Diagnostic procedure
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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 POWER SUPPLY VOLTAGE USING WDS OR EQUIVALENT
• Turn the ignition switch off.
• Connect the WDS or equivalent to the DLC-2.
• Turn the ignition switch to the ON position (engine off).
• Access B+ PID.
• Is the voltage normal?
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Yes
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Malfunction may be temporary. Go to Step 8.
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No
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Go to the next step.
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2
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INSPECT BATTERY
• Inspect the battery.
(See BATTERY INSPECTION [ZY].)
• Is it 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 battery, then go to Step 8.
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3
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INSPECT GENERATOR
• Inspect the generator.
(See GENERATOR INSPECTION [ZY].)
• Is it 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 generator, then go to Step 8.
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4
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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 malfunction connector wiring harness, then go to Step 8.
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5
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INSPECT EPS CM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Disconnect the battery positive terminal.
• Inspect for continuity between EPS CM terminal 2A and battery positive terminal.
• 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 EPS CM terminal 2A and battery, then go to Step 8.
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6
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INSPECT EPS CM POWER SUPPLY CIRCUIT FOR SHORT TO POWER
• Disconnect the battery positive terminal.
• Measure the voltage between EPS CM terminal 2A 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 EPS CM terminal 2A and battery, then go to Step 8.
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No
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Go to the next step.
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7
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INSPECT EPS CM POWER SUPPLY CIRCUIT FOR SHORT TO GROUND
• Disconnect the battery positive terminal.
• Inspect for continuity between EPS CM terminal 2A 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 EPS CM terminal 2A and battery, then go to the next step.
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No
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Go to the next step.
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8
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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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7
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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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