GMC chervolet camaro 1999 Service Manual page 682

1
I
Brakes Antilock Brake System 5-207
DTC C0239 TCS Spark Retard Monitoring Malfunction
... - - - - - - - - - - - - - - - - - - ., Electronic
1 ... :
Brake And Traction
I
J
Spark
Tachometer
11
Control
I
Retard
Input
I
Module
~ -:i::~' = ' - -=
-=--'='--::-~ ::-_-:::'"-:' - - _
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(E:CM/EBTCM)
19 11 C1
'1J'6
0.35 GRYJWHT 1687
0.35WHT 121
K C101
G ••
C105
0.35WHT 121
0.35GRYJWHT 1687
$120
0.35 WHT ..
f
:;:::m
I
121
C&ll81
Circuit Description
0.35WHT 121
(V8)
10
53 '-----------------~-~ "C2
~--rr------~--
- ;;----~~;~grain
I PWM Out Tachometer I
Module
I
Output
I
I
TCS
Spark
1
(PCM)
~
-----:.-~
~~
------------
~
:.~ A
Diagnostic Aids
213286
Spark Retard is simultaneously controlled by the
EBTCM and the PCM. The PCM supplies a 12 volt
pull up voltage. This voltage is monitored by the PCM,
the EBTCM requests spark retard by pulling the
voltage low.
• It is very important that a thorough inspection of
the wiring and connectors be performed. Failure
Conditions for Setting the OTC
OTC C0239 can be set anytime when the EBTCM
senses a short to ground, a short to battery voltage, or
an open in CKT 1687.
Action Taken When the OTC Sets
• A
malfunction OTC is stored.
• The ABS!TCS is disabled.
• The Red BRAKE Warning indicator turn on.
Conditions for Clearing the OTC
• Condition for OTC is no longer present and scan
tool clear OTC function is used.
• 100 ignition cycles have passed with no OTCs
detected.
to carefully and fully inspect wiring and connectors
may result in misdiagnosis, causing part
replacement with reappearance of the malfunction.
• If an intermittent malfunction exists refer to
General Electrical Diagnosis Cell 4 in Wiring
Systems.
Test Description
The number(s) below refer to the step number(s) on
the diagnostic table.
2. This step checks for the pull up voltage from
the PCM.
3. This step checks for a short to voltage.
6. This step checks for a short to ground.