Mazda CX-9 Grand Touring 2009 Manual page 1387

If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
17
INTERMITTENT CONCERN TROUBLESHOOTING [MZI-3.7]
VIBRATION METHOD
If malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating,
perform the steps below.
NOTE:
Inspection Method for Switch Connectors or Wiring Harnesses
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
NOTE:
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.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
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.
If the engine starts and runs, perform the following steps during idle.