Maintenance Of The ABS Motor Relay
Fragment manuala — str. 603
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ABS (ANTI-LOCK BRAKE SYSTEM)
EAS27770
MAINTENANCE OF THE ABS ECU NOTE:
Measure the resistance of the front brake, rear
Checking the ABS ECU brake, and unified brake system solenoid
1. Check: valves.
• Terminals “1” of the ABS ECU ▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
Cracks/damages → Replace the ABS ECU. a. Connect the pocket tester (Ω × 1) to the sole-
• Terminals “2” of the ABS ECU couplers noid valve terminals as shown.
Connection defective, contaminated, come-
off → Correct or clean. Pocket tester
NOTE:
90890-03112
Analog pocket tester
If the ABS ECU couplers are clogged with mud YU-03112-C
or dirt, clean with compressed air.
Rear brake solenoid valve
• Positive tester probe →
terminal “1”
• Negative tester probe →
terminal “2”
Front brake solenoid valve
• Positive tester probe →
terminal “3”
1 • Negative tester probe →
2 terminal “4”
Unified brake system solenoid valve
EAS27780
• Positive tester probe →
MAINTENANCE OF THE ABS MOTOR terminal “5”
RELAY • Negative tester probe →
terminal “6”
Checking the ABS motor relay
1. Check:
• ABS motor relay
Refer to “CHECKING THE ABS MOTOR RE-
LAY” on page 8-223.
EAS22770
MAINTENANCE OF THE HYDRAULIC UNIT
Checking the hydraulic unit (solenoid valve
resistance and ABS motor continuity)
EC3P61016 b. Measure the solenoid valve resistance.
CAUTION: ▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
When checking the hydraulic unit solenoid 2. Check:
valves and ABS motor, do not remove the • Solenoid valve insulation
brake hoses. Continuity → Replace the hydraulic unit.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
1. Check: a. Connect the pocket tester (Ω × 1k) to the so-
• Solenoid valve resistance lenoid terminal and negative battery terminal.
Out of specification → Replace the hydraulic
unit. Pocket tester
90890-03112
Solenoid valve resistance Analog pocket tester
2.96–3.20 Ω at 20 °C (68 °F) YU-03112-C
8-132