Diagnostic Test

1) DTC IS ACTIVE
Ignition on, engine not running.

With the scan tool, Clear DTCs in the Engine Control Module (ECM).

With the scan tool, actuate the Oxygen Sensor Heater.

Monitor the scan tool for at least two minutes.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. Go to step 2).
No
1. Refer to *CHECKING FOR AN INTERMITTENT CONDITION .
2) (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking O2 1/1 Heater Control Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Oxygen Sensor harness connector.

Disconnect the Engine Control Module (ECM) harness connector.

Remove the ASD Relay from the PDC.

Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.

Turn the ignition on.

Measure the voltage of the (K99) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.

Is there any voltage present?

Yes
1. Repair the (K99) O2 1/1 Heater Control circuit for a short to voltage.
2. Perform ECM VERIFICATION TEST .
No
1. Go to step 3).
3) (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND

Fig 2: Checking O2 1/1 Heater Control Circuit Short To Ground
Courtesy of CHRYSLER LLC

Turn the ignition off.

Remove the jumper wire and install the ASD relay.

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
1. Go to step 4).
No
1. Repair the (K99) O2 1/1 Heater Control circuit for a short to ground.
2. Perform ECM VERIFICATION TEST .
4) (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking O2 1/1 Heater Control Circuit Open Or High Resistance
Courtesy of CHRYSLER LLC

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
1. Go to step 5).
No
1. Repair the (K99) O2 1/1 Heater Control circuit for an open circuit or high resistance.
2. Perform ECM VERIFICATION TEST .
5) (A15) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking Fused ASD Relay Output Circuit Open Or High Resistance
Courtesy of CHRYSLER LLC

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
1. Go to step 6).
No
1. Repair the (A15) Fused ASD Relay Output circuit for an open circuit or high resistance.
2. Perform ECM VERIFICATION TEST .
6) OXYGEN SENSOR
Turn the ignition off.

Connect the Engine Control Module (ECM) harness connector.

Replace the Oxygen Sensor in accordance with the Service Information.

Start the engine.

Allow the engine to reach normal operating temperature.

Monitor the scan tool for at least two minutes.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. Go to step 7).
No
1. Test Complete.
2. Perform ECM VERIFICATION TEST .
7) ENGINE CONTROL MODULE (ECM)
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.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform ECM VERIFICATION TEST .
No
1. Replace the Engine Control Module (ECM) in accordance with the Service Information.
2. Perform ECM VERIFICATION TEST .