DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 59

P0201-CYLINDER 1-INJECTOR CIRCUIT CURRENT DECREASE —
Continued
TEST
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Cylinder Fuel Injector harness connector.
Measure the resistance between ground and the Fuel Injector Control circuit.
Is the resistance below 1000 ohms?
Yes → Repair the Fuel Injector Control circuit for a short to ground.
→ Go To 5
No
5 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Cylinder Fuel Injector harness connector.
Measure the resistance between ground and the Common Driver circuit.
Is the resistance below 1000 ohms?
Yes → Repair the Common Driver circuit for a short to ground.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Cylinder Fuel Injector harness connector.
Measure the resistance between the Fuel Injector Control circuit and the Common
Driver circuit.
Is the resistance below 1000 ohms?
Yes → Repair the Fuel Injector Control circuit and Common Driver
→ Go To 7
No
7 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Cylinder Fuel Injector harness connector.
Measure the resistance of the Fuel Injector Control circuit.
Is the resistance below 10 ohms?
Yes → Go To 8
→ Repair the Fuel Injector Control circuit for an open.
No
8 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Cylinder Fuel Injector harness connector.
Measure the resistance of the Common Driver circuit.
Is the resistance below 10 ohms?
Yes → Go To 9
→ Repair the Common Driver circuit for an open.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
circuit for a short together.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
51
APPLICABILITY
All
All
All
All
All