Diagnostics Procedures

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.

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

Ignition on, engine not running.

Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

Is the voltage between 4.5 to 5.2 volts?
1. Yes --> Go To 3
2. No --> Go To 6
With the DRBIII®, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.
Is the voltage above 4.8 volts?
1. Yes --> Replace the MAP Sensor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 4
Turn the ignition off.
Disconnect the PCM harness connectors.

CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WELL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 5
2. No --> Repair the open in the (K1) MAP Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the (K1) MAP Signal circuit at the MAP Sensor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K1) MAP Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 9
Turn the ignition off.
Disconnect the PCM harness connectors.

Ignition on, engine not running.

Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

Is the voltage above 5.2 volts?
1. Yes --> Repair the short to voltage in the (F856) 5-volt Supply circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 7

CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WELL DAMAGE THE PCM TERMINALS RESULTING EST POOR TERMINAL TO PEST CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Turn the ignition off.
Measure the resistance of the (F856) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 8
2. No --> Repair the open in the (F856) 5-volt Supply circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the (F856) 5-volt Supply circuit at the MAP Sensor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (F856) 5-volt Supply circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 9

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
1. Repair
  1. Replace and program the Powertrain Control Module per Service Information.
    Perform POWERTRAIN VERIFICATION TEST VER - 5 .