Diagnostic Procedure
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STEP
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INSPECTION
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ACTION
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|---|---|---|---|
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1
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INSPECT PUMP MOTOR
• Turn the ignition switch to the ON position.
• Is the pump motor normal?
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Yes
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• Replace the ABS CM.
(See ABS CM REMOVAL/INSTALLATION.)
Clear the DTC and perform the self-test.
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No
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• Go to the next step.
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2
|
INSPECT PUMP MOTOR OPERATION
• Connect the WDS or the equivalent.
• Turn the ignition switch to the ON position.
• Set the ABS simulation function to PMP_MOTOR ON.
• Does the pump motor operate?
|
Yes
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• Clear the DTC from the memory. Inspect the ABS warning light (yellow) while driving the vehicle at more than 32 km/h {20 mph} and no brakes applied until the vehicle exceeds 32 km/h {20 mph}. If the ABS warning light (yellow) illuminates, replace the ABS CM with a new one.
(See ABS CM REMOVAL/INSTALLATION.)
Clear the DTC and perform the self-test.
|
|
No
|
• Go to the next step.
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3
|
INSPECT PUMP MOTOR
• Turn the ignition switch off.
• Disconnect the ABS HU/CM connectors.
• Connect a fused 50 A jumper wire between the positive battery terminal and the ABS HU/CM terminal. Connect a jumper wire between the negative battery terminal and the ABS HU/CM terminal.
• Does the pump motor operate?
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Yes
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• Go to the next step.
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No
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• Replace the ABS HU/CM and perform the self-test.
(See ABS HU REMOVAL/INSTALLATION.)
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4
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INSPECT ABS HU/CM TERMINAL B VOLTAGE
• Turn the ignition switch off.
• Disconnect the ABS HU/CM connectors.
• Turn the ignition switch to the ON position.
• Measure the resistance between the ABS HU/CM terminal B and ground.
• Is the voltage more than 10 V?
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Yes
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• Go to the next step.
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No
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• Repair or replace the wiring harness. Clear the DTC from the memory and perform the self-test.
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5
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INSPECT ABS HU/CM TERMINAL C AND D FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Measure the resistance between the ABS HU/CM terminal C and ground, and between the ABS HU/CM terminal D and ground.
• Is the resistance less than 5 ohms?
|
Yes
|
• Replace the ABS CM.
(See ABS CM REMOVAL/INSTALLATION.)
Clear the DTC from the memory and perform the self-test.
|
|
No
|
• Repair or replace the wiring harness. Clear the DTC from the memory and perform the self-test.
|
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