Mazda CX-9 Grand Touring. Manual — part 298

DTC P1289 [MZI-3.7]

DTC P1289 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

7



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?

[MZI-3.7] .)

No

Go to the next step.

8

VERIFY AFTER REPAIR PROCEDURE



Perform "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 P1289

CHT sensor circuit high input

DETECTION

CONDITION



Indicates a CHT sensor circuit open.

POSSIBLE CAUSE



Open circuit in wiring harness between CHT sensor terminal A and PCM
terminal 2AL



Open circuit in wiring harness between CHT sensor terminal B and PCM
terminal 2AN



Short to power supply in wiring harness between CHT sensor terminal B and
PCM terminal 2AN



CHT sensor malfunction



Connector or terminal malfunction

2008 Mazda CX-9 Grand Touring

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

Microsoft

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

Page 325

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P1289 (MZI-3.7) DIAGNOSTIC PROCEDURE

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.

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY

Perform repair or diagnosis according to the
available Service Bulletins.

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 326

© 2005 Mitchell Repair Information Company, LLC.

2



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



Is any related Service Bulletins
available?

Yes



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

No

Go to the next step.

3

INSPECT POOR CONNECTION OF CHT
SENSOR CONNECTOR



Turn the ignition switch off.



Disconnect CHT sensor connector.



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



Are there any malfunction?

Yes

Repair or replace suspected part, then go to
Step 8.

No

Go to the next step.

4

INSPECT CHT SENSOR SIGNAL
CIRCUIT FOR SHORT TO POWER
SUPPLY



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



Measure the voltage between CHT
sensor terminal B (wiring harness-side)
and body ground.



Is the voltage B+?

Yes

Repair or replace suspected part, then go to
Step 8.

No

Go to the next step.

5

INSPECT PCM CONNECTOR FOR
POOR CONNECTION



Disconnect the PCM connector.



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



Are there any malfunction?

Yes

Repair or replace suspected part, then go to
Step 8.

No

Go to the next step.

6

INSPECT CHT SENSOR CIRCUIT FOR
OPEN CIRCUIT



Inspect the continuity between the
following circuit:



CHT sensor terminal A (wiring
harness-side) and PCM terminal
2AL (wiring harness-side).



CHT sensor terminal B (wiring
harness-side) and PCM terminal
2AN (wiring harness-side).



Are there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to

Step 8.

INSPECT CHT SENSOR

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 327

© 2005 Mitchell Repair Information Company, LLC.

DTC P1290 [MZI-3.7]

DTC P1290 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

7



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 the next
step.

No

Go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC
P1289 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.

9

VERIFY AFTER REPAIR PROCEDURE



Perform "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 P1290

CHT sensor circuit low input

DETECTION

CONDITION



Indicates a CHT sensor circuit short to ground.

POSSIBLE CAUSE



Short to ground in wiring harness between CHT sensor terminal B and PCM
terminal 2AN



CHT sensor malfunction



Connector or terminal malfunction

2008 Mazda CX-9 Grand Touring

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

Microsoft

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

Page 328

© 2005 Mitchell Repair Information Company, LLC.