DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 173 / 284

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Inspect the entire fuel system for leakage.
Is there any evidence of leakage? All
Yes
→
Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 4
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect all of the Fuel Injector harness connectors.
Measure the resistance between ground and each of the Fuel Injector Control
circuits.
Is the resistance below 1000 ohms for any of the measurements? All
Yes
→
Repair the appropriate Fuel Injector Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 5
5 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect all of the Fuel Injector harness connectors.
Measure the resistance of the Common Injector Driver circuit between the ECM
harness connector and each Fuel Injector harness connector.
Is the resistance below 10.0 ohms for each measurement? All
Yes
→
Go To 6
No
→
Repair the Injector Common Driver circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6 Refer to the appropriate Service Information and perform the Fuel Pressure Test.
NOTE: The following is a list of problems that can cause the fuel pressure to
become out of specification: restricted fuel filter or fuel lines, failed fuel
pressure solenoid, air in fuel system, failed fuel sending unit, gelled fuel,
faulty injector.
Is the fuel pressure within specification? All
Yes
→
Replace the Fuel Pressure Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
165
DRIVEABILITY - DIESEL
P1130-FUEL RAIL PRESSURE MALFUNCTION ACTUATOR STICKING —
Continued
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