PRE-RELEASE
DTC C0166
| DTC C0166 |
| Diagnostic Instructions |
| • |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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| • |
Diagnostic Procedure Instructions
has overviews of all diagnostic categories.
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| DTC Descriptor |
DTC C0166 00
Traction Control System Brake Switch Circuit Malfunction
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|
5V Reference
|
C0277 06
|
C0277 06
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-
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-
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Signal
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C0277 06
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C0277 06
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C0277 07
|
C0277 09
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Low Reference
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-
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C0277 06
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-
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-
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| Circuit/System Description |
The body control module (BCM) monitors the brake pedal position sensor and sends a serial data message when the brake pedal is applied. When the vehicle is stopping, the electronic brake control module (EBCM) monitors for the brake pedal applied serial data message from the BCM, with the brake pressure increasing and the vehicle slowing down, or when the vehicle is accelerating, the brake pedal is not applied and brake pressure is not increasing.
| Conditions for Running the DTC |
| • |
Ignition ON.
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| • |
DTC C0131 is not present.
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| Conditions for Setting the DTC |
| • |
The EBCM detects brake pedal is not applied and the brake pressure is greater 15 bar (218 PSI) for 2 s.
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The EBCM detects the vehicle speed is greater than 16 km/h (10 MPH), the brake pedal is applied for 122 s, and brake pressure is less than 6.2 bar (90 PSI).
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| Action Taken When the DTC Sets |
The EBCM disables the hill start assist for the duration of the ignition cycle.
| Conditions for Clearing the DTC |
| • |
A current DTC clears when the diagnostic runs and passes.
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| • |
The EBCM will turn OFF the indicator in the next ignition cycle.
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| Reference Information |
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
| • |
Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for information on diagnostic tools
| Circuit/System Verification |
| 1. |
Ignition ON, verify that DTC C0277 is not present in the BCM.
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| 2. |
If DTC C0277 is present, refer to
DTC C0277 or C0890
.
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| 3. |
Ignition ON, observe the stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.
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| 4. |
If the stop lamps do not operate properly, refer to
Symptoms - Lighting
.
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| Circuit/System Testing |
Replace the K17 Electronic Brake Control Module and verify the DTC does not reset.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM and EBCM replacement, setup, and programming
