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Checking System For Faults

  1. Using scan tool, read trouble codes. If scan tool is showing a blank message screen, go to TEST 18A. If scan tool is displaying NO RESPONSE message, go to TEST 17A. If another error message is displayed, refer to scan tool manufacturer's instructions.
  2. Press on brake pedal and check display on scan tool. If scan tool does not display proper reading of brake pedal, perform TEST 19A. If no trouble codes are present, turn ignition off and on. Using scan tool, read trouble codes. Monitor display for 4 minutes. If no trouble codes are present, perform TEST VER-2A. If trouble codes are present, go to next step.
  3. In some cases, cause of one trouble code may set additional trouble codes. If multiple trouble codes appear on scan tool, fault repairs must be performed in order they appear in TROUBLE CODES table. If only one trouble code is set, perform indicated test for that trouble code.
TROUBLE CODES

Trouble Code Test No.
LF SOLENOID CIRCUIT OPEN 2A
LR SOLENOID CIRCUIT OPEN 2A
LF SOLENOID CIRCUIT SHORTED 2A
LR SOLENOID CIRCUIT SHORTED 2A
MODULATOR CIRCUIT 2A
RF SOLENOID CIRCUIT OPEN 2A
RR SOLENOID CIRCUIT OPEN 2A
RF SOLENOID CIRCUIT SHORTED 2A
RR SOLENOID CIRCUIT SHORTED 2A
SOLENOID UNDERVOLTAGE 3A
ABS SYSTEM RELAY CIRCUIT 3A
ABS SYSTEM RELAY CONTROL CIRCUIT 3A
ABS SYSTEM RELAY GND CIRCUIT OPEN 3A
ABS SYSTEM RELAY OUTPUT CIRCUIT 3A
PUMP/MOTOR CIRCUIT 4A
PUMP/MOTOR MONITOR CIRCUIT 4A
PUMP/MOTOR RELAY CONTROL CIRCUIT 4A
PUMP/MOTOR OUTPUT CIRCUIT 4A
ABS WARNING LAMP DIODE CIRCUIT 6A
ABS WARNING LAMP CIRCUIT 7A
EXCESS DECAY 8A
RR WHEEL SPEED SENSOR 9A
RR WSS ERRATIC SIGNAL 9A
RR WSS MISSING SIGNAL 9A
LR WHEEL SPEED SENSOR 10A
LR WSS ERRATIC SIGNAL 10A
LR WSS MISSING SIGNAL 10A
RF WHEEL SPEED SENSOR 11A
RF WSS ERRATIC SIGNAL 11A
RF WSS MISSING SIGNAL 11A
LF WHEEL SPEED SENSOR 12A
LF WSS ERRATIC SIGNAL 12A
LF WSS MISSING SIGNAL 12A
RR WSS CONTINUITY 13A
RR WSS DYNAMIC CONTINUITY 13A
RR WSS STATIC CONTINUITY 13A
LR WSS CONTINUITY 14A
LR WSS DYNAMIC CONTINUITY 14A
LR WSS STATIC CONTINUITY 14A
RF WSS CONTINUITY 15A
RF WSS DYNAMIC CONTINUITY 15A
RF WSS STATIC CONTINUITY 15A
LF WSS CONTINUITY 16A
LF WSS DYNAMIC CONTINUITY 16A
LF WSS STATIC CONTINUITY 16A
NO RESPONSE 17A
Blank Screen 18A
STOP LAMP SWITCH INPUT TO CAB 19A
CAB MEMORY ERROR 20A
CONTROLLER ANTILOCK BRAKE (CAB) 20A
CONTROLLER ENABLE 20A
INTERMITTENT WSS SIGNAL 28A
INTERMITTENT LF WSS SIGNAL 28A
INTERMITTENT LR WSS SIGNAL 28A
INTERMITTENT RF WSS SIGNAL 28A
INTERMITTENT RR WSS SIGNAL 28A
WSS SPEED COMPARISON 29A
CAB SENSOR CIRCUIT 30A
CAB MALFUNCTION 31A
PUMP/MOTOR STALLED (1)
(1) Replace pump/motor.
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