P0057
P0057-O2 SENSOR 2/2 HEATER RESISTANCE
For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.
- When Monitored:
Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is on.
- Set Condition:
Desired state does not match Actual state. Two Trip Fault. Three good trips to turn off the MIL.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
1. O2 SENSOR HEATER OPERATION
1. Turn the ignition off.
NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts.
2. Ignition on, engine not running.
3. With a scan tool, actuate the O2 Heater Test.
NOTE: The DTC needs to be cleared before actuating the Heater Test, if the DTC is not cleared, the Heater Test may not be allowed to actuate.
4. With the scan tool, monitor 2/2 O2 Sensor voltage for at least 2 minutes.
Does the O2 Sensor voltage stay above 4.5 volts?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Checking for an Intermittent DTC.
2. O2 HEATER ELEMENT
1. Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down to room temperature.
2. Disconnect the 2/2 O2 Sensor harness connector.
3. 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° C (70° 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
- Go To 3
No
- Replace the O2 Sensor.
- Perform the PCM Verification Test.PCM Verification Test
3. O2 SENSOR
1. Ignition on, engine not running.
2. With a scan tool, actuate the O2 Heater Test with the O2 Sensor harness connector still disconnected.
NOTE: The DTC needs to be cleared before actuating the Heater Test, if the DTC is not cleared, the Heater Test may not be allowed to actuate.
3. Using a 12-volt test light connected to 12-volts, probe the (K399) O2 2/2 Heater Control circuit in the O2 Sensor harness connector.
Does the test light illuminate brightly and flash on and off during the actuation?
Yes
- Replace the O2 Sensor.
- Perform the PCM Verification Test.PCM Verification Test
No
- Go To 4
4. (K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Disconnect the C1 PCM harness connector.
3. Measure the resistance between ground and the (K399) O2 2/2 Heater Control circuit in the O2 Sensor harness connector.
Is the resistance below 20 kOhms?
Yes
- Repair the short to ground in the (K399) O2 2/2 Sensor Heater Control circuit.
- Perform the PCM Verification Test.PCM Verification Test
No
- Go To 5
5. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Verify that there is good pin to terminal contact in the Oxygen Sensor and Powertrain Control Module connectors.
5. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
6. Look for the data to change or for a DTC to set during the wiggle test.
7. Search for any Technical Service Bulletins that may apply.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test.PCM Verification Test
No
- Replace and program the Powertrain Control Module.
- Perform the PCM Verification Test.PCM Verification Test