Abs Diagnostic System Check - GMC chervolet camaro 1999 Service Manual

Brakes
ABS Diagnostic System Check
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1-1o1 At All Times
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L4
: Cel110
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ABS BATT 1 L2 ABS BATT 2
1
Electrical
Maxlfuse
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K2 MaxiFuse (8)
1
Center 1
40A SOA I
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Antilock Brake System 5·129
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Data Link
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Connector
(DLC)
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Underhood
H9 ABS IGN
Distribution
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Electrical
I MiniFuse
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Cell 10 I
Center 2
IHB
10A
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1, _
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3 RED 302
5 RED 1802
0.8 PNK 739
0.35~11132
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POMr
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Distribution
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Cell 10
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- - - - ., Underhood
ABS BATT I
Electrical
MlnlFuse 9 I
Center 1
25A I
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7i;-:3- . ,
Star
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Connector
I Connector
Cell50
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2BLK 651
0.35 LT BL~11122
A3 C200D
0.35 LT BLU 1122
3 ORN 440
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C200A
15 13 _________ 1~ ____________________
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Battery - - - - "eatt;.y- - - - - - - - - - -
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Electronic
Positive Positive Positive
Data I
Brake And
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Voltage Voltage Voltage Line .
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Traction
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Class
2 I Control
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(EBCM/
L - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ..
EBTCM)
G101
Circuit Description
The EBCM/EBTCM Diagnostic System Check is an
organized approach to identify problems associated
with the EBCM/EBTCM. This check must be the
starting point for any EBCM/EBTCM complaint, and
will direct you to the next logical step in diagnosing the
complaint. The EBCM/EBTCM is a very reliable
component and is not likely the cause of the
malfunction. Most system complaints are linked to
faulty wiring, connectors, and occasionally to
components. Understanding the ABS system and
using the tables correctly will reduce diagnostic time
and prevent unnecessary parts replacement.
Diagnostic Aids
• An intermittent failure in the electronic system
may be very difficult to detect and to accurately
diagnose. The EBCM/EBTCM test for different
malfunctions under different vehicle conditions. For
this reason, a thorough test drive is often
needed in order to repeat a malfunction. If the
system malfunction is not repeated during the test
,:~
213303
drive, a good description of the complaint may be
very useful in locating an intermittent malfunction.
Faulty electrical connections or wiring causes
most intermitting problems. When an intermitting
condition is suspected, check the suspected
circuits for the following conditions:
- Poor mating of connector halves or backed
out terminals
- Improperly formed or damaged terminals
- Wire chafing
- Poor wire to terminal connections
- Dirty or corroded terminals
- Damage to connector bodies
• If the OTC is a history OTC, the problem may be
intermittent. Perform the tests shown while
moving related wiring and connectors. This can
often cause the malfunction to occur. Perform
a thorough inspection of all related wiring
and connectors pertaining to the history OTC
stored. Refer to lntermittents and Poor
Connections Diagnosis in wiring system.