DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 227 / 284

Symptom:
*CHECKING THE ECM POWER AND GROUND CIRCUITS
POSSIBLE CAUSES
ASD RELAY OUTPUT CIRCUIT(S) OPEN
ECM GROUND CIRCUIT(S) OPEN
FUSED ASD RELAY BATTERY SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check both of the ECM ground
circuits in ECM harness connector C1 cavities 1 and 2.
Did the test light illuminate for both cavities? All
Yes
→
Go To 2
No
→
Repair the ECM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
2 Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch
Output circuit in ECM harness connector C1 cavity 22.
Is the test light on? All
Yes
→
Go To 3
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3 Turn the ignition off.
Remove the ASD Relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused ASD Relay Battery
Supply circuit in ASD Relay connector cavity 30.
Is the test light on? All
Yes
→
Go To 4
No
→
Repair the Fused ASD Relay Battery Supply circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 in the ASD Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
ECM harness connector C1 cavities 4 and 5.
Did the test light illuminate for both circuits? All
Yes
→
Test Complete.
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
219
DRIVEABILITY - DIESEL
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