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Mazda CX-9 Grand Touring. Manual - part 254

DTC P0297 [MZI-3.7]

DTC P0297 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P0297 (MZI-3.7) DIAGNOSTIC PROCEDURE

INSPECT FUEL PUMP RELAY



Inspect the fuel pump relay. (See RELAY
INSPECTION .)



Is there any malfunction?

Yes

Replace the fuel pump relay, then
go to Step 10.

Go to the next step.

INSPECT FUEL PUMP



Inspect the fuel pump. (See FUEL PUMP UNIT
INSPECTION [MZI-3.7] .)



Is there any malfunction?

Yes

Replace the fuel pump unit, then go
to the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P0232
HAS BEEN COMPLETED



Verify that all disconnected connectors
reconnected.



Clear DTC from memory using M-MDS.



Start the engine.



Perform the "KOEO/KOER self-test" (See
KOEO/KOER SELF TEST [MZI-3.7].)



Is same DTC present?

Yes

Replace the PCM, then go to the
next step.

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 P0297

Vehicle over speed condition

DETECTION

CONDITION



P0297 indicates that the vehicle has been operated in a manner which
caused the engine or vehicle to exceed a calibration limit.

POSSIBLE CAUSE



Wheel slippage (water, ice, mud and snow).



Excessive engine rpm in neutral.



Vehicle drive at a high rate of speed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA

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 10:08:36 AM

Page 149

HAS BEEN RECORDED



Has FREEZE FRAME DATA
been recorded?

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.

INSPECT VEHICLE OPERATION



Check for:



Water, ice, mud and snow
causing wheel slippage.



Excessive engine speed in
N (Neutral).



Check whether the vehicle
way driven at a high rate of
speed.



Was the vehicle driven under any
of the above conditions?

Yes Vehicle is normal. Then go to the next step.

Clear DTCs and refer to "DIAGNOSTIC INDEX "

if customer had any drive ability concerns. (See

QUICK DIAGNOSTIC CHART [MZI-3.7] .)

VERIFY TROUBLESHOOTING OF
DTC P0297 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 PCM, then go to the next step. (See PCM
REMOVAL/INSTALLATION [MZI-3.7] .)

Go to the next step.

VERIFY AFTER REPAIR
PROCEDURE



Perform "AFTER REPAIR
PROCEDURE". (See AFTER

Yes

Go to the applicable DTC inspection. (See DTC
TABLE [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 10:08:36 AM

Page 150

DTC P0300 [MZI-3.7]

DTC P0300 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

REPAIR PROCEDURE [MZI-
3.7].)



Are any DTC present?

Troubleshooting completed.

DTC P0300

Random misfire detected

DETECTION

CONDITION



The PCM monitors the crankshaft position sensor input signal interval time. The
PCM calculates the change of the interval time for each cylinder. If the change of
interval time exceeds the pre-programmed criteria, the PCM detects a misfire in
the corresponding cylinder. When the engine is running, the PCM counts the
number of misfires that occurred at 200 crankshaft revolutions and 1,000
crankshaft revolutions and calculates the misfire ratio for each crankshaft
revolution. If the ratio exceeds the pre-programmed criteria, the PCM determines
that a misfire, which can damage the catalytic converter or affect emission
performance, has occurred.

POSSIBLE

CAUSE



CMP sensor malfunction



CKP sensor malfunction



Ignition coil malfunction



Ignition system malfunction



MAF sensor contamination



Excess air suction in intake air system (between MAF/IAT sensor and dynamic
chamber)



Vacuum hoses damages or improper connection



Fuel pump malfunction



Fuel pressure regulator malfunction



Fuel line clogged



Fuel filter clogged



Fuel runout



Poor quality fuel



Fuel leakage in fuel line



Insufficient compression



Variable valve timing control system improper operation



Purge solenoid valve malfunction



PCV valve malfunction



Related connector and terminal malfunction



Related wiring harness malfunction

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:36 AM

Page 151

DTC P0300 (MZI-3.7) DIAGNOSTIC PROCEDURE

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 RELATED PENDING CODE
OR STORED DTCs



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



Verify related pending code or stored
DTCs.



Are other DTCs present?

Yes

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

Go to the next step.

VERIFY CURRENT INPUT SIGNAL
STATUS (KEY TO ON/IDLE)



Access APP1, APP2, APP3, ECT,
IAT, MAF, RPM, TP_REL and VSS
PIDs using the M-MDS. (See PCM
INSPECTION [MZI-3.7] .)



Is there any signal that is far out of
specification when the ignition
switch is in the ON position and
engine runs at idle?

Yes

Inspect the suspected circuit or part or both
according to inspection results.
(See PCM INSPECTION [MZI-3.7] .)
Then go to Step 18.

Go to the next step.

VERIFY CURRENT INPUT SIGNAL
STATUS UNDER TROUBLE
CONDITION



Inspect the same PIDs as in Step 4
when simulating the FREEZE
FRAME DATA condition.



Is there any signal which causes
drastic changes?

Yes

Inspect the suspected circuit or part or both
according to inspection results.
(See PCM INSPECTION [MZI-3.7] .)
Then go to Step 18.

Go to the next step.

Inspect the installation condition for damage to
the timing belt and gears, and repair

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:36 AM

Page 152

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