Mazda CX-9 Grand Touring. Manual — part 297

DTC P1285, P1299 [MZI-3.7]

DTC P1285, P1299 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P1285, P1299 (MZI-3.7) DIAGNOSTIC PROCEDURE



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



Start the engine and run it at idle.



Retrieve DTCs using the M-MDS.



Is the PENDING CODE for this
DTC present?

No

Go to the next step.

7

VERIFY AFTER REPAIR
PROCEDURE



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



Are any DTC present?

Yes

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

No

Troubleshooting completed.

DTC P1285

P1285: Cylinder head over temperature condition

DCT P1299

P1299: Cylinder head over temperature protection active

DETECTION

CONDITION



P1285 indicates that an engine overheat condition was sensed by the
CHT sensor.



P1299 indicates that an engine overheat condition was detected by the
CHT sensor.



Fail-safe function was activated to cool the engine.

POSSIBLE CAUSE



Low engine coolant level



Base engine malfunction



Engine cooling system malfunction



CHT sensor malfunction

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED



Has FREEZE FRAME DATA been recorded?

Yes Go to the next step.

No

Record FREEZE FRAME DATA on

the repair order, then go to the next

step.

2

VERIFY RELATED REPAIR INFORMATION
AVAILABILITY



Verify related Service Bulletins and/or on-line

Yes

Perform repair or diagnosis according
to the available Service Bulletins.



If the vehicle is not repaired, go

2008 Mazda CX-9 Grand Touring

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

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repair information availability.



Is any related Service Bulletins available?

to the next step.

No

Go to the next step.

3

INSPECT COOLING SYSTEM



An engine overheat condition is sensed by the
CHT sensor.



Check the cooling system for:



Correct coolant level



Internal or external coolant leaks



Blockage of the radiator



Cooling fan operation



Is the cooling system normal?

WARNING:



Never remove the cooling system cap or
loosen the radiator drain plug while the
engine is running, or when the engine and
radiator are hot. Scalding engine coolant
and steam may shoot out and cause serious
injury. It may also damage the engine and
cooling system.



Turn off the engine and wait until it is cool.
Even then, be very careful when removing
the cap. Wrap a thick cloth around it and
slowly turn it counterclockwise to the first
stop. Step back while the pressure escapes.



When you are sure all the pressure is gone,
press down on the cap using the cloth, turn
it, and remove it.

NOTE:



If the electric cooling fan does not operate,
go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7].)

Yes Go to the next step.

No

Repair if necessary. Then go to the next

step.

4

INSPECT OPERATION OF THE CHT SENSOR



Run the engine until the engine temperature
stabilizes.



Verify the radiator hoses are hot and the
cooling system is pressurized.



Verify self-test DTCs.



Is DTC P1285 present?

Yes Go to the next step.

No

An engine overheat temperature was

not detected. Repair any other DTCs if

necessary.

INSPECT CHT SENSOR

Replace the CHT sensor, then go to the

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 322

© 2005 Mitchell Repair Information Company, LLC.

DTC P1288 [MZI-3.7]

DTC P1288 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P1288 (MZI-3.7) DIAGNOSTIC PROCEDURE

5



Inspect the CHT sensor. (See CYLINDER
HEAD TEMPERATURE (CHT) SENSOR
INSPECTION [MZI-3.7] .)



Is there any malfunction?

Yes next step.

No

Go to the next step.

6

VERIFY TROUBLESHOOTING OF DTC P1285,
P1299 HAS BEEN COMPLETED



Verify that all disconnected connectors are
reconnected.



Turn the ignition switch to the ON position
(Engine off).



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



Start the engine and run it at idle.



Retrieve DTCs using the M-MDS.



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] .)

No

Go to the next step.

7

VERIFY AFTER REPAIR PROCEDURE



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



Are any DTC present?

Yes

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

No

Troubleshooting completed.

DTC P1288

CHT sensor out of self-test range

DETECTION

CONDITION



Indicates the CHT sensor is out of self-test range. The engine is not at a
normal operating temperature.

POSSIBLE CAUSE



Cold engine



Engine overheating



Connector or terminal malfunction



Low engine coolant level



CHT sensor malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED

Yes Go to 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 10:08:41 AM

Page 323

© 2005 Mitchell Repair Information Company, LLC.

1



Has FREEZE FRAME DATA been
recorded?

No

Record FREEZE FRAME DATA on the repair

order, then go to next step.

2

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY



Verify related Service Bulletins
availability.



Is any related Service Bulletins
available?

Yes

Perform repair or diagnosis according to
available Service Bulletins.



If vehicle is not repaired, go to next step.

No

Go to next step.

3

VERIFY RELATED PENDING CODE OR
STORED DTC



Verify the related PENDING CODE or
stored DTCs.



Are other DTCs present?

Yes

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

No

Go to the next step.

4

INSPECT THE COOLING SYSTEM



Inspect the vehicle coolant level.



Is the cooling system normal?

Yes Go to the next step.

No

Inspect the cooling system (overheat), the go

to Step 7.

5

INSPECT CHT SENSOR



Inspect the CHT sensor. (See
CYLINDER HEAD
TEMPERATURE (CHT) SENSOR
INSPECTION [MZI-3.7] .)



Is there any malfunction?

Yes Replace the CHT sensor, then go to Step 7.

No

Go to the next step.

6

INSPECT FOR CORRECT PCM
OPERATION



Disconnect all the PCM connectors.



Visually inspect for:



Pushed out pins



Corrosion



Connect all the PCM connectors and
verify that they seat correctly.



Retrieve DTCs using the M-MDS.



Is the PENDING CODE for this DTC
present?

Yes Go to the next step.

No

The system is correctly. Go to the next step.

VERIFY TROUBLESHOOTING OF DTC
P1288 HAS BEEN COMPLETED



Verify that all disconnected connectors
reconnected.

Yes

Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 324

© 2005 Mitchell Repair Information Company, LLC.