Mazda 3 - Intermittent Concern Troubleshooting [Lf]; Vibration Method; Inspection Method for Switch Connectors or Wiring Harnesses

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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620
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
17
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [LF].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION [LF].)
INTERMITTENT CONCERN TROUBLESHOOTING [LF]
B3E010318881W30
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 wire 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