Intermittent Concern Troubleshooting [Z6]; Vibration Method; Inspection Method For Switch Connectors Or Wiring Harnesses - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- If vehicle not repaired or additional diagnostic information not available, replace PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION

INTERMITTENT CONCERN TROUBLESHOOTING [Z6]

Vibration Method

1. If 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 vehicle or engine vibration could cause an electrical malfunction.
Some of the things to inspect for are:
- 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 through the
fire wall, body panels, etc. are the major areas to be inspected.

Inspection Method for Switch Connectors or Wiring Harnesses

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position. (Engine off).
Note
• If engine starts and runs, perform the following steps during 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 PID value is unstable, inspect for poor connection.
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[Z6].)
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