Mazda CX-9 Grand Touring 2009 Manual page 1390

2. Turn the ignition switch to the ON position (Engine off).
NOTE:
3. Access PIDs for sensor or switch if you are inspecting sensors or switches.
4. If you are inspecting the switch, turn it on manually.
5. Spray water onto the vehicle or run it through a car wash.
If PID value is unstable or malfunction occurs, repair or replace part if necessary.
Fig. 12: Water Sprinkling Method
Courtesy of MAZDA MOTORS CORP.
ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7]
INPUT SIGNAL SYSTEM INSPECTION PROCEDURE
1. Find an irregular signal. (See FINDING IRREGULAR SIGNALS.)
2. Locate source. (See LOCATING THE SOURCE OF UNUSUAL SIGNALS.)
3. Repair or replace the malfunctioning part.
4. Confirm that the irregular signal is no longer detected.
Finding irregular signals
While referring to, use the PID/DATA monitor and record function to inspect the input signal system relating to
the problem.
1. Start the engine and idle the vehicle. You can assume that any signals that are out of specification by a
wide margin are irregular.
2. When recreating the problem, any sudden change in monitor input signals that is not intentionally created
by the driver can be determined as irregular.
Locating the source of unusual signals
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
If the engine starts and runs, perform the following steps at idle.