Dodge RAM TRUCK 1500 1995 Service Manual page 202

5-30
REAR WHEEL ANTILOCK BRAKE (RWAL) SYSTEM
B R
FAULT
C O M
NUMBER
T Y P I C A L FAILURE DETECTED
1 Not used.
2
Open isolation valve wiring or bad control
module.
3 Open dump valve wiring or bad control
module.
4
Closed RWAL valve switch.
5
Over 16 dump pulses generated in 2WD
vehicles (disabled for 4WD).
6
Erratic speed sensor reading while rolling.
7 Electronic control module fuse pellet open,
isolation output missing, or valve wiring
shorted to ground.
8 Dump output missing or valve wiring shorted to
ground.
9
Speed sensor wiring/resistance (usually high
reading).
10 Sensor wiring/resistance (usually low reading).
11
Brake switch always on. RWAL light comes on
when speed exceeds 40 mph.
12 Not used.
13 Electronic control module phase lock loop
failure.
14 Electronic control module program check
failure.
15 Electronic control module RAM failure.
J9005-101
Fig. 6 RWAL Antilock System Flash Codes
warning light to illuminate, despite the fact that an
actual fault has not occurred.
Another driver induced fault involves holding the
brake pedal in an applied position while starting the
engine. This practice causes the stoplamp switch to
be in a closed position when the engine is started.
With the switch closed, the RWAL system self check
feature will not be completed. The result is illumina­
tion of both warning lights and trouble code 11 to be
registered in system memory.
ANTILOCK COMPONENT SERVICEABILITY
The RWAL valve, combination valve, electronic
module, rear wheel speed sensor, exciter ring and in­
terconnecting brakelines are not repairable. These
components are serviced by replacement only.
The combination valve mounting bracket is not ser­
viced separately. The bracket and valve are serviced
as an assembly.
RWAL VALVE/COMBINATION VALVE REMOVAL
(1) Disconnect ground wire and harness wires from
combination valve switch and RWAL valve (Fig. 7).
Fig. 7 Valve Harness Connector And Ground Wire
Locations
(2) Disconnect lines to front and rear brakes from
RWAL and combination valves (Fig. 8).
BRAKES J9405-82
Fig. 8 Master Cylinder Brakeline Removal