PRE-RELEASE
DTC C122E
| DTC C122E |
| Diagnostic Instructions |
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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
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC C122E 00
Tire Size Mismatch Malfunction
| Circuit/System Description |
The wheel speeds are detected by active wheel speed sensors. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake control module (EBCM) and provides an alternating current square wave signal to the EBCM. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed. The EBCM sends the wheel speed information as a high speed controller area network (CAN) serial data message.
| Conditions for Running the DTC |
Vehicle speed is greater than 14 km/h (9 MPH).
| Conditions for Setting the DTC |
The engine control module (ECM) detects wheel speed differences between one wheel and the others.
| Action Taken When the DTC Sets |
Specific subsystems will not function or operate in degraded mode.
| Conditions for Clearing the DTC |
A current DTC clears when the diagnostic runs and passes.
| 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
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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 scan tool information
| Circuit/System Verification |
Ignition ON, observe the EBCM scan tool Wheel Speed Sensor parameters. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 MPH).
| Circuit/System Testing |
| 1. |
Ignition ON, verify that DTC C0035, C0040, C0045, C0050, or C0245 is not present in the EBCM.
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| 2. |
If any listed DTC is present, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
to diagnose that DTC prior to this diagnostic.
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| 3. |
Replace the K17 Electronic Brake Control Module and verify the DTC does not reset.
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| 4. |
If the DTC resets, replace the module that set the DTC.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for module replacement, setup and programming
