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*CHECKING THE FUEL DELIVERY SYSTEM (CONTINUED) 3. RESTRICTED FUEL SUPPLY LINE Turn the ignition off. WARNING: The fuel system is under a constant pressure even with the engine off. Before testing or ser- Install special tool #6539 (5/16 9 ) or #6631(3/8 9 ) fuel line adapter and the fuel pressure gauge between the fuel sup- ply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). CAUTION: Stop All Actuations. Is the fuel pressure within specification now? Yes >> Repair/replace fuel supply line as necessary. Perform the POWERTRAIN VERIFICATION TEST.. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. CHECKING FUEL INLET STRAINER Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- Is the Fuel Inlet Strainer plugged? Yes >> Replace the Fuel Pump Inlet Strainer. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Replace the Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 5. (N1) FUEL PUMP RELAY OUTPUT CIRCUIT OPEN Turn the ignition off. Remove the Fuel Pump Relay from the IPM. Disconnect the Fuel Pump Module harness connector. Measure the resistance of the (N1) Fuel Pump Relay Output circuit from the relay connector to the fuel pump mod- Is the resistance below 5.0 ohms? Yes >> Replace the Fuel Pump Relay. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Repair the open in the (N1) Fuel Pump Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 1039 |