1995 ISUZU TROOPER Workshop Manual

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-17
DIAGNOSTIC TROUBLE CODES
FLASHOUT CODES CHART
CONDITION ACTION TO
TAKE
Rr. ABS light flashes 2 times. See Flashout Diagnostic
(High resistance
isolate circuit or malfunctioning EBCM) Trouble Code (DTC) 2
Rr. ABS light flashes 3 times. See Flashout DTC 3
(High resistance
dump circuit or malfunctioning EBCM)
Rr. ABS light flashes 4 times.
See Flashout DTC 4
(Closed rear wheel antilock valve switch)
Rr. ABS light flashes 5 times.
See Flashout DTC 5
System dumps
too many times in 2WD (2WD and 4WD vehicles)
condition
Occurs while making normal or hard stops. Rear brake may lock.
Rr. ABS light flashes 6 times.
See Flashout DTC 6
(Erratic speed sensor reading
while driving)
Rr. ABS light flashes 7 times. See Flashout DTC 7
Isolation output missing or antilock valve wiring shorted to ground
Rr. ABS light flashes 8 times.
See Flashout DTC 8
Dump
output missing or antilock valve wiring shorted to ground
Rr. ABS light flashes 9 times. See Flashout DTC 9
(High sensor resistance)
Rr. ABS light flashes 10 times.
See Flashout DTC 1 0
(Low sensor resistance)
Rr. ABS light flashes 11 times.
See Flashout DTC 11
Stop light switch circuit defective, condition indicated only when driving
above
56 km/h (35 mph)
Rr. ABS light flashes 13 times.
See Flashout DTC 13
(Speed processor check EBCM)
Rr. ABS light flashes 14 times.
See Flashout DTC 14
(Program check
EBCM)
Rr. ABS light flashes 15 times.
See Flashout DTC 15
(Memory failure EBCM)
NOTE:
• Codes 1, 12 and over 15 are not utilized for the diagnostic mode.
EBCM = Electronic Brake Control Module

5A3-18 REAR WHEEL ANTILOCK BRAKE SYSTEM
DIAGNOSIS PROCEDURE
FLASHOUT DIAGNOSTIC TROUBLE CODE 2
(HIGH RESISTANCE ISOLATE CIRCUIT OR MALFUNCTIONING EBCM)
Antilock valve
Isolate.
Retest SW.
(EBCM)
Dump
• DISCONNECT THE BATIERY GROUND CABLE.
• DISCONNECT THE EBCM HARNESS CONNECTOR FROM EBCM, AND
CHECK FOR RESISTANCE BETWEEN EBCM HARNESS CONNECTOR PIN (1) AND CHASSIS GROUND WHILE SHAKING THE HARNESS.
CONSTANT READING
OF RESISTANCE 3 TO 6 OHMS
CHECK EBCM VALVE AND GROUND CONNECTION
NO
PROBLEM IN EBCMIVALVE AND GROUND CONNECTION.
CONNECT
EBCM TO HARNESS CONNECTOR THEN TURN IGNITION ON.
NO CODE
2 INDICATED
REPLACE ANTILOCK VALVE AND RECHECK
THE SELF CHECK AND RETEST VEHICLE.
PROBLEM FOUND REPAIR CONNECTION(S) AND/OR GROUND
CODE 2 RETURNS
REPLACE EBCM AND
RECHECK THE SELF CHECK.
EBCM
= Electronic Brake Control Module
4!1
Continued on the next page
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-19
Continued from the previous page
• DISCONNECT ANTI LOCK VALVE HARNESS CONNECTOR, AND CHECK FOR RESISTANCE BETWEEN GROUND PIN (3) OF VALVE HARNESS CONNECTOR AND CHASSIS
HARNESS GROUND WHILE SHAKING THE HARNESS.
CONSTANT READING
RESISTANCE
OVER 1 OHM OF
REPAIR OPEN CIRCUIT IN VALVE GROUND WIRE HARNESS OR LOOSE CONNECTOR PINS, AND RECHECK THE SELF CHECK.
Valve connector
CONSTANT READING OF RESISTANCE UNDER 1 OHM
•
CHECK FOR RESISTANCE BETWEEN ISOLATION PIN (4) AND
GROUND PIN (3) OF VALVE
CONNECTOR.
Harness connector
REPAIR OPEN ISOLATION SOLENOID WIRE FROM THE VALVE TO EBCM OR LOOSE PINS IN CONNECTOR, AND RECHECK THE SELF CHECK.
REPLACE THE ANTILOCK VALVE, AND RECHECK THE SELF CHECK.
EBCM ~ Electronic Brake Control Module

5A3-20 REAR WHEEL ANTILOCK BRAKE SYSTEM
FLASHOUT DIAGNOSTIC TROUBLE CODE 3
(HIGH RESISTANCE DUMP CIRCUIT OR MALFUNCTIONING EBCM)
Anti lock valve
Isolate.
Reset SW.
(EBCM)
Dump
• DISCONNECT THE BATTERY GROUND CABLE.
• DISCONNECT EBCM HARNESS CONNECTOR FROM EBCM,
AND CHECK FOR RESISTANCE BETWEEN EBCM HARNESS CONNECTOR PIN (9) AND CHASSIS GROUND WHILE SHAKING THE HARNESS.
CONSTANT READING
OF RESISTANCE 1 TO 3 OHMS
CHECK EBCM
VALVE AND GROUND CONNECTION
NO
PROBLEM IN EBCMIVALVE AND
GROUND CONNECTION.
CONNECT EBCM TO HARNESS CONNECTOR
THEN TURN IGNITION ON.
NO CODE 31NDICATED
REPLACE ANTILOCK
VALVE AND RECHECK THE SELF CHECK AND RETEST VEHICLE.
PROBLEM FOUND REPAIR CONNECTION(S) AND/OR GROUND
CODE 3 RETURNS
REPLACE EBCM
AND RECHECK THE SELF
CHECK.
EBCM
~ Electronic Brake Control Module
4Q
1.5 !l
Continued on the next page
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-21
Continued from the previous page
• DISCONNECT ANTILOCK VALVE HARNESS CONNECTOR, AND CHECK FOR RESISTANCE BETWEEN GROUND PIN (3) OF VALVE HARNESS CONNECTOR AND CHASSIS
HARNESS GROUND WHILE SHAKING THE HARNESS.
CONSTANT READING
RESISTANCE
OVER 1 OHM
Valve
connector
OF CONSTANT READING OF RESISTANCE UNDER 1 OHM
•
CHECK FOR RESISTANCE BETWEEN DUMP PIN (1) AND
GROUND PIN (3) OF VALVE
CONNECTOR Harness
connector
REPAIR OPEN DUMP SOLENOID WIRE FROM THE VALVE TO THE EBCM OR LOOSE PINS IN THE CONNECTOR, AND RECHECK THE SELF CHECK.
REPLACE THE ANTILOCK VALVE, AND RECHECK THE SELF CHECK.
EBCM -Electronic Brake Control Module

5A3-22 REAR WHEEL ANTILOCK BRAKE SYSTEM
FLASHOUT DIAGNOSTIC TROUBLE CODE 4
(CLOSED REAR WHEEL ANTILOCK VALVE SWITCH)
Isolate.
Reset SW.
(EBCM)
Dump
Valve connector
Anti lock valve
• DISCONNECT ANTILOCK VALVE CONNECTOR, AND CHECK FOR RESISTANCE BETWEEN THE VALVE CONNECTOR RESET SWITCH PIN {2) AND THE VALVE BODY.
4Q
CONSTANT READING OF RESISTANCE UNDER 10K OHMS
CONSTANT READING OF RESISTANCE OVER 10K OHMS
REPLACE ANTILOCK VALVE, AND RECHECK THE SELF CHECK.
Valve connector
• CHECK FOR RESISTANCE BETWEEN THE VALVE CONNECTOR RESET SWITCH PIN {2) AND GROUND PIN (3).
Continued on the next page
•

REAR WHEEL ANTILOCK BRAKE SYSTEM 5A3-23
Continued from the previous page
CONSTANT READING OF RESISTANCE UNDER 10K OHMS
REPLACE ANTILOCK VALVE, AND RECHECK THE SELF
CHECK. CONSTANT
READING
OF RESISTANCE OVER 10K OHMS
• DISCONNECT
THE EBCM HARNESS CONNECTOR FROM
EBCM, AND CHECK FOR RESISTANCE BETWEEN EBCM HARNESS CONNECTOR PIN (4) AND CHASSIS GROUND WHILE SHAKING THE HARNESS.
CONSTANT READING
OF CONSTANT READING OF ERRATIC RESISTANCE READING RESISTANCE UNDER 100K OHMS
REPAIR SHORT IN VALVE RESET
WIRE FROM VALVE TO EBCM HARNESS CONNECTOR, AND
RECHECK THE SELF CHECK. RESISTANCE
OVER 100K OHMS
CONNECT
EBCM TO HARNESS
CONNECTOR, THEN TURN IGNITION
ON. REPAIR THE HARNESS
NO CODE 41NDICATED,
OR WHEN PRESS THE BRAKE PEDAL AS HARD AS POSSIBLE, CODE 4 RETURNS. CODE 4 RETURNS WITHOUT BRAKE APPLICATION
REPLACE ANTI LOCK VALVE AND RECHECK THE SELF CHECK AND RETEST VEHICLE. REPLACE EBCM, AND RECHECK THE SELF CHECK.
EBCM
-Electronic Brake Control Module