GND SYSTEM INSPECTION FOR THERMISTOR TYPE
z
Confirm that terminal sensor #3 is at
0 V
.
{
If it is at
0 V
, inspect the sensor. If necessary, replace the sensor.
{
If not, inspect for the following:
z
Open circuit in wiring harness
z
Female terminal opening is loose.
z
Coupler (pin holder) damage
z
Pin discoloration (blackness)
z
Harness/pin crimp is loose or disconnected.
MAIN RELAY OPERATION INSPECTION
1. Verify that the main relay clicks when the ignition switch is turned to ON position and off.
z
If there is no operation sound, inspect the following:
Main relay (see
RELAY INSPECTION
.)
Harness and connector between battery and main relay terminal A.
Harness and connector between PCM terminal 1Q and main relay terminal E.
ELECTRONIC THROTTLE CONTROL SYSTEM INSPECTION
Engine coolant temperature compensation inspection
1. Connect the M-MDS to the DLC-2.
2. Access the following PIDs:
z
ECT
z
IAT
z
RPM
3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
z
If the engine speed does not decrease or decreases slowly, inspect the following:
CHT sensor and related wiring harness
(see
CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.5].
)
Electronic throttle body and related wiring harness
(see
THROTTLE BODY INSPECTION [MZI-3.5]
.)
Load compensation inspection
1. Start the engine and idle it.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:38 AM
Page 102
© 2005 Mitchell Repair Information Company, LLC.