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: If the P0107 - MAP Sensor Voltage Too Low is also set, diagnose it first before continuing with P1296 - No 5-volts To MAP Sensor.

Ignition on, engine not running.
With the DRBIII®, read DTCs and record the related Freeze Frame data.

Check for any related TSBs.

With the DRBIII® in Sensors, read the MAP Sensor voltage.

Is the voltage below 2.35 volts?
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 (K7) 5-volt Supply circuit at the MAP Sensor harness connector.

Is the voltage above 4.5 volts?
1. Yes --> Go To 3
2. No --> Go To 4
With the DRBIII® in Sensors, read the MAP Sensor voltage with the Sensor harness connector disconnected.
Is the voltage above 4.5 volts?
1. Yes --> Replace the MAP Sensor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 7
Measure the voltage on the (K7) 5-volt Supply circuit in the MAP Sensor harness connector while disconnecting the remaining Sensors that share the (K7) 5-volt Supply circuit.
Does the voltage return to approximately 5.0 volts with any Sensor disconnected?
1. Yes --> Replace the Sensor that pulled the (K7) 5-volt Supply circuit low.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5
Turn the ignition off.
Disconnect the PCM harness connectors.

Measure the resistance of the (K7) 5-volt Supply circuit from the MAP Sensor harness connector to the PCM harness connector.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 6
2. No --> Repair the excessive resistance in the (K7) 5-volt Supply circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Turn the ignition off.
Disconnect the MAP Sensor harness connector.

Disconnect the PCM harness connectors.

Measure the resistance between ground and the (K7) 5-volt Supply circuit in the MAP Sensor harness connector.

Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K7) 5-volt Supply circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 7

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.
  2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .