Mazda CX-9 Grand Touring 2009 Manual page 1321

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position
12 (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Attempt to start engine at part throttle.
13
Does engine run smoothly at part throttle?
Connect the M-MDS to the DLC-2.
Access RPM PID.
14
Is RPM PID indicating engine speed
during engine cranking?
Visually inspect CKP sensor and teeth of
2008 Mazda CX-9 Grand Touring
Yes
No
Yes
No
Yes
No
DTC is displayed:
Go to appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
Communication error message is
displayed:
Inspect for the following:
Open circuit in wiring harness
between main relay and PCM
terminal 1 BO or 1BJ
Open main relay GND circuit
Main relay is stuck open.
Open or short circuit in wiring
harness between the DLC-2 and
PCM terminals 1BL or 1BG
Open or poor GND circuit (PCM
terminal 1D, 1J, 1BP, 1BK)
Poor connection of vehicle body
GND
No DTC is displayed:
Go to the next step.
Inspect electronic throttle control system
operation.
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.7].)
Go to the next step.
Go to the next step.
Inspect for the following:
Open or short circuit in CKP sensor
Open or short circuit in wiring
harness between CKP sensor
terminal A and PCM terminal 2P
Open or short circuit in wiring
harness between CKP sensor
terminal B and PCM terminal 2T
Open or short circuit in CKP sensor
wiring harnesses
If CKP sensor and wiring harness are
normal, go to the next step.