Diagnostic Test

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, Clear DTCs in the Engine Control Module (ECM).
3. With the scan tool, actuate the Oxygen Sensor Heater.
4. Monitor the scan tool for at least two minutes.
5. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Of O2 Sensor Heater Control Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Oxygen Sensor harness connector.
3. Disconnect the Engine Control Module (ECM) harness connector.
4. Remove the ASD Relay from the PDC.
5. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.
6. Turn the ignition on.
7. Measure the voltage of the (K99) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K99) O2 1/1 Heater Control circuit for a short to voltage.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
  No
  - Go to step 3
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND

Fig 2: Measuring Resistance Between Ground And O2 Sensor Heater Control Circuit In Oxygen Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the jumper wire and install the ASD relay.
3. Measure the resistance between ground and the (K99) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.
  Is the resistance above 1000 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (K99) O2 1/1 Heater Control circuit for a short to ground.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Measuring Resistance Of O2 Sensor Heater Control Circuit Between Oxygen Sensor Harness Connector And Engine Control Module (ECM) Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K99) O2 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the Engine Control Module (ECM) harness connector.
  Is the resistance below 10.0 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (K99) O2 1/1 Heater Control circuit for an open circuit or high resistance.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
(A15) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Measuring Resistance Of Fused ASD Relay Output Circuit Between Oxygen Sensor Harness Connector And ASD Relay Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (A15) Fused ASD Relay Output circuit between the Oxygen Sensor harness connector and the ASD Relay connector.
  Is the resistance below 10.0 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the (A15) Fused ASD Relay Output circuit for an open circuit or high resistance.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
OXYGEN SENSOR
1. Turn the ignition off.
2. Connect the Engine Control Module (ECM) harness connector.
3. Replace the Oxygen Sensor in accordance with the Service Information.
4. Start the engine.
5. Allow the engine to reach normal operating temperature.
6. Monitor the scan tool for at least two minutes.
7. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 7
  No
  - Test Complete.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
ENGINE CONTROL MODULE (ECM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Engine Control Module (ECM).
- Look for any chafed, pierced, pinched, or partially broken wires.
- Look for broken, bent, pushed out or corroded terminals.
- Check for any Technical Service Bulletins that may apply.