Mazda CX-9 Grand Touring. Manual - part 235

DTC P0119 [MZI-3.7] 

DTC P0119 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0119 (MZI-3.7) DIAGNOSTIC PROCEDURE 



Is same DTC present?  

6

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 P0119

CHT sensor circuit intermittent/erratic

DETECTION 

CONDITION 



Indicates the ECT circuit became intermittently open or shorted while 
the engine was running.  

POSSIBLE CAUSE 



Harness malfunction  



Connector or terminal malfunction  



Low engine coolant  



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 
availability.  



Is any related Service Bulletins 
available?  

Yes

Perform repair or diagnosis according to 
available Service Bulletins. 



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

No

Go to the next step.

3

INSPECT CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect PCM connector and CHT 
sensor connectors.  



Inspect for poor connection (such as 

Yes

Repair or replace suspected part, then go to Step 
7.

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:35 AM

Page 73 

© 2005 Mitchell Repair Information Company, LLC. 

damaged, pulled-out pins, and 
corrosion).  



Is there any malfunction?  

No

Go to the next step.

4

INTERMITTENT INSPECTION  



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



Access the PCM and monitor the CHT 
PID.  



While observing the PID, perform the 
following: 



Tap on the sensor to simulate 
road shock  



Wiggle the sensor connector  



Is there a large change in the voltage 
reading?  

Yes

Inspect the CHT sensor. (See CYLINDER 
HEAD TEMPERATURE (CHT) SENSOR 
INSPECTION [MZI-3.7] .) 
Replace if necessary, then go to Step 7.

No

Go to the next step.

5

INSPECT ELECTRONIC ENGINE 
CONTROL (EEC) WIRING HARNESS  



Access the PCM and monitor the CHT 
PID.  



While observing the PID, wiggle, 
shake, and bend small sections of the 
wiring harness while working from the 
sensor to the PCM.  



Is there a large change in the voltage 
reading?  

Yes Repair if necessary, then go to Step 7.

No

Go to the next step.

6

INSPECT FOR CORRECT PCM 
OPERATION  



Disconnect the PCM connector.  



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 P0119 HAS BEEN COMPLETED  



Make sure to reconnect all 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:35 AM

Page 74 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0122 [MZI-3.7] 

DTC P0122 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

7

disconnected connectors.  



Clear the 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. (See 
PCM REMOVAL/INSTALLATION [MZI-
3.7] .)

No

Go to the next step.

8

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 P0122

TP sensor No.1 circuit low input

DETECTION 

CONDITION 



The TP sensor No.1 circuit was flagged as a concern by the PCM indicating a 
low voltage or open circuit.  

POSSIBLE CAUSE 



TP sensor No.1 malfunction  



Connector or terminal malfunction  



Open circuit between throttle body terminal F and PCM terminal 2Z  



Short to ground circuit between throttle body terminal F and PCM terminal 2Z 



Open circuit between throttle body terminal E and PCM terminal 2AH  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:35 AM

Page 75 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0122 (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 10:08:35 AM

Page 76 

© 2005 Mitchell Repair Information Company, LLC.