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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 IGNITION POWER SUPPLY FUSE
• Is ABS (ABS/TCS) HU/CM ignition power supply fuse okay?
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Yes
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Go to next step.
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No
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Check for a short to ground on blown fuse's circuit.
Repair or replace as necessary.
Install appropriate amperage fuse.
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2
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INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC (DATA KINK CONNECTOR-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 procedures displayed on the 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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CHECK 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.
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- ABS_LAMP (ABS warning light)
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- ABS_VOLT (power supply voltage)
• Is ABS_LAMP ON after more than 4 seconds 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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CHECK FOR OPEN CIRCUITS IN ABS (ABS/TCS) HU/CM
• Disconnect ABS (ABS/TCS) HU/CM. Connect SST (harness adapter) (vehicle harness side only).
• Use the SST (adapter harness) connector to ground ABS warning light Terminal W to body ground.
• Does ABS warning light go out with ignition switch ON?
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Yes
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Replace ABS (ABS/TCS) HU/CM (open circuit in ABS (ABS/TCS) 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 WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND INSTRUMENT CLUSTER FOR CONTINUITY
• Disconnect all instrument cluster.
• Is there continuity between SST (adapter harness) connector terminal W and instrument cluster connector (16-pin) terminal 1B?
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Yes
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Replace instrument cluster (open or short to ground in instrument cluster).
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No
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Inspect wiring harness between ABS (ABS/TCS) HU/CM (Terminal W) and instrument cluster.
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7
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INSPECT ABS (ABS/TCS) HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z)
• Check the voltage for PID/DATA monitor ABS_VOLT item.
Specification: above 10 V
• Is voltage within specification?
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Yes
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Replace ABS (ABS/TCS) HU/CM (open or short circuit to B+ in ABS (ABS/TCS) HU/CM).
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No
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Go to next step.
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8
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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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Perform inspection of battery and charging system.
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9
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INSPECT CHARGING SYSTEM
• Is battery voltage normal with electrical load (A/C, headlights, etc.) on while engine is idling?
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Yes
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Go to next step.
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No
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Perform inspection of charging system (drive belt tension, generator, etc.).
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10
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VERIFY THAT ABS (ABS/TCS) HU/CM IS CONNECTED
• Is ABS (ABS/TCS) HU/CM connector securely connected?
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Yes
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Go to Step 12.
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No
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Connect ABS (ABS/TCS) HU/CM securely, then go to next step.
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11
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS (ABS/TCS) HU/CM IS CONNECTED
• Does ABS warning light go out after more than 4 seconds with ignition switch ON?
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Yes
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Temporary poor connection in ABS (ABS/TCS) HU/CM connector.
Inspect connector and terminal.
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No
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Go to next step.
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*12
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VERIFY THAT ABS HU/CM CONNECTOR TERMINALS Z, AA AND W ARE CONNECTED
• Does malfunction symptom happen again when ABS HU/CM connector Terminals Z, AA and W are shaken while the ignition switch is ON?
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Yes
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Connect ABS HU/CM connector Terminals Z, AA and W securely, then go to next step.
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No
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Go to Step 14.
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13
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS HU/CM CONNECTOR TERMINALS Z, AA AND W ARE CONNECTED
• Does ABS warning light go out after more than 4 seconds with ignition switch ON?
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Yes
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Temporary poor connection at terminal.
Inspect ABS HU/CM connector and terminal.
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No
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Go to next step.
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*14
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INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND ABS HU/CM (TERMINAL Z) FOR CONTINUITY
• Disconnect ABS HU/CM. Connect SST (adapter harness) (vehicle harness side only).
• Is voltage approximately 12 V at SST (adapter harness) 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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Repair wiring harness between fuse block and ABS HU/CM.
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*15
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM (TERMINAL AA) AND GROUND FOR CONTINUITY
• Turn ignition switch to OFF.
• Is there continuity between SST (adapter harness) connector Terminal AA and ground?
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Yes
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If a communication error message is displayed on WDS or equivalent in Step 2 inspection, go to next step.
If a communication error message is not displayed on WDS or equivalent in Step 2 inspection, recheck malfunction symptoms.
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No
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Repair wiring harness between ABS HU/CM and ground.
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*16
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR CONTINUITY
• Is there continuity between SST (adapter harness) connector Terminal T 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 HU/CM and DLC-2.
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*17
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR SHORT TO B+
• Is voltage approximately 12 V at SST (adapter harness) connector Terminal T?
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Yes
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Repair wiring harness between ABS HU/CM and DLC-2.
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No
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Go to next step.
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*18
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR SHORT TO GROUND
• Is there continuity between SST (adapter harness) connector Terminal T and ground?
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Yes
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Repair wiring harness between ABS HU/CM and DLC-2 .
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No
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Replace ABS HU/CM (communication circuit malfunction in ABS HU/CM).
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