Dodge ZB 2005 Service Manual page 174

ZB
BRAKES - ABS (Continued)
CAUTION: Only the recommended jacking or hoist-
ing positions for this vehicle are to be used when-
ever it is necessary to lift a vehicle. Failure to raise
a vehicle from the recommended locations could
result in lifting a vehicle by the hydraulic control
unit mounting bracket. Lifting a vehicle by the
hydraulic control unit mounting bracket will result
in damage to the mounting bracket and the hydrau-
lic control unit.
CAUTION: Brake fluid will damage painted surfaces.
If brake fluid is spilled on any painted surface,
wash off with water immediately.
DIAGNOSIS AND TESTING - INSPECTION AND
ROAD TEST
(1) Visually inspect the ABS for damaged or dis-
connected components and connectors.
(2) Check the vehicle battery voltage. Ensure that
battery voltage is not above 15 volts or below 11
volts. Repair as necessary before continuing.
(3) Verify the brake lamps are operational. If they
are not, repair them prior to continuing.
(4) Connect the DRBIII
Link Connector located under the instrument panel
to the right of the steering column. If the DRBIII
does not power-up, check the power and ground sup-
plies to the connector.
(5) Turn the ignition key to the ON position. Select
ANTILOCK BRAKES.
(6) Read and record any Diagnostic Trouble Codes
(DTCs). If any DTCs are present, refer to the appro-
priate chassis diagnostic information.
NOTE: Diagnostic trouble codes (DTCs) are kept in
the controller's memory until either erased by the
technician using the DRBIII , or erased automati-
cally after 3500 miles or 255 ignition key cycles,
whichever occurs first. DTCs are retained by the
controller even if the ignition is turned off or the
battery is disconnected. More than one DTC can be
stored at a time. When accessed, the number of
occurrences and the DTC that is stored are dis-
played.
If no problems are observed, it will be necessary to
road test the vehicle.
Many ABS conditions judged to be a problem by
the driver may be normal operating conditions. To
become familiarized with the normal operating char-
acteristics of this antilock brake system, (Refer to 5 -
BRAKES - ABS - OPERATION).
scan tool to the Data
WARNING: CONDITIONS THAT RESULT IN TURNING
ON THE RED BRAKE WARNING INDICATOR LAMP
MAY INDICATE REDUCED BRAKING ABILITY.
Before road testing a brake complaint vehicle, note
whether the red BRAKE warning indicator lamp,
amber ABS warning indicator lamp, or both are
turned on. If it is the red BRAKE warning indicator,
there is a brake hydraulic problem that must be cor-
rected before driving the vehicle (Refer to 5 -
BRAKES - BASE - DIAGNOSIS AND TESTING). If
the red BRAKE warning indicator is illuminated,
there is also a possibility that there is an ABS prob-
lem and the amber ABS warning indicator is not able
to illuminate. The red BRAKE warning indicator
lamp is then turned on by default.
If the amber ABS warning indicator is on, road test
the vehicle as described below. While only the amber
ABS warning indicator is on, the ABS is not func-
tional. The ability to stop the car using the base
brake system should not be affected.
(7) Turn the key to the OFF position and then
back to the ON position. Note whether the amber
ABS warning indicator lamp continues to stay on.
(8) If the amber ABS warning indicator lamp stays
on, shift into gear and drive the car to a speed of
approximately 25 km/h (15 mph) to complete the ABS
Start-Up and Drive-Off Cycles (see Antilock Brake
System - Operation). If at this time the amber ABS
warning indicator lamp stays on, refer to the Appro-
priate Diagnostic Information.
(9) If the amber ABS warning indicator lamp goes
out at any time, drive the vehicle a short distance.
Accelerate the vehicle to a speed of at least 64 km/h
(40 mph). Bring the vehicle to a complete stop, brak-
ing hard enough to cause the ABS to cycle. Repeat
this action several times. Using the DRBIII , read
and record any Diagnostic Trouble Codes (DTCs). If
any DTCs are present, refer to the Appropriate Diag-
nostic Information.
STANDARD PROCEDURE - ANTILOCK BRAKE
SYSTEM BLEEDING
The base brake's hydraulic system must be bled
anytime air enters the hydraulic system. The ABS
though, particularly the ICU (HCU), should only
need to be bled when the HCU is replaced or
removed from the vehicle. The ABS must always be
bled anytime it is suspected that the HCU has
ingested air. Under most circumstances that require
the bleeding of the brakes hydraulic system, only the
base brake hydraulic system needs to be bled.
When bleeding the ABS system, the following
bleeding sequence must be followed to insure com-
plete and adequate bleeding.
BRAKES - ABS 5 - 49