Mazda CX 7. Manual - part 67

 

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Mazda CX 7. Manual - part 67

 

 

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–223

01-02

End Of Sie

DTC P2187[L3 WITH TC]

id010239812500

18

INSPECT FUEL PRESSURE (LOW-SIDE)

• Connect the fuel pressure gauge between fuel 

pump and high pressure fuel pump.

• Measure the low side fuel pressure.

 (See01-14-5 FUEL LINE PRESSURE 
INSPECTION[L3 WITH TC].)

• Is the low side fuel pressure within the 

specified?

Yes

Go to the next step.

No

Inspect for following:

• Fuel line restriction

• Fuel filter clogging

If okay replace the fuel pump. Then go to the next step.

19

VERIFY TROUBLESHOOTING OF DTC P2178 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the PCM memory using 

the M-MDS.

• Perform the PCM Adaptive Memory Produce 

Drive Mode.
 (See01-02-10 OBD-II DRIVE MODE[L3 WITH 
TC].)

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.
 (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH 
TC].)

No

Go to the next step.

20

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

 (See01-14-4 AFTER REPAIR 
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
 (See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P2187

Fuel system too lean at idle

DETECTION 

CONDITION

• PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) during closed loop fuel 

control at idle. If the LONGFT and the sum total of these fuel trims exceed the preprogrammed criteria, the 
PCM determines that fuel system is too lean at idle.

Diagnostic support note

• This is a continuous monitor. (Fuel system)

• MIL illuminates if the PCM detects the above malfunctioning condition in two consecutive drive cycles or in 

one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction conditions during the first drive 

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• Misfire

• Front HO2S deterioration

• Front HO2S heater malfunction

• MAF sensor malfunction

• Pressure regulator malfunction

• Fuel pressure sensor malfunction

• Relief valve (built-in fuel delivery pipe) malfunction

• Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction

• High pressure fuel pump malfunction

• Fuel pump malfunction

• Fuel filter clogged or restricted

• Fuel leakage on fuel line from fuel delivery pipe and fuel pump

• Exhaust system leakage

• Purge solenoid valve malfunction

• Purge solenoid hoses improper connection

• Air suction in intake-air system

• Insufficient engine compression

• Variable valve timing control system improper operation

• PCM malfunction

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–224

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND 
DIAGNOSTIC MONITORING TEST RESULTS 
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(Fuel system related) been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS 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 repair information available?

Yes

Perform the repair or diagnosis according to the available 
repair information.

• 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 to off, then to the ON 

position (Engine off).

• Verify related pending code or stored DTCs.

• Are other DTCs present?

Yes

If misfire DTC is present, go to Step 8.
If other DTC is present, go to the applicable DTC 
inspection.
 (See01-02-13 DTC TABLE[L3 WITH TC].)

No

If driveability concern is present, go to Step 8.
If not, go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

• Is DTC P2177 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to troubleshooting procedures for DTC on FREEZE 
FRAME DATA.

5

VERIFY CURRENT INPUT SIGNAL STATUS 
(IGNITION SWITCH TO THE ON POSITION/
IDLE)

• Access the APP1, APP2, ECT, MAF and TP 

PIDs using the M-MDS.)

• Is there any signal that is far out of specification 

when the ignition switch is at the ON position 
and the engine runs?

Yes

Inspect the sensor and excessive resistance in related 
wiring harnesses.
Repair if necessary.
Then go to Step 20.

No

Go to the next step.

6

VERIFY CURRENT INPUT SIGNAL STATUS 
UNDER TROUBLE CONDITION

• Inspect the same PIDs as Step 4 while 

simulating FREEZE FRAME DATA condition.

• Is there any signal which causes drastic 

changes?

Yes

Inspect the sensor and related wiring harnesses, repair or 
replace it.
Then go to Step 20.

No

Go to the next step.

7

VERIFY CURRENT INPUT SIGNAL STATUS OF 
FRONT HO2S

• Access the O2S11 for P2177 PID using the M-

MDS.

• Check the PID under following accelerator 

pedal condition in NEUTRAL.

• Is the PID reading normal?

— –0.1— 0.1 A when idle

— Below 0.25 mA just after release of 

accelerator pedal (lean condition)

Yes

Go to the next step.

No

Visually inspect for any gas leakage between exhaust 
manifold and front HO2S.
Then go to Step 20.

8

VERIFY CURRENT INPUT SIGNAL STATUS OF 
MAF SENSOR

• Connect the M-MDS to the DLC-2.

• Start the engine.

• Access the MAF PID.

• Verify that the MAF PID changes quickly 

according to engine speed.

• Is the PID normal?

Yes

Go to the next step.

