Diagnostic Test

ACTIVE DTC
WARNING:
When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

NOTE:
If any ASD Relay DTCs have set along with any of the O2 SENSOR HEATER CIRCUIT HIGH DTCs, all of the ASD O2 Sensor Heater Feed circuits need to be checked for a short to battery voltage.
1. Start the engine and allow it to idle for at least 60 seconds.
2. With the scan tool, read the active DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
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 across the O2 Sensor 1/2 Heater element, between the O2 Sensor 1/2 Heater Control terminal and the Heater ground terminal at the O2 Sensor 1/2 (component side).
  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 1/2 Heater Element resistance between 2.0 and 30.0 Ohms?
  
  Yes
  - Go To 3
  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 .
CHECK THE (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (K299) O2 Sensor 1/2 Heater Control circuit in the O2 Sensor 1/2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the O2 Sensor 1/2 Heater Control circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
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 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.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .