C1244

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Circuit Description
Diagnostic Trouble Code (DTC) C1244 detects a bound-up Expansion Spring Brake (EBS), a stuck Antilock Brake System (ABS) motor, or a seized brake modulator. When the release is commanded during initialization, the EBS should release the ABS motor, resulting in the sensed current being less than the commanded current (motor spins freely). If the ABS motor is not moving, sensed current will be equal to stall currents.

Conditions for Setting the DTC
- DTC C1244 can set during brake motor initialization at the following speeds:
- 0 km/h (0 mph) when the brake is off
- 5 km/h (3 mph) when the brake is on
- This DTC can be set during an ABS event
- This DTC can be set during scan tool testing.
- The Electronic Brake Control Module (EBCM) commands the left front motor in the reverse and forward direction to ensure the motor moves properly
- The EBCM detects a condition in which it cannot move the left motor in either direction (sensed current of the left motor is greater than 8A)
- If the motor pack was removed from the hydraulic modulator without performing the scan tool's Gear Tension Relief function, this DTC may set after motor pack-to-hydraulic modulator reassembly.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS disables.
- The ABS warning indicator turns ON.

Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off.

Diagnostic Aids
The following conditions may cause an intermittent malfunction if the conditions exist in a mechanical part of the system:
- Sticking
- Binding
- Slipping

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. DTC C1244 may set after modulator disassembly if the modulator pistons are positioned at the bottom of the modulator piston bore.
Clear the DTCs after completing the diagnosis. Test drive the vehicle for three drive cycles in order to verify that the DTC does not reset. Use the following procedure in order to complete one drive cycle:
1. Start the vehicle.
2. Drive the vehicle over 16 km/in (10 mph).
3. Stop the vehicle.
4. Turn the ignition to the OFF position.

IMPORTANT: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.