Diagnostic Test

O2 SENSOR HEATER ELEMENT
1. Turn the ignition off.
  NOTE:
  Allow the O2 Sensor to cool down to room temperature.
2. Disconnect the O2 Sensor 1/2 harness connector.
3. Measure the resistance of the O2 Sensor Heater Element across the O2 Sensor connector (component side) between the (K299) O2 Sensor Heater Control terminal and the (F344) Fused ASD Relay Output terminal.
  NOTE:
  The O2 Sensor Heater Element resistance values should be measured at 21.1°C (70°F). The resistance value will vary with different temperature values.
  
  Is the resistance of the O2 Sensor Heater Element between 2.0 and 30.0 Ohms?
  
  Yes
  - Go To 2
  No
  - Verify that there is good pin to terminal contact in the O2 Sensor 1/2 and Powertrain Control Module connectors. If OK, replace the O2 Sensor. Refer to SENSOR, OXYGEN, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ACTIVE DTC
1. Turn the ignition off.
2. Reconnect the O2 Sensor 1/2 harness connector.
  NOTE:
  Wait a minimum of eight minutes to allow the O2 Sensor to cool down before continuing the test.
3. Start the engine and allow it to run for at least five minutes.
4. With the scan tool, view DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the O2 Sensor 1/2 harness connector.
3. Disconnect the PCM C1 harness connector.
4. Measure the resistance of the (K299) O2 Sensor 1/2 Heater Control circuit between the O2 Sensor 1/2 harness connector and the PCM C1 harness connector.
  Is the resistance below 0.5 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the excessive resistance in the O2 1/2 Heater Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(F344) FUSED ASD RELAY OUTPUT CIRCUIT OPEN
1. Remove the ASD Relay.
2. Measure the resistance of the (F344) Fused ASD Relay Output circuit between the ASD Relay Output terminal and the O2 Sensor 1/2 harness connector.
  Is the resistance below 0.5 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (F344) Fused ASD Relay Output circuit for an open circuit or short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/2 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. Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module harness connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .