Mazda CX-9 Grand Touring. Manual — part 247

3

INSPECT FUEL INJECTOR NO.2 CONNECTOR
FOR POOR CONNECTION



Turn the ignition switch off.



Disconnect the fuel injector No.2 connector.



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



Are there malfunction?

Yes

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

No

Go to the next step.

4

INSPECT PCM CONNECTOR FOR POOR
CONNECTION



Turn the ignition switch off.



Disconnect the PCM connector.



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



Is there malfunction?

Yes

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

No

Go to the next step.

5

INSPECT FUEL INJECTOR NO.2 POWER SUPPLY
CIRCUIT FOR OPEN CIRCUIT



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



Measure the voltage between fuel injector No.2
connector terminal B and body ground.



Is the voltage B+?

Yes Go to the next step.

No

Repair or replace suspected part,

then go to Step 8.

6

INSPECT FUEL INJECTOR NO.2 SIGNAL
CIRCUIT FOR OPEN CIRCUIT



Inspect continuity between fuel injector No.2
terminal A (wiring harness-side) and PCM terminal
2BM (wiring harness-side).



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part,

then go to Step 8.

7

INSPECT FUEL INJECTOR NO.2



Inspect the fuel injector No.2. (See FUEL
INJECTOR INSPECTION [MZI-3.7] .)



Is there any malfunction?

Yes

Replace the fuel injector No.2, then
go to the next step.

No

Go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC P0202
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

Yes

Replace the PCM, then 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 121

© 2005 Mitchell Repair Information Company, LLC.

DTC P0203 [MZI-3.7]

DTC P0203 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

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



Is same DTC present?

No

Go to the next step.

9

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 P0203

Injector circuit/open-cylinder No.3

DETECTION

CONDITION



The CCM monitors the operation of the fuel injector drivers in the PCM. The test
fails if the fuel injector circuitry is inoperative.

POSSIBLE CAUSE



Fuel injector No.3 malfunction



Connector or terminal malfunction



Open circuit between fuel pump relay and fuel injector No.3 terminal B



Open circuit between fuel injector No.3 terminal A and PCM terminal 2BF

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 122

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P0203 (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.

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.

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 123

© 2005 Mitchell Repair Information Company, LLC.

3

INSPECT FUEL INJECTOR NO.3 CONNECTOR
FOR POOR CONNECTION



Turn the ignition switch off.



Disconnect the fuel injector No.3 connector.



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



Are there malfunction?

Yes

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

No

Go to the next step.

4

INSPECT PCM CONNECTOR FOR POOR
CONNECTION



Turn the ignition switch off.



Disconnect the PCM connector.



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



Is there malfunction?

Yes

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

No

Go to the next step.

5

INSPECT FUEL INJECTOR NO.3 POWER SUPPLY
CIRCUIT FOR OPEN CIRCUIT



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



Measure the voltage between fuel injector No.3
connector terminal B and body ground.



Is the voltage B+?

Yes Go to the next step.

No

Repair or replace suspected part,

then go to Step 8.

6

INSPECT FUEL INJECTOR NO.3 SIGNAL
CIRCUIT FOR OPEN CIRCUIT



Inspect continuity between fuel injector No.3
terminal A (wiring harness-side) and PCM terminal
2BF (wiring harness-side).



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part,

then go to Step 8.

7

INSPECT FUEL INJECTOR NO.3



Inspect the fuel injector No.3. (See FUEL
INJECTOR INSPECTION [MZI-3.7] .)



Is there any malfunction?

Yes

Replace the fuel injector No.3, then
go to the next step.

No

Go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC P0203
HAS BEEN COMPLETED



Verify that all disconnected connectors
reconnected.



Clear DTC from memory using M-MDS.



Start the engine.

Yes

Replace the PCM, then 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 124

© 2005 Mitchell Repair Information Company, LLC.