Mazda CX-9 Grand Touring. Manual — part 303

DTC P1501 [MZI-3.7]

DTC P1501 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P1501 (MZI-3.7) DIAGNOSTIC PROCEDURE

4



Perform the "KOEO or KOER self-
test" using the M-MDS.

(See KOEO/KOER SELF TEST
[MZI-3.7].)



Is the PENDING CODE for the DTC
present?

No

Go to the next step.

5

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].)

No

Troubleshooting completed.

DTC P1501

Vehicle speed sensor (VSS) out of self-test range

DETECTION

CONDITION



Indicates that the vehicle speed input signal is out of the self-test range. If the
PCM detects a vehicle speed input signal any time during the self-test, DTC
P1501 is set and the test aborts.

POSSIBLE

CAUSE



Noise on the vehicle speed input signal from radio frequency
interference/electro magnetic interference



External sources, such as ignition wires, the charging circuit, or aftermarket
equipment

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

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.

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 345

© 2005 Mitchell Repair Information Company, LLC.

DTC P1633 [MZI-3.7]

DTC P1633 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

available?

3

VERIFY STORED DTC IN DSC/RSC
HU/CM



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



Verify stored DTCs in DSC/RSC
HU/CM.



Are DTCs stored?

Yes

Go to the appropriate DTC inspection. (See
ON-BOARD DIAGNOSIS [DSC/RSC] .)

No

Go to the next step.

4

VERIFY TROUBLESHOOTING OF
DTC P1501 HAS BEEN COMPLETED



Verify that all disconnected connectors
reconnected.



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



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



Is the PENDING CODE for the 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.

5

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].)

No

Troubleshooting completed.

DTC P1633

Keep alive power voltage too low

DETECTION CONDITION



Indicates the keep alive power circuit has experienced a voltage
interrupt.

POSSIBLE CAUSE



Connector or terminal malfunction



Open circuit between battery positive terminal and PCM terminal 1
BB

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 346

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P1633 (MZI-3.7) DIAGNOSTIC PROCEDURE

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED

Yes Go to the next step.

No

Record FREEZE FRAME DATA on the repair

2008 Mazda CX-9 Grand Touring

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

Microsoft

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

Page 347

© 2005 Mitchell Repair Information Company, LLC.



Has FREEZE FRAME DATA been
recorded?

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

INSPECT BATTERY TERMINAL AND
PCM CONNECTOR FOR POOR
CONNECTION



Turn the ignition switch off.



Disconnect battery terminal and PCM
connector.



Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).



Is there any malfunction?

Yes

Repair or replace suspected part, then go to
Step 5.

No

Go to the next step.

4

INSPECT KEEP ALIVE POWER
CIRCUIT FOR OPEN CIRCUIT



Turn the ignition switch off.



Disconnect battery cables.



Disconnect PCM connector.



Check continuity between battery
positive terminal (harness-side) and
PCM terminal 1BB (wiring harness-
side).



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to the

next step.

5

VERIFY TROUBLESHOOTING OF DTC
P1633 HAS BEEN COMPLETED



Make sure to reconnect all
disconnected connectors.



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



Start the engine.



Is the same 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.

6

VERIFY AFTER REPAIR PROCEDURE



Perform the "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 10:08:41 AM

Page 348

© 2005 Mitchell Repair Information Company, LLC.