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Mazda CX-9 Grand Touring. Manual - part 225

DIAGNOSTIC PROCEDURE

DTC P0012 (MZI-3.7) DIAGNOSTIC PROCEDURE

calibrated value or remains in a retarded position.

POSSIBLE

CAUSE



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

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED



Has FREEZE FRAME DATA been
recorded?

Yes Go to the next step.

Record FREEZE FRAME DATA on the

repair order, then go to the next step.

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY



Verify related Service Bulletins and/or
on-line repair information availability.



Is any related Service Bulletins
available?

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, go to the
next step.

Go to the next step.

VERIFY ENGINE OIL PRESSURE



Start the engine.



Does the oil pressure warning light
illuminate?

Yes

Inspect the engine oil pressure, then go to
Step 6. (See OIL PRESSURE
INSPECTION [MZI-3.7] .)

Go to the next step.

VERIFY TIMING CHAIN
INSTALLATION



Stop the engine.



Remove the front cover.



Is the camshaft timing mark at the
correct point?

(See TIMING CHAIN
REMOVAL/INSTALLATION [MZI-
3.7] .)

Yes Go to the next step.

Reinstall the timing chain, then go to Step 6.

INSPECT OCV (RH)



Inspect the OCV (RH).

(See OIL CONTROL VALVE (OCV)

Yes

Replace the OCV (RH), then go to the next
step.

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:08:34 AM

Page 33

DTC P0016, P0018 [MZI-3.7]

DTC P0016, P0018 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P0016, P0018 (MZI-3.7) DIAGNOSTIC PROCEDURE

INSPECTION [MZI-3.7] .)



Is there any malfunction?

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC
P0012 COMPLETED



Make sure to reconnect all disconnected
connectors.



Clear the DTC from the PCM memory
using the M-MDS.



Turn the ignition switch off.



Start the engine and warm it up
completely.



Is the PENDING CODE for this DTC
present?

Yes

Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
[MZI-3.7] .)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE



Perform the "AFTER REPAIR
PROCEDURE".

(See AFTER REPAIR PROCEDURE
[MZI-3.7].)



Are any DTCs present?

Yes

Go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7].)

Troubleshooting completed.

DTC P0016

P0016: CKP-CMP sensor (RH) correlation

DTC P0018

P0018: CKP-CMP sensor (LH) correlation

DETECTION

CONDITION



The PCM monitors the variable valve timing position for a misalignment
between the camshaft and crankshaft. The test fails when the misalignment is
more than 1 tooth.

POSSIBLE CAUSE



OCV malfunction



Camshaft advanced mechanism binding



Improper valve timing

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED

Yes Go to the next step.

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:08:34 AM

Page 34



Has FREEZE FRAME DATA been
recorded?

Record the FREEZE FRAME DATA on the

repair order, then go to the next step.

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY



Verify related Service Bulletins and/or
on-line repair information availability.



Is any related Service Bulletins
available?

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, go to the
next step.

Go to the next step.

VERIFY RELATED PENDING AND
STORED DTC



Turn the ignition switch off, then to the
ON position (Engine off)



Verify pending and stored DTCs using
M-MDS.



Is other DTC present?

Yes

Go to the appropriate DTC troubleshooting.
(See DTC TABLE [MZI-3.7].)

Go to the next step.

VERIFY CURRENT INPUT SIGNAL
STATUS



Start the engine and warm up
completely.



Access VT ACT1 (P0016) or VT ACT2
(P0018) PID using the M-MDS.



Is PID reading normal?



-14-46°

Yes Go to the next step.

Replace the OCV, then go to Step 6. (See OIL

CONTROL VALVE (OCV)

REMOVAL/INSTALLATION [MZI-3.7] .)

VERIFY TIMING CHAIN
INSTALLATION



Stop the engine.



Remove the front cover.



Is the camshaft timing mark at the
correct point?

(See TIMING CHAIN
REMOVAL/INSTALLATION [MZI-
3.7] .)

Yes Go to the next step.

Reinstall the timing chain, then go to the next

step.

VERIFY TROUBLESHOOTING OF DTC
P0016, P0018 HAS BEEN COMPLETED



Make sure to reconnect all disconnected
connectors.



Turn the engine switch to the ON

Yes

Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
[MZI-3.7] .)

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:08:34 AM

Page 35

DTC P0020 [MZI-3.7]

DTC P0020 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

position.



Clear the DTC from the PCM memory
using the M-MDS.



Start the engine.



Is the same DTC present?

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE



Perform the "AFTER REPAIR
PROCEDURE".

(See AFTER REPAIR PROCEDURE
[MZI-3.7].)



Are any DTCs present?

Yes

Go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7].)

Troubleshooting completed.

DTC P0020

CMP actuator circuit open (LH)

DETECTION

CONDITION



The PCM monitors the OCV (LH) circuit to the PCM for high and low voltage. The
test fails if the voltage exceeds or falls below a calibrated limit for a calibrated
amount of time.

POSSIBLE CAUSE



OCV (LH) malfunction



Connector or terminal malfunction



Open circuit between OCV (LH) terminal A and main relay No.1 terminal D



Open circuit between OCV (LH) terminal B and PCM terminal 2BK



Short to ground circuit between OCV (LH) terminal B and PCM terminal 2BK



Short to power supply between OCV (LH) terminal B and PCM terminal 2BK

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:08:34 AM

Page 36

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