Diagnostic procedure
STEP
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INSPECTION
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ACTION
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1
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INSPECT WHETHER MALFUNCTION IS CAUSED BY POOR CONNECTION OF EPS CM OR PIN DEFORMATION
• Turn the ignition switch off.
• Inspect connection of the EPS CM and wiring harness.
• Disconnect the EPS CM connector.
• Inspect whether malfunction is caused by bent or poorly connected EPS CM connector pin.
• Are the connector connection, connector pins, and wiring harness normal?
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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 faulty connector wiring harness, then go to Step 5.
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2
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INSPECT EPS MOTOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the noise filter connector.
• Inspect for continuity between the EPS CM terminals and noise filter terminals.
• Is there continuity?
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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 for open circuit between the EPS CM and EPS motor, then go to Step 5.
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3
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INSPECT EPS MOTOR CIRCUIT FOR SHORT TO POWER
• Measure the voltage between the EPS motor terminals and ground.
• Is there any B+?
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Yes
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Repair or replace the wiring harness for short to power between the EPS CM and EPS motor, then go to Step 5.
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No
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Go to the next step.
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4
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INSPECT EPS MOTOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the EPS motor terminals and ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for short to ground between the EPS CM and EPS motor, then go to the next step.
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No
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Replace the steering gear and linkage (EPS motor), then go to the next step.
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5
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VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the memory.
(See Clearing DTCs Procedure.)
• Turn the ignition switch off.
• Start the engine.
• Is the same DTC present?
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Yes
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Replace the EPS CM, then go to the next step.
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No
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Go to the next step.
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6
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VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC Table.)
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No
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DTC troubleshooting completed.
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