Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

NOTE: Record the Freeze Frame Information that set along with the DTC.

Check for any related TSBs.
Ignition on, engine not running.

With the DRBIII®, read DTCs and record the related Freeze Frame data.

Is the Good Trip Counter displayed and equal to zero?
1. Yes --> Go To 2
2. No --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .

NOTE: (K73) is the Knock Sensor No. 1 Signal circuit and (K74) is the Knock Sensor No. 2 Signal circuit.

Turn the ignition off.
Disconnect the Knock Sensor harness connector.

Disconnect the PCM harness connectors.

Ignition on, engine not running.

Measure the voltage on the (K73) or (K74) Knock Sensor Signal circuit in the Knock Sensor harness connector.

Is the voltage above 2.0 volts?
1. Yes --> Repair the short to voltage in the (K73) or (K74) Knock Sensor Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 3
Turn the ignition off.
Measure the resistance of the (K73) or (K74) Knock Sensor Signal circuit from the Knock Sensor harness connector to the PCM harness connector.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 4
2. No --> Repair the open in the (K73) or (K74) Knock Sensor Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the appropriate Knock Sensor Signal circuit.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K73) or (K74) Knock Sensor Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5
Measure the resistance between the (K73) or (K74) Knock Sensor Signal circuit and the (K4) Sensor ground circuit in the Knock Sensor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short between the (K73) or (K74) Knock Sensor Signal circuit and the (K4) Sensor ground circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 6
Measure the resistance of the (K4) Sensor ground circuit from the Knock Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
1. Yes --> Go To 7
2. No --> Repair the open in the (K4) Sensor ground circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Connect the PCM harness connectors.
Replace the Knock Sensor.

Ignition on, engine not running.

With the DRBIII®, erase DTC.

Attempt to operate the vehicle within the operating range of the information in Freeze Frame.

With the DRBIII®, read DTC's.

Does the Knock Sensor DTC return?
1. Yes -->
  NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module per Service Information.
  
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Test Complete.