INTERMITTENT CONCERN TROUBLESHOOTING

Vibration Method

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

Note

• There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are:

- Connectors not fully seated.

- Wiring harnesses do not have sufficient play.

- Wires laying across brackets or moving parts.

- Wires routed too close to hot parts.

• An improperly routed, improperly clamped, or loose wiring harness can cause wiring to become pinched between parts.

• The connector joints, points of vibration, and places where wiring harnesses pass through the fire wall, body panels, etc. are the major areas to be checked.

Inspection Method for Switch Connectors or Wires

1. Connect the WDS or equivalent 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 the PIDs for the switch you are inspecting.

4. Turn the switch on manually.

5. Shake each connector or the wiring harness a little vertically and horizontally while monitoring the PID.

• If the PID value is unstable, check for a poor connection.

Inspection Method for Sensor Connectors or Wires

1. Connect the WDS or equivalent 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 the PIDs for the switch you are inspecting.

4. Shake each connector or wiring harness a little vertically and horizontally while monitoring the PID.

• If the PID value is unstable, check for a poor connection.

Inspection Method for Sensors

1. Connect the WDS or equivalent 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 the 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, check for a poor connection and/or poorly mounted sensor.

Inspection Method for Actuators or Relays

1. Connect the WDS or equivalent 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. Prepare the Output State Control for the actuators or relays that you are inspecting.

4. Vibrate the actuator or relay with your finger for 3 s until the Output State Control is activated.

• If a variable click sound is heard, check for a poor connection and/or poorly mounted actuator or relay.

Note

• Vibrating relays excessively may result in open relays.

Water Sprinkling Method

Caution

• Indirectly change the temperature and humidity by spraying water onto the front of the radiator.

• If a vehicle is subject to water leakage, the leakage may damage the control module. When testing a vehicle with a water leakage problem, special caution must be used.

If a malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps.

1. Connect the WDS or equivalent to the DLC-2 if inspecting sensors or switches.

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 the PIDs for sensor or switch if inspecting sensors or switches.

4. If you are inspecting a switch, turn it on manually.

5. Spray water onto the vehicle or run it through a car wash.

• If the PID value is unstable or a malfunction occurs, repair or replace part if necessary.