DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 221 / 284

TEST ACTION APPLICABILITY
4 NOTE: If the A/C Clutch fuse is open, refer to the system schematics for all
circuits that are powered by the A/C Clutch fuse to determine the cause of
the blown fuse.
Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the PDC.
Does the test light illuminate brightly? All
Yes
→
Go To 5
No
→
Repair the Fused B+ circuit. Inspect fuse and replace as neces-
sary.
Perform ROAD TEST VERIFICATION - VER-2.
5 Turn the ignition off.
Install a substitute relay in place of the A/C Clutch Relay.
Turn the ignition on.
With the DRBIII
t
, actuate the A/C Clutch Relay.
Does the A/C Clutch Relay cycle on and off?
All
Yes
→
Replace the A/C Clutch Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 6
6 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Disconnect the A/C Clutch harness connector.
Measure the resistance between ground and the A/C Clutch Relay Output circuit.
Is the resistance above 100 kohms? All
Yes
→
Go To 7
No
→
Repair the A/C Clutch Relay Output circuit for a short to ground.
Inspect fuse and replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
7 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Disconnect the A/C Clutch harness connector.
Measure the resistance of the A/C Clutch Relay Output circuit.
Is the resistance below 5.0 ohms? All
Yes
→
Go To 8
No
→
Repair the A/C Clutch Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
8 Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Using a 12-volt test light connected to 12-volts, check the A/C Clutch Ground circuit.
Does the test light illuminate brightly? All
Yes
→
Go To 9
No
→
Repair the A/C Clutch Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
213
DRIVEABILITY - DIESEL
*A/C INOPERATIVE —
Continued
ProCarManuals.com