GMC chervolet camaro 1999 Service Manual page 662

Brakes Antilock Brake System 5-187
DTC C0121 Valve Relay Circuit Malfunction (cont'd)
Step Action
Value(s) Yes
No
Repair the short to ground in CKT 1802. Refer to Repair
Go to ABS
9
Procedures Cell 5 in Electrical Diagnosis.
- Diagnostic
-
Is the circuit repair complete?
System Check
Using the J 39200 DMM, probe between the ABS BA TT 2
Go to Power
fuse test terminals and a good ground in order to measure
Distribution
10
the voltage.
Battery voltage Go to Step 11
Cell 10 in
Electrical
Is the voltage within specifications?
Diagnosis
Using the J 39200 DMM, probe between the ABS BA TT
11
Minifuse test terminals and a good ground in order to
Battery voltage Go to Step 13 Go to Step 12
measure the voltage.
Is the voltage within specifications?
Repair the open or high resistance in CKT 1802. Refer to
Go to ABS
12
Repair Procedures Cell 5 in Electrical Diagnosis. -
Diagnostic
-
Is the circuit repair complete?
System Check
1. Turn the ignition switch to the OFF position.
2. Disconnect the EBCM/EBTCM connector C1.
3. Connect the J 39700 Universal Pinout Box using the
J
39700 - 530 cable adapter to the EBCM/EBTCM
13
harness connector only.
Battery voltage Go to Step 7 Go to Step 14
4. Turn the ignition switch to the RUN position,
engine off.
5. Using the J 39200 DMM, measure the voltage at
terminal 14 of the J 39700.
\
Is the voltage within specifications?
I
Repair the open or high resistance in CKT 440. Refer to
Go to ABS
14
Repair Procedures Cell 5 in Electrical Diagnosis.
-
Diagnostic
-
Is the circuit repair complete?
System Check