Mazda CX-9 Grand Touring. Manual — part 257

DIAGNOSTIC PROCEDURE

DTC P0315 (MZI-3.7) DIAGNOSTIC PROCEDURE

monitor.

POSSIBLE CAUSE



Crankshaft pulse wheel teeth malfunction



CKP 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 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.

No

Go to the next step.

3

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].)

No

Go to the next step.

4

INSPECT PHYSICAL CONDITION OF
CRANKSHAFT PULSE WHEEL



Inspect the crankshaft pulse wheel for
damaged teeth.



Inspect the crankshaft pulse wheel for
wobble.

NOTE:



DTC P0315 is set when the PCM is
unable to learn and correct for the
mechanical variations in the
crankshaft pulse wheel tooth spacing
(the allowable correction tolerances
are exceeded).

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 161

© 2005 Mitchell Repair Information Company, LLC.

DTC P0320 [MZI-3.7]

DTC P0320 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES



Check for a loose crankshaft pulse
wheel.



Check the CKP sensor for damage.



Are the CKP sensor and crankshaft
pulse wheel normal?

No

Repair if necessary. Then go to Step 6.

5

INSPECT DAMPER AND PULLEY
ASSEMBLY



Observe the crank pulley for wobble.



Examine the El pulse ring fastened to
the harmonic dampener.



Does the crank pulley wobble or is the
pulse ring loose or damaged?

NOTE:



This step is for engines that have
damper mounted pulse rings.
Remove the front cover if necessary
to observe the crank pulley.

Yes

Disconnect the negative battery terminal for 5
min to allow the PCM to learn the new profile.
Install a new pulley or damper assembly. Then
go to the next step.

No

Go to the next step.

6

VERIFY TROUBLESHOOTING OF DTC
P0315 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.

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:37 AM

Page 162

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P0320 (MZI-3.7) DIAGNOSTIC PROCEDURE

DTC P0320

Ignition/distributor engine speed input circuit

DETECTION

CONDITION



The ignition engine speed sensor input signal to the PCM is continuously
monitored.



The test fails when the signal indicates that 2 successive erratic PIP pulses
occurred.

POSSIBLE CAUSE



Loose wires/connectors.



Arcing secondary ignition components (coil, wires or plugs).



On-board transmitter (2-way radio).

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS

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 10:08:37 AM

Page 163

© 2005 Mitchell Repair Information Company, LLC.

1

BEEN RECORDED



Has FREEZE FRAME DATA been
recorded?

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 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.

No

Go to the next step.

3

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].)

No

Go to the next step.

4

INSPECT CKP SENSOR SIGNAL SENT TO
PCM



Disable the inertia switch.



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



Access the PCM and monitor the RPM
PID.



Crank the engine.



Is the engine speed more than 150 rpm?

NOTE:



The battery should be fully charged and
the starting system should be
functioning properly.

Yes Go to Step 13.

No

Go to the next step.

5

INSPECT TIMING COVER, CKP SENSOR
AND EXTERNAL TRIGGER WHEEL
(OUTSIDE TIMING COVER) FOR
OBVIOUS PHYSICAL DAMAGE



Visually check the timing cover, CKP
sensor and external trigger wheel (outside
the timing cover) for obvious physical
damage.



Do any parts appear physically damaged?

Yes Repair if necessary. Then go to Step 13.

No

Go to Step.

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:37 AM

Page 164

© 2005 Mitchell Repair Information Company, LLC.