Jeep WG Grand Cherokee 2002, Service Manual

Page: 46 / 74

TEST ACTION APPLICABILITY
2 Turn the ignition on.
With the DRBIII
t
, read DTC’s.
With the DRBIII
t
, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t
, actuate the ABS pump motor.
Did the Pump Motor operate when actuated?
All
No
→
Go To 3
Yes
→
Go To 14
3 Turn the ignition off.
Remove and inspect the ABS Pump fuse #4 in the PDC.
Is the Fuse blown? All
Yes
→
Go To 4
No
→
Go To 8
4 Turn the ignition off.
Make sure the Pump Motor connector is secure.
Visually inspect the Fused B(+) Circuit in the wiring harness from the PDC to the
CAB. Look for any sign of an Intermittent Short to Ground.
Is the wiring harness OK? All
Yes
→
Go To 5
No
→
Repair the Fused B(+) Circuit shorted to ground. The CAB must
sense all four wheels at 25 km/h (15 mph) before it will extinguish
the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
5 Turn the ignition off.
Remove the ABS PUMP Fuse # 4 from the Power Distribution Center (PDC).
Disconnect the CAB connector.
Make sure the Pump Motor connector is secure.
Note: Check connector - Clean/repair as necessary.
Using a test light connected to 12 volts, probe the Fused B (+) Circuit.
Is the test light on? All
Yes
→
Repair the Fused B(+) circuit short to ground. The CAB must
sense all four wheels at 25 km/h (15 mph) before it will extinguish
the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Go To 6
6 Turn the ignition off.
Make sure the Pump Motor connector is secure.
Remove the ABS PUMP Fuse 4 from the PDC.
The CAB must be connected for the results of this test to be valid.
Using a test light connected to 12 volts, probe the Fused B (+) circuit in the PDC.
Is the test light on? All
Yes
→
Replace the Controller Anti-Lock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Go To 7
44
BRAKES (CAB)
PUMP MOTOR CIRCUIT NOT WORKING PROPERLY —
Continued
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