Mazda CX-9 Grand Touring 2009 Manual page 897

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
DTC P0012 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
Has FREEZE FRAME DATA been
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Verify related Service Bulletins and/or
2
on-line repair information availability.
Is any related Service Bulletins
available?
VERIFY ENGINE OIL PRESSURE
Start the engine.
3
Does the oil pressure warning light
illuminate?
VERIFY TIMING CHAIN
INSTALLATION
Stop the engine.
Remove the front cover.
4
Is the camshaft timing mark at the
correct point?
(See TIMING CHAIN
REMOVAL/INSTALLATION [MZI-
3.7] .)
INSPECT OCV (RH)
5
Inspect the OCV (RH).
(See OIL CONTROL VALVE (OCV)
2008 Mazda CX-9 Grand Touring
calibrated value or remains in a retarded position.
OCV (RH) malfunction
Low engine oil pressure
Spool valve in the OCV (RH) is stuck in retard position
Improper valve timing due to timing chain slippage
INSPECTION ACTION
Yes Go to the next step.
Record FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform repair or diagnosis according to the
available Service Bulletins.
Yes
If the vehicle is not repaired, go to the
next step.
No Go to the next step.
Inspect the engine oil pressure, then go to
Yes Step 6. (See OIL PRESSURE
INSPECTION [MZI-3.7] .)
No Go to the next step.
Yes Go to the next step.
No Reinstall the timing chain, then go to Step 6.
Replace the OCV (RH), then go to the next
Yes
step.