Chevrolet Cobalt Service & Repair Manual: Anti-Lock Brake System, Inspection
| A visual inspection must always
be performed to confirm the presence of aftermarket components, potential
collision damage, or areas of concern. |
| The ABS module is self monitoring.
The module will carry out a preliminary electrical inspection of the hydraulic
pump motor by turning the pump ON for approximately 1/2 second either when
the ignition switch is turned to the RUN position and the brake pedal is
not pressed or when the vehicle is in motion and at vehicle speeds above
12 mph. The ABS module will also carry out a wheel speed sensor self-test
by sending a reference voltage to all of the wheel speed sensors through
their circuitry when the ignition switch is turned to the RUN position,
with or without brake pedal application. If a fault is detected in the pump
or wheel speed sensors, the ABS module will shut down and disable the anti-lock
system. Normal power assisted braking, however, remains. |
| 1. |
Verify stop lamps operate correctly
by applying and releasing brake pedal with ignition switch in OFF
position. |
| 2. |
Verify that PRNDL operates correctly
on instrument cluster. |
| 3. |
Visually inspect for obvious signs
of mechanical or electrical damage. |
| 4. |
If an obvious cause for an observed
or reported concern is found, correct cause if possible before proceeding. |
| 5. |
Connect a suitably programmed scan
tool to vehicle DLC. |
| 6. |
Carry out network test. |
| 7. |
Clear continuous DTCs and carry out
self-test diagnostics for ABS module. |
|
A visual inspection must always
be performed to confirm the presence of aftermarket components, potential
collision damage, or areas of concern.
The test can be performed w ...
See also:
Chevrolet Cobalt Service & Repair Manual. Passkey Module
On models equipped with the Passkey
Theft Deterrent System, a new password must be learned by the PCM when the
BCM/PCM has been replaced. When the PCM is replaced, the EEPROM calibration
is flashed into the new PCM. Refer to latest GM Techline or equivalent information
for PCM ...
Brakes
Traction Control System, Inspection