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C0235






Circuit Description
The EBCM receives the rear wheel speed signal from the Powertrain Control Module (PCM) (2.2L). The rear wheel speed signal originates from the Vehicle Speed Sensor (VSS) which is connected to the PCM.
The EBCM can not directly detect an actual vehicle speed sensor problem, so the EBCM checks for the presence of the PCM when the vehicle is not moving. This is accomplished by detecting 12 VDC from the PCM when the vehicle is powered-up and not moving. The EBCM will look for a persistent low signal from the PCM. If this condition is detected and persists for greater than 500 milliseconds, the DTC will set.

Conditions for Running the DTC
- Ignition switch in the RUN position.
- The vehicle is not moving.

Conditions for Setting the DTC
The EBCM senses no voltage from the PCM, for 500 milliseconds or greater, when the ignition is turned to RUN.

Action Taken When the DTC Sets
- The ABS indicator lamp turns on
- The ABS disables
Malfunction responses to DTC C0235 vary, depending on the affected subsystem.
- ABS-Condition latched
- DRP-DRP critical
For a detailed explanation of DTC malfunction responses, refer to: Self-Diagnostics.

Conditions for Clearing the DTC
- Repair the conditions responsible for setting the DTC.
- Use the Clear DTCs function on the Scan Tool
- A Condition Latched DTC may exist momentarily, or constantly. In either case, the DTC will be stored in the EBCM memory until it is repaired, and/or the DTC is cleared. After the DTC is repaired and/or cleared and the ignition is turned to ON, the ABS lamp will remain lit until the EBCM completes a power-up self test. This test concludes when the vehicle has reached a speed of greater than 13 km/h (8 mph) and the wheel speed inputs have been checked by the EBCM.

Diagnostic Aids
Check for and clear DTCs in the PCM first.
This DTC can be set by a faulty EBCM or a fault in CKT 1827.
If the voltage readings are low or varying, the battery or charging system could be the cause. Check these areas before replacing any components. In addition, any of the following conditions may cause an intermittent malfunction.
- A poor connection
- Wire insulation that is rubbed through
- A wire breaks inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wiring connections
- Physical damage to the wiring harness

Test Description
The numbers below refer to the steps in the diagnostic chart:
[3] This step uses the voltage output from the PCM to check the CKT 1827.
[4] This step attempts to determine if there the PCM can process the VSS input and deliver a VSS output on CKT 1827.

Steps 1-3:




Steps 4-8:




Step 9:





Diagnostic Chart