Symptom Troubleshooting [Steering System]: NVH Mazda 3 BM

Vibration method

1. If a malfunction occurs or becomes worse while driving on a rough road or when the 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 harnesses not having full 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 harness pass through the firewall, body panels and other panels are the major areas to be inspected.

Scheme 86

1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON (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. (Scheme 86): Shaking Connector Or Wiring Harness Vertically And Horizontally If the PID value is unstable, inspect for poor connection.

NO.2 EXCESSIVE NOISE FROM ELECTRIC POWER STEERING OIL PUMP

Note. The operation sound occurs while the power steering oil pump is operating. If the abnormal noise is heard when the steering mechanism is turned from lock to lock while the vehicle is stopped, but is not heard while driving, this is a normal operation sound and it does not indicate a malfunction.