Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the engine.
2. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
3. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (K42) KNOCK SENSOR 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Knock Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (K42) Knock Sensor 1 Signal circuit in the Knock Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Repair the short to voltage in the (K42) Knock Sensor 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K42) KNOCK SENSOR 1 SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
3. Connect the adapter.
  (special tool #10436, Adapter, GPEC Diagnostic)
4. Measure the resistance of the (K42) Knock Sensor 1 Signal circuit from the Knock Sensor harness connector to the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (K42) Knock Sensor 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K942) KNOCK SENSOR 1 RETURN CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K942) Knock Sensor 1 Return circuit from the Knock Sensor harness connector to the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (K942) Knock Sensor 1 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR THE (K42) KNOCK SENSOR 1 SIGNAL CIRCUIT SHORTED TO THE (K942) KNOCK SENSOR 1 RETURN CIRCUIT
1. Measure the resistance between the (K42) Knock Sensor No. 1 Signal circuit and the (K942) Knock Sensor 1 Return circuit in the Knock Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the short between the (K42) Knock Sensor 1 Signal circuit and the (K942) Knock Sensor 1 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K42) KNOCK SENSOR 1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K42) Knock Sensor 1 Signal circuit in the Knock Sensor harness connector.
  Is there continuity between ground and the (K42) Knock Sensor 1 Signal circuit?
  
  Yes
  - Repair the (K42) Knock Sensor 1 Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
KNOCK SENSOR 1
1. Turn the ignition off.
2. Verify that there is good pin to terminal contact at the Knock Sensor and the Powertrain Control Module harness connector.
3. If no problems were found in the connectors, replace the Knock Sensor 1. Refer to SENSOR, KNOCK, REMOVAL .
4. Connect the Powertrain Control Module (PCM) harness connector.
5. Turn the ignition on.
6. With the scan tool, erase DTCs.
7. Start the engine and allow it to reach normal operating temperature.
  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:
  It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset.
8. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 8
  No
  - Test complete.
  - 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 Knock Sensor 1 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. Perform any Service Bulletins that may apply.
  Were 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 (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .