Symptom Troubleshooting - Engine: NVH Mazda 3 BK

VIBRATION METHOD

1. If malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform the steps below. NOTE: There are several reasons vehicle or engine vibration could cause an electrical malfunction. Inspect the following: Connectors not fully seated. Wiring harnesses not having full play. Wiring harnesses laying across brackets or moving parts. Wiring harnesses 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 such as through the firewall and body panels are the major areas to be checked.

Scheme 526

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
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 PID value is unstable, inspect for poor connection.

Scheme 527

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
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 PID value is unstable, inspect for poor connection.