Symptom Troubleshooting (ABS): NVH Mazda 3 BK

Vibration method

1. 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.

Scheme 25

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

Scheme 26

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 PIDs for the switch you are inspecting.
4. Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID. If the PID value is unstable, inspect poor connection.