 02 Sensor Heater element, between the 02 Heater Control terminal and the 02 Heater ground terminal in the component connector.
Note: 02 Heater Element resistance values should be measured at 70 °F (21.1 °C). The resistance value will vary with different temperature values.
Is the 02 Sensor Heater Element resistance between 2.0 and 30.0 ohms?
Yes>> Go To 3
No>> Replace the 02 Sensor. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
3. (K399) 02 2/2 HEATER CONTROL CIRCUIT
Ignition on, engine not running.
With a scan tool, actuate the 02 2/2 Heater Test with the Sensor harness connector still disconnected.
Using a 12-volt test light connected to ground, probe the (K399) 02 2/2 Heater Control circuit in the 02 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. (Z992) 02 HEATER GROUND CIRCUIT OPEN
Turn the ignition off. Measure the resistance between an engine ground and the (Z992) 02 2/2 Heater ground circuit in the 02 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes>> Replace the 02 Sensor. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Repair the open in the (Z992) 02 2/2 Heater ground circuit. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
5. (K399) 02 2/2 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K399) 02 Heater 2/2 Control circuit in the 02 Sensor harness connector.
Does the voltmeter indicate any voltage present?
Yes>> Repair the short to battery voltage in the (K399) 02 2/2 Heater Control circuit. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Go To 6
6. (K399) 02 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) 02 2/2 Heater Control circuit from the 02 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 (K399) 02 2/2 Heater Control circuit. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
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 (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Replace and program the Powertrain Control Module per Service Information. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.