Otc C0171 Tcs Pilot Valve Circuit Malfunction - GMC chevrolet camaro 2000 Service Manual

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Brakes
Antilock Brake System 5-179
DTC C0171 TCS Pilot Valve Circuit Malfunction
Power
Distribution
Systems
14 8 C1
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0.8 PNK 739
3 ORN 440
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Electronic Brake
I
Positive Positive
l
I
Control Module
I Voltage Voltage I
(EBCM)
I Solenoid Valve I
A.
I Control Relay I II"'
I I ~
: Solenoid Valve
ill
Solenoid : . .
I
Relay Control Valve Control
I ---. . ---.. . . . . Ground : ~------------------------------~--------J
I Solenoid Valve I
15 C1
I I
~------------------------------J
Brake Pressure
Modulator Valve
(BPMV)
2 BLK 651
.,... G101
519718
Circuit Description
The Master Cylinder Isolation valve solenoid circuits
are supplied with battery power when the ignition is in
the RUN position. The· EBCM controls the valve · ·.
functions by grounding the circuit when necessary.
Conditions for Setting the DTC
The EBCM senses a discrepancy such as an open,
short to ground, or short to voltage in the circuit.
Action Taken When the DTC Sets
• A malfunction OTC is stored.
• ABS/TCS disabled
• ABS/TCS Indicators are turned on.
• The Red BRAKE Warning Indicator turns on.
Conditions for Clearing the DTC
• Condition for DTC is no longer present and scan
tool clear DTC function is used.
• 100 ignition cycles pass with no DTC detected.
Test Description
The _numbers below refer to step numbers on the
Diagnostic Table.
2. This step determines if the DTC is current.
DTC C0171 TCS Pilot Valve Circuit Malfunction
Step
Action ·, Value(s)
Yes
No
Was the Diagn9stic System Check performed?
Go to A
1
-
Diagnostic
System
Go to Step 2 Check-ABS
· 1. Turn the .ignition switch to the OFF position.
2. Install a scan tool.
2
3. Tum the ignition switch to the RUN position,
-
Go to A
engine 6ff:
Diagnostic
4. Using the. scan tool run the Automated test.
System·
Does DTC C0171 reset as a current OTC?
Go to Step 3 Check-ABS
Replace the EBCM. Refer to Electronic Brake Control Go to A
3
Module (EBCM) Replacement
-
Diagnostic
-
Is the repair complete?
System
Check-ABS
.
.