Page 1097 of 4087
OKNG
OKNG
INSPECTION PROCEDURES
1Check operation of TRAC pump & motor.
C
OK
P
Notice
Disconnect TRAC pump & motor connector.
Connect positive lead to terminal 3 or TRAC pump &
motor connector and negative lead to terminal 1.
Do not apply battery voltage for more than 3 sec.
The TRAC pump motor should emit an operating
sound.
Go to step 3.
2Check continuity between terminal 1 of TRAC pump & motor connector and b\
ody ground.
C
OK
Measure resistance between terminal 1 of TRAC pump
& motor connector and body ground.
Resistance: 0 (Continuity)
Repair or replace harness or connector.
Replace TRAC pump & motor.
BR±128±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1098 of 4087

OKNG
NGOK
OKNG
3Check harness and connector between ABS & TRAC ECU and TRAC pump & motor (Se\
e page
IN±33).
Repair or replace harness or connector.
4Check voltage between terminals PR and E2 of ABS & TRAC ECU connector.
C
OK
P
OK
C
Notice
1. Remove ABS & TRAC ECU with connectors still
connected.
2. Operate the engine for about 30 seconds at idle speed to raise the pressure of the TRAC actuator
to a high level.
1. Stop the engine and then turn ignition switch ON.
2. Measure voltage between terminals PR and E2 of ABS & TRAC ECU connector.
Voltage: 4 ± 8 V
1. Drain the fluid out of the actuator to reduce the pres-
sure.
2. Measure voltage between terminal PR and E2 of ABS & TRAC ECU connector.
Voltage: 10 ± 14 V
Add fluid to reservoir after the check.
Check and replace ABS & TRAC ECU.
5Check harness and connector between ABS & TRAC ECU and TRAC actuator (See page IN±33).
Repair or replace harness or connector.
Replace TRAC actuator.
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±129
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Page 1099 of 4087
BR±228
WIRING DIAGRAM
DTC54Excessive Operation of TRAC Pump Motor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
54
TRAC motor relay ON is output continuously10 times
at intervals of less than 24 sec.when traction control is
not being executed.
TRAC Actuator
TRAC Accumulator
Brake fluid leakage
ECU
DIAGNOSTIC CHARTDIAGNOSTIC CHART
BR±130±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1100 of 4087
NGOK
OKNG
INSPECTION PROCEDURES
1Check voltage between terminals PR and E21 of ABS & TRAC ECU connector.
C
OK
P1. Remove ABS & TRAC ECU with connectors stillconnected.
2. Operate the engine for about 30 seconds at idle speed to raise the pressure of the TRAC actuator
to a high level.
1. Stop the engine and then turn ignition switch ON.
2. Measure voltage between terminals PR and E2 of ABS & TRAC ECU connector.
Voltage: 4 ± 8 V for more than 24 sec.
Check and replace ABS & TRAC ECU.
2Check for brake fluid leakage.
See page BR±150.
Repair brake fluid leakage and add fluid.
Replace TRAC accumulator.
If TRAC accumulator is replaced and the problem is still occurring, repl\
ace TRAC actuator.
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±131
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Page 1101 of 4087
WIRING DIAGRAM
DTC55Brake Fluid Level Warning Switch Circuit
CIRCUIT DESCRIPTION
The brake fluid level warning switch sends the appropriate signal to the EC\
U when the brake fluid level drops.
DTC No.DTC Detecting ConditionTrouble Area
55Voltage at ECU terminal LBL is 0Vcontinuously for 10
sec. or more.
Brake fluid level.
Brake fluid level warning switch.
Short in brake fluid level warning switchcircuit.
ECU
Fail safe function: If trouble occurs in this circuit, the ECU cuts off current to the TRAC solenoid relay
and prohibits TRAC control.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
BR±132±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1102 of 4087
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check brake fluid level.
Check the amount of fluid in the bake reservoir.C
Check and repair brake fluid leakage and add fluid.
2Check brake fluid level warning switch.
See page BE±142.
Replace brake fluid level warning switch.
3Check for short in all the harness and components connected to brake fluid le\
vel warning light
(See page IN±33).
Repair or replace harness or connector.
Check and replace ABS & TRAC ECU.
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±133
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Page 1103 of 4087
DTC56, 57Pressure Sensor Circuit
CIRCUIT DESCRIPTION
The pressure sensor detects the TRAC accumulator hydraulic pressure and if \
it is low, it sends signals to the
ECU to operate the pump. If the pressure is high, it sends signals to th\
e ECU to stop the pump.
DTC No.DTC Detecting ConditionTrouble Area
56Pressure sensor terminal PR outputs below 1 V for
about 1 sec. or more.
Open or short in pressure sensor circuit.
57
TRAC (BRAKE) control is executed continuouslymore
than 255 times while pressure sensor ONsignal is not
output.
Pressure sensor
Fail safe function: If trouble occurs in the pressure sensor circuit, the ECU cuts off current to the TRAC
solenoid relay and prohibits TRAC control.
BR±134
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1104 of 4087
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±135
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