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STEP
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INSPECTION
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ACTION
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1
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INSPECT ABS (ABS/TCS) HU/CM POWER SUPPLY FUSE
Is ABS (ABS/TCS) HU/CM ignition power supply fuse normal?
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Yes
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Go to next step.
Check for a short to ground on blown fuse's circuit.
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No
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Repair or replace as necessary.
Install appropriate amperage fuse.
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2
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS
Perform DTC inspection.
Is error message displayed regarding communication between ABS (ABS/TCS) HU/CM and WDS or equivalent?
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Yes
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If a communication error message is displayed even after inspecting according to procedure displayed on WDS or equivalent, go to step 8.
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No
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Go to next step.
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3
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INSPECT FOR DTCS IN ABS (ABS/TCS) HU/CM
Have DTCs been recorded in memory?
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Yes
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Perform inspection using appropriate DTC.
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No
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Go to next step.
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4
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INSPECT PID/DATA IN ABS (ABS/TCS) HU/CM
Inspect the following items using WDS or equivalent PID/DATA monitor function.
• ABS_LAMP (ABS warning light)
• BRAKE_ LMP (BRAKE system warning light)
• ABS_VOLT (power supply voltage)
Is ABS_LAMP and BRAKE_LMP ON after more than 4 s with ignition switch on?
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Yes
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Go to Step 7.
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No
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Go to next step.
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5
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INSPECT ABS (ABS/TCS) HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z)
Inspect the voltage for PID/DATA monitor ABS_VOLT item.
Specification: approx.10 V
Is voltage within specification?
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Yes
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Replace ABS (ABS/TCS) HU/CM (open or short in ground circuit in ABS HU/CM)
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No
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Go to next step.
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6
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INSPECT BATTERY
Is battery voltage normal?
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Yes
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Go to next step.
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No
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Inspect battery and charging system.
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7
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INSPECT CHARGING SYSTEM
Is battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling?
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Yes
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Go to next step.
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No
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Inspect charging system (drive belt tension, generator, etc.).
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*8
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INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM POWER SUPPLY AND ABS (ABS/TCS) HU/CM FOR CONTINUITY
Disconnect ABS (ABS/TCS) HU/CM connector.
Turn the ignition switch to ON.
Is voltage approx. 12 V at connector terminal Z?
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Yes
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Go to next step.
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No
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Inspect for connection of ABS (ABS/TCS) HU/CM connector securely.
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*9
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INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM GROUND FOR CONTINUITY
Turn ignition switch LOOK.
Is there continuity between connector terminal AC and ground?
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Yes
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If a malfunction error message is displayed on WDS or equivalent in Step 1 inspection, go to next step.
If a malfunction error message is not displayed on WDS or equivalent in Step 1 inspection, troubleshooting is completed.
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No
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Repair wiring harness between ABS (ABS/TCS) HU/CM and ground.
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*10
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INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC-2 FOR CONTINUITY
Is there continuity between connector terminal O, R and DLC-2?
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Yes
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Go to next step.
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No
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Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
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11
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INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC-2 FOR SHORT TO BATTERY
Is voltage approx. 12 V at connector terminal O, R?
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Yes
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Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
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No
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Go to next step.
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12
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND
Is there continuity between connector terminal O, R and ground?
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Yes
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Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
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No
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Replace ABS (ABS/TCS) HU/CM (communication circuit malfunction in ABS (ABS/TCS) HU/CM)
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