Symptom Troubleshooting [Engine Control System (13B-MSP)]: NVH Mazda RX-8 I

Vibration Method

1. If a 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 why vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: 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 harnesses pass such as through the firewall and body panels are the major areas to be checked.

Scheme 469

1. Connect the WDS or equivalent to the DLC-2.
2. Turn ignition switch to 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 wiring harness a bit vertically and horizontally while monitoring the PID. If the PID value is unstable, check for poor connection.

Scheme 470

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 bit vertically and horizontally while monitoring the PID. If the PID value is unstable, check for poor connection.