PRECAUTION[AJ (3.0L Duratec)]

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Inspection/Verification

1.  Verify the customer concern by applying the brakes under different conditions.

2.  Visually inspect for obvious signs of mechanical and electrical malfunction.

•  Mechanical malfunction

―  Parking brake cable

―  Tire pressure

―  Tire size or mismatched tires

•  Electrical malfunction

―  ABS fuse (25 A)

―  ABS fuse (60 A)

―  ABS/ASC fuse (5 A)

―  Connectors or connections

―  Harness routing

―  Wire chafing

―  Open circuit or short circuit

―  Indicator bulb

3.  If the cause of malfunction is not detected by visual inspection, connect the M-MDS, and perform DTC inspection.

4.  If any DTC related to the malfunction is read, refer to the DTC TABLE and continue malfunction diagnosis. (See ON-BOARD DIAGNOSIS[AJ (3.0L Duratec)].)

5.  If any DTC related to the malfunction is not read, refer to the “SYMPTOM TROUBLESHOOTING CHART” and continue malfunction diagnosis. (See SYMPTOM TROUBLESHOOTING[AJ (3.0L Duratec)].)

Intermittent Concern Troubleshooting

Vibration method

•  If a malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the following steps.

Note

•  There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Inspect the following:

―  Connectors not fully seated.

―  Wiring harness not having full play.

―  Wiring harness laying across brackets or moving parts.

―  Wiring harness routed too close to hot parts.

•  An improperly routed, improperly clamped, or loose wiring harness can cause pinching between parts.

•  The connector joints, points of vibration, and places where wiring harness pass through the firewall, body panels, etc. are the major areas to be inspected.

Inspection method for switch connectors or wiring harnesses

1.  Connect the M-MDS to the DLC-2.

2.  Turn the ignition switch to the ON position (Engine OFF).

Note

•  If the engine starts and runs, perform the following steps at idle.

3.  Access PIDs for the switch you are inspecting.

4.  Turn the switch on manually.

5.  Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID.

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•  If the PID value is unstable, inspect poor connection.

Inspection method for sensor connectors or wiring harnesses

1.  Connect the M-MDS to the DLC-2.

2.  Turn the ignition switch to the ON position (Engine OFF).

Note

•  If the engine starts and runs, perform the following steps at idle.

3.  Access PIDs for the switch you are inspecting.

4.  Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID.

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•  If the PID value is unstable, inspect poor connection.

Inspection method for sensors

1.  Connect the M-MDS to the DLC-2.

2.  Turn the ignition switch to the ON position (Engine OFF).

Note

•  If the engine starts and runs, perform the following steps at idle.

3.  Access PIDs for the switch you are inspecting.

4.  Vibrate the sensor slightly with your finger.

•  If the PID value is unstable or a malfunction occurs, inspect the sensor for poor connection and/or poor mounting.

Malfunction data monitor method

1.  Perform malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.

Connector terminal inspection method

1.  Inspect the connection of each female terminal.

2.  Insert the male terminal to the female terminal and Inspect the female terminal for looseness.

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