A045

Fig. 487 Code 45: Right Front Channel Will Not Move:

DTC A045 Right Front Channel Will Not Move:

Circuit Description:
This DTC is designed to detect a bound-up ESB, a stuck motor or a seized hydraulic modulator. When the release is commanded during initialization, the ESB should release the motor, resulting in sensed current being less than commanded current (motor is spinning freely). If the motor is not moving, sensed current will be equal to stall current.

Failure Condition:
DTC AO45 can be set during normal operation. If the EBCM detects a condition in which it cannot move the motor in either direction a malfunction exists.

Action Taken:
This malfunction indicates the channel cannot be moved properly. A DTC AO45 is stored, ABS is disabled and the "ABS" indicator is turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks for proper motor movement during apply and release commands from the TECH 1.
2. This step compares EBCM command current to motor feedback current.
3. This step checks for proper hydraulic modulator gear and piston movement.
4. This step verifies that the motor can actually apply when commanded.
5. This test determines if the malfunction is caused by a defective EBCM or by a short circuit.

Diagnostic Aids:
An "intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH 1.

DTC AO45 may set after modulator disassembly if the modulator pistons are positioned at the bottom of their bore.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.