ABS (ANTI-LOCK BRAKE SYSTEM)
8-120
EAS27770
MAINTENANCE OF THE ABS ECU
Checking the ABS ECU
1. Check:
• Terminals “1” of the ABS ECU
Cracks/damages → Replace the ABS ECU.
• Terminals “2” of the ABS ECU couplers
Connection defective, contaminated, come-
off → Correct or clean.
NOTE:
If the ABS ECU couplers are clogged with mud
or dirt, clean with compressed air.
EAS27780
MAINTENANCE OF THE ABS MOTOR
RELAY
Checking the ABS motor relay
1. Check:
• ABS motor relay
Refer to “CHECKING THE ABS MOTOR RE-
LAY” on page 8-159.
EAS22770
MAINTENANCE OF THE HYDRAULIC UNIT
Checking the hydraulic unit (solenoid valve
resistance and ABS motor continuity)
CAUTION:
EC3P61016
When checking the hydraulic unit solenoid
valves and ABS motor, do not remove the
brake hoses.
1. Check:
• Solenoid valve resistance
Out of specification → Replace the hydraulic
unit.
NOTE:
Measure the resistance of the front brake, rear
brake, and unified brake system solenoid
valves.
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Connect the pocket tester (Ω × 1) to the sole-
noid valve terminals as shown.
b. Measure the solenoid valve resistance.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
2. Check:
• Solenoid valve insulation
Continuity → Replace the hydraulic unit.
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Connect the pocket tester (Ω × 1k) to the so-
lenoid terminal and negative battery terminal.
Solenoid valve resistance
2.96–3.20 Ω at 20 °C (68 °F)
1
2
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Rear brake solenoid valve
• Positive tester probe →
terminal “1”
• Negative tester probe →
terminal “2”
Front brake solenoid valve
• Positive tester probe →
terminal “3”
• Negative tester probe →
terminal “4”
Unified brake system solenoid valve
• Positive tester probe →
terminal “5”
• Negative tester probe →
terminal “6”
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
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