Diagnostic Test

1) FUEL PUMP OPERATION
Ignition on, engine not running.

With a scan tool under the PCM Actuators, actuate the Fuel Pump.

Is the Fuel Pump operating?

Yes
1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
No
1. Go To 2).
2) FUEL PUMP CONTROL OPERATION FROM THE PCM
Turn the ignition off.

Disconnect the TIPM C2 harness connector.

Ignition on, engine not running.

Using the scan tool under the PCM Actuators, actuate the Fuel Pump.

With a 12-volt test light connected to ground, probe the (K31) Fuel Pump Control circuit in the TIPM C2 harness connector.

Does the test light illuminate brightly and flash on an off?

Yes
1. Go To 3).
No
1. Perform the Diagnostic Procedure for P0627-FUEL PUMP CONTROL CIRCUIT. (Refer to ENGINE - DIAGNOSIS AND TESTING -DIAGNOSTIC CODE INDEX) .
3) (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 1: MEASURING FOR VOLTAGE AT THE FUEL PUMP CONTROL OUTPUT CIRCUIT
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off

Disconnect the C7 TIPM harness connector.

Disconnect the Fuel Pump Module harness connector.

Turn the ignition on.

Using a voltmeter, measure the voltage of the (N1) Fuel Pump Control Output circuit in the Fuel Pump Module harness connector.

Does the voltmeter indicate voltage present?

Yes
1. Repair the short to battery voltage in the (N1) Fuel Pump Control Output circuit.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
No
1. Go To 4).
4) FUEL PUMP MOTOR GROUND CIRCUIT

Fig 2: CHECKING FUEL PUMP MOTOR GROUND CIRCUIT
Courtesy of DAIMLERCHRYSLER CORP.

Using a 12-volt test light to battery voltage, probe the Fuel Pump Motor Ground circuit in the Fuel Pump Module harness connector.

Does the test light illuminate brightly.

Yes
1. Go To 5).
No
1. Repair the Fuel Pump Motor Ground circuit.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
5) FUEL PUMP MODULE

Fig 3: Checking Fuel Pump Control Output Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect the C2 and C7 TIPM harness connectors.

Ignition on, engine not running.

Using the scan tool under the TIPM Actuators, actuate the Fuel Pump.

With a 12-volt test light connected to ground, probe the (N1) Fuel Pump Control Output circuit at the Fuel Pump Module harness connector.

Does the test light illuminate brightly and flash on and off?

Yes
1. Replace the Fuel Pump Module in accordance with the Service Information.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
No
1. Go To 6).
6) TOTALLY INTEGRATED POWER MODULE
NOTE: Before continuing, check the TIPM 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.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
No
1. Replace the Totally Integrated Power Module per Service Information.
2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .