Page 2329 of 2890
9. Check contact point of motor relay.
OK
Not OK
Replace motor relay.
10. Check harness between motor and motor
relay.
OK
Not OK
Repair harness/connector.
11. Check body short of motor harness.
OK
Not OK
Repair harness.
12. Check ground circuit of motor.
OK
Not OK
Repair harness/connector.
Replace hydraulic unit.
NOTE:
The check can also be made by analyzing the sensor out-
put signal with oscilloscope during the TCS sequence con-
trol operation. If the ECM female connector end gives cor-
rect value, skip steps 5 through 8.
If not, operate the TCS sequence control again and mea-
sure the value at motor sensor male connector end, with
the motor sensor connector disconnected. If the value is
OK, proceed with steps 7 through 8 above.
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Page 2330 of 2890

B4M0526
Y: TROUBLE CODE 54
1. B.SW HARD
—Break and short circuit at stroke sensor or its
wiring—
DIAGNOSIS:
Faulty stroke sensor
Faulty harness/connector
Faulty stop light switch
Faulty ABS/TCS control module
TROUBLE SYMPTOM:
ABS and TCS do not operate.
NOTE:
Operate the function F09 in select monitor TCS mode, and
read the sensor output step.
If system is normal, the output reading is 1 when brake
pedal is not depressed, and it changes from 2 to 3, 4 and
5 in accordance with the brake pedal depressing. If so, skip
check steps 1 through 5.
1. Check resistance of stroke sensor.
OK
Not OK
Replace stroke sensor.
2. Check stroke sensor operation.
OK
Not OK
Replace stroke sensor.
3. Check body short of stroke sensor.
OK
Not OK
Replace stroke sensor.
4. Check harness between stroke sensor and
ABS/TCS control module.
OK
Not OK
Repair harness/connector.
5. Check body short of stroke sensor harness.
OK
Not OK
Repair harness.
Replace ABS/TCS control module.
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Page 2331 of 2890
B4M0527
2. B.SW SOFT (G)
—Irregular value in comparison stroke sensor and
vehicle acceleration comparison—
DIAGNOSIS:
Faulty stroke sensor
Faulty harness/connector
Faulty stop light switch
Faulty ABS/TCS control module
TROUBLE SYMPTOM:
ABS and TCS do not operate.
NOTE:
Operate the function F09 in select monitor TCS mode, and
read the sensor output step.
If system is normal, the output reading is 1 when brake
pedal is not depressed, and it changes from 2 to 3, 4 and
5 in accordance with the brake pedal depressing. If so, skip
check steps 2 through 4.
1. Check correct installation of stroke sensor.
OK
Not OK
Repair stroke sensor.
2. Check resistance of stroke sensor.
OK
Not OK
Replace stroke sensor.
3. Check stroke sensor operation.
OK
Not OK
Replace stroke sensor.
4. Check harness between stroke sensor and
ABS/TCS control module.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
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Page 2332 of 2890

B4M0528
3. B.SW SOFT (B)
—Irregular value in stroke sensor and brake light
switch comparison—
DIAGNOSIS:
Faulty stroke sensor
Faulty stop light switch
Faulty harness/connector
Faulty ABS/TCS control module
TROUBLE SYMPTOM:
ABS and TCS do not operate.
NOTE:
Operate the function F09 in select monitor TCS mode, and
read the sensor output step.
If system is normal, the output reading is 1 when brake
pedal is not depressed, and it changes from 2 to 3, 4 and
5 in accordance with the brake pedal depressing. If so, skip
check steps 1 and 2 through 7.
Then, operate the function FA0 and check the stop and
brake switches by B1 LED ON/OFF. If system is normal,
LED comes on when depressing brake pedal, and goes off
when not depressing. If so, skip check steps 3 through 6.
1. Check resistance of stroke sensor.
OK
Not OK
Replace stroke sensor.
2. Check stroke sensor operation.
OK
Not OK
Replace stroke sensor.
3. Check contact point of stop light switch.
OK
Not OK
Replace stroke sensor.
4. Check body short of stop light switch.
OK
Not OK
Replace stroke sensor.
5. Check power supply of stop light switch.
OK
Not OK
Repair harness/connector.
6. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
7. Check harness between stroke sensor and
ABS/TCS control module.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
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Page 2333 of 2890

B4M0529
4. B.SW SOFT (P)
—Comparison between stroke sensor and pump
output—
DIAGNOSIS:
Faulty stroke sensor
Faulty harness/connector
Faulty pump unit in hydraulic unit
Faulty stop light switch
Faulty ABS/TCS control module
NOTE:
Operate the function F09 in select monitor TCS mode, and
read the sensor output step.
If system is normal, the output reading is 1 when brake
pedal is not depressed, and it changes from 2 to 3, 4 and
5 in accordance with the brake pedal depressing. If so, skip
check steps 2 through 4.
1. Check correct installation of stroke sensor.
OK
Not OK
Repair stroke sensor.
2. Check resistance of stroke sensor.
OK
Not OK
Replace stroke sensor.
3. Check stroke sensor operation.
OK
Not OK
Replace stroke sensor.
4. Check harness between stroke sensor and
ABS/TCS control module.
OK
Not OK
Repair harness/connector.
5. Check pump unit operation.
OK
Not OK
Replace hydraulic unit.
Replace ABS/TCS control module.
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Page 2334 of 2890
B4M0530
5. B.SW SOFT (O)
—Broken brake light switch—
DIAGNOSIS:
Faulty stop light switch
Faulty harness/connector
Faulty stroke sensor
Faulty ABS/TCS control module
TROUBLE SYMPTOM:
TCS does not operate.
NOTE:
Operate the function FA0 in select monitor TCS mode, and
check the stop and brake switches by B1 LED ON/OFF. If
system is normal, LED comes on when depressing brake
pedal, and goes off when not depressing. If so, skip check
steps 2 through 4.
1. Check correct installation of stroke sensor.
OK
Not OK
Repair stroke sensor.
2. Check contact point of stop light switch.
OK
Not OK
Replace stroke sensor.
3. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
4. Check stop light circuit.
OK
Not OK
Repair harness/connector.
Replace stop light bulb and/or fuse.
Replace ABS/TCS control module.
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Page 2335 of 2890
B4M0531
Z: TROUBLE CODE 57
FLUID LEVEL SS
—Irregular signal from fluid level sensor—
DIAGNOSIS:
Faulty fluid level sensor circuit
Faulty harness/connector
Faulty ABS/TCS control module
Faulty generator
TROUBLE SYMPTOM:
ABS and TCS do not operate.
1. Check generator function.
OK
Not OK
Repair generator.
2. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
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Page 2336 of 2890

B4M0532
AA: TROUBLE CODE 58
PRESSURE SW
—Faulty pressure switch—
DIAGNOSIS:
Faulty pressure
Faulty stop light switch
Faulty ABS/TCS control module
Faulty harness/connector
TROUBLE SYMPTOM:
TCS does not operate.
NOTE:
Check using the select monitor.
Operate the function FA0 in select monitor TCS mode. The
stop and brake switches can be checked by B1 LED
ON/OFF. If system is normal, LED comes on when
depressing brake pedal, and goes off when not depressing.
If so, skip check steps 5 through 8.
1. Check contact point of pressure switch.
OK
Not OK
Replace hydraulic unit.
2. Check body short of pressure switch.
OK
Not OK
Replace hydraulic unit.
3. Check harness between pressure switch and
ABS/TCS control module.
OK
Not OK
Repair harness/connector.
4. Check body short of pressure switch harness.
OK
Not OK
Repair harness.
5. Check contact point of stop light switch.
OK
Not OK
Replace stroke sensor.
6. Check body short of stop light switch.
OK
Not OK
Replace stroke sensor.
7. Check power supply of stop light switch.
OK
Not OK
Repair harness.
8. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
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