DTC P0253: FUEL INJECTION PUMP FUEL VALVE OPEN CIRCUIT

Monitor & Set Conditions

Fuel injection pump fuel valve open circuit is monitored when the ignition is on. DTC may be stored when Engine Control Module (ECM) senses engine speed is greater than 100 RPM and low current or no current is detected at fuel metering valve.

Possible Causes

• Wiring Connector Problem
• Other DTCs
• Battery Voltage Below 12 Volts
• Ground Circuit Open
• Fuel Injection Pump Relay Output Circuit Open
• Battery Voltage Less Than 8 Volts
• Fuel Injection Pump

Testing

1. Turn ignition on with engine off. Using DRBIII(R) scan tool, check for DTCs. If the STARTS SINCE SET counter for DTC P0253 is not equal to zero, go to next step. If the STARTS SINCE SET counter for DTC P0253 is equal to zero, go to step 4.

2. Turn ignition off. Inspect wiring harness and connectors between Fuel Pump Control Module (FPCM) and ECM, and between fuel pump relay and FPCM. FPCM is located on top of fuel injection pump. FPCM is incorporated into fuel injection pump and may also be referred to as the fuel injection pump when referencing to the wiring diagram. ECM is located on driver's side of the engine, just in front of fuel transfer pump and contains a 50-pin connector. Fuel pump relay is located in PDC at driver's side front corner of engine compartment. Fuel injection pump relay may also be referred to as fuel pump relay. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary.

3. Turn ignition on with engine off. Using scan tool, read FREEZE FRAME data. Operate vehicle within FREEZE FRAME data parameters while wiggling wiring harness and connectors between FPCM and ECM and between fuel pump relay and FPCM. If the STARTS SINCE SET counter for DTC P0253 changes to zero, go to next step. If the STARTS SINCE SET counter for DTC P0253 counter does not change to zero, the test is complete.

4. Ensure ignition is on with engine off. Using scan tool, check for DTCs. If DTC P0215 does not exist, go to next step. If DTC P0215 exists, perform DTC P0215: FUEL INJECTION PUMP CONTROL CIRCUIT test.

5. Turn ignition off. Using DVOM, measure voltage between battery terminals. If the voltage is 12 volts or greater, go to next step. If the voltage is less than 12 volts, recharge or replace the battery as necessary.

6. Ensure ignition is off. Disconnect Fuel Pump Control Module (FPCM) harness connector. FPCM harness connector is located on the end of fuel injection pump. FPCM is incorporated into fuel injection pump and may also be referred to as the fuel injection pump when referencing to the wiring diagram. Connect a test light between battery voltage and terminal No. 6 (Black/Tan wire) on FPCM harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance on Black/Tan wire between FPCM, ECM, and ground. ECM is located on driver's side of the engine, just in front of fuel transfer pump and contains a 50-pin connector.

7. Ensure FPCM connector is still disconnected. Turn ignition on with engine off. Connect a test light between ground and terminal No. 7 (Red/Light Green wire) on FPCM harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance on Red/Light Green wire between FPCM connector and cavity No. 87 in PDC for fuel pump relay.

8. Perform starter draw test with starter installed. Starter draw should be 450-700 amps. If starter draw is not within specification, repair or replace the starter. If starter draw is within specification, using DVOM, measure voltage between battery terminals while cranking the engine. If the voltage is 8 volts or greater, replace fuel injection pump. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If the voltage is less than 8 volts, recharge or replace the battery as necessary.