No

Replace the MAF/IAT sensor, then go to Step 20.

9

INSPECT FOR EXCESSIVE AIR SUCTION OF 
INTAKE AIR SYSTEM

• Visually inspect for loosen, cracks or damages 

hoses on intake-air system.

• Is there any malfunction?

Yes

Repair or replace the source of air suction, then go to Step 
20.

No

Go to the next step.

1871-1U-06B(01-02).fm  224 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–225

01-02

10

INSPECT PURGE SOLENOID VALVE STUCK 
OPEN

• Turn the ignition switch to off.

• Disconnect the both hoses from purge solenoid 

valve.

• Blow the air through purge solenoid valve.

• Does the air blow through?

Yes

Replace the purge solenoid valve.
Then go to Step 20.

No

Go to the next step.

11

INSPECT FUEL PRESSURE (HIGH-SIDE)

• Access and monitor FUEL_PRES PID.

• Is the FUEL_PRES PID value within the 

specified?
 (See01-40-6 PCM INSPECTION[L3 WITH 
TC].)

Yes

Go to Step 15.

No

Go to the next step.

12

IDENTIFY CAUSE BY FUEL PRESSURE 
SENSOR OR HIGH PRESSURE FUEL PUMP

• Is the vehicle accelerate performance 

normally?

Yes

Go to the next step.

No

Go to Step 14.

13

INSPECT FUEL PRESSURE SENSOR

• Inspect the fuel pressure sensor.

 (See01-40-35 FUEL PRESSURE SENSOR 
INSPECTION[L3 WITH TC].)

• Is the fuel pressure sensor normal?

Yes

Go to Step 15.

No

Replace the fuel delivery pipe, then go to Step 20.

14

INSPECT HIGH PRESSURE FUEL PUMP

• Replace the high pressure fuel pump

• Monitor FUEL_PRES PID

• Is the FUEL_PRES PID value within the 

specified?

 (See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Go to Step 20.

No

Go to the next step.

15

INSPECT FUEL PRESSURE (LOW-SIDE)

• Connect the fuel pressure gauge between fuel 

pump and high pressure fuel pump.

• Measure the low side fuel pressure.

 (See01-14-5 FUEL LINE PRESSURE 
INSPECTION[L3 WITH TC].)

• Is the low side fuel pressure within the 

specified?

Yes

Go to the next step.

No

Inspect for following:

• Fuel line restriction

• Fuel filter clogging

If okay replace the fuel pump. Then go to Step 20.

16

INSPECT IGNITION SYSTEM

• Perform the spark test.

 (See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)

• Is strong blue spark visible at each cylinder?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to 
spark test results, then go to Step 20.

17

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

 (See01-10-9 COMPRESSION 
INSPECTION[L3 WITH TC].)

• Is it normal?

Yes

Go to the next step.

No

Implement the engine overhaul for repairs, then go to Step 
20.

18

INSPECT VARIABLE VALVE TIMING CONTROL 
SYSTEM OPERATION

• Inspect the variable valve timing control system 

operation.
 (See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)

• Does the variable valve timing control system 

work properly?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to 
inspection results, then go to Step 20.

19

INSPECT FUEL INJECTOR OPERATION

• Remove the fuel injector.

• Inspect the fuel injector (resistance, injection 

amount).
 (See01-14-27 FUEL INJECTOR 
INSPECTION[L3 WITH TC].)

• Is the fuel injector normal?

Yes

Go to the next step.

No

Replace the fuel injector, then go to the next step.

STEP

INSPECTION

ACTION

1871-1U-06B(01-02).fm  225 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–226

End Of Sie

DTC P2188[L3 WITH TC]

id010239812600

Diagnostic procedure

20

VERIFY TROUBLESHOOTING OF DTC P2187 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the PCM memory using 

the M-MDS.

• Perform the PCM Adaptive Memory Produce 

Drive Mode.
 (See01-02-10 OBD-II DRIVE MODE[L3 WITH 
TC].)

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.
 (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH 
TC].)

No

Go to the next step.

21

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

 (See01-14-4 AFTER REPAIR 
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
 (See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P2188

Fuel system too rich at idle

DETECTION 

CONDITION

• PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) during closed loop fuel 

control at idle. If the LONGFT and the sum total of these fuel trims exceed the preprogrammed criteria, the 
PCM determines that fuel system is too rich at idle.

Diagnostic support note

• This is a continuous monitor. (Fuel system)

• MIL illuminates if the PCM detects the above malfunctioning condition in two consecutive drive cycles or in 

one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction conditions during the first drive 

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• Misfire

• Front HO2S deterioration

• Front HO2S heater malfunction

• