Mazda CX-9 Grand Touring 2009 Manual page 1400

Reconnect the spark plugs to the ignition
coil.
3
Ground the spark plugs to the engine.
Is a strong blue spark visible at each
cylinder while cranking?
Inspect the following wiring harnesses
for open or short:
Ignition coil No.1 terminal C-PCM
terminal 2A
Ignition coil No.2 terminal C-PCM
terminal 2F
Ignition coil No.3 terminal C-PCM
4 terminal 2K
Ignition coil No.4 terminal C-PCM
terminal 2W
Ignition coil No.5 terminal C-PCM
terminal 2AA
Ignition coil No.6 terminal C-PCM
terminal 2AE
Are the wiring harnesses normal?
Measure the voltage at terminal A in each
5 ignition coils.
Is the voltage B+?
Verify continuity between each ignition coils
6 terminal B and battery negative post.
Is there any continuity?
Does the PCM connector or ignition coil
7
connectors have poor connection?
Are the following parts normal?
8
CKP sensor and crankshaft pulley
PURGE CONTROL SYSTEM INSPECTION
If simulation function of the M-MDS is used:
1. Start the engine.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Yes Ignition system is normal.
Some cylinders do not spark:
Go to the next step.
No
All cylinders do not spark:
Go to Step 5.
Inspect and replace the ignition coil.
Yes (See IGNITION COIL INSPECTION
[MZI-3.7] .)
Repair or replace the malfunctioning part,
No
then go to Step 1.
Yes Go to the next step.
No Inspect power supply circuit of ignition coils.
Yes Go to the next step.
No Inspect GND circuit of ignition coils.
Repair or replace the connector, then go to
Yes
Step 1.
No Go to the next step.
Inspect for open or short circuit in wiring
Yes
harness and connector of CKP sensor.
Repair or replace the malfunctioning part,
No
then go to Step 1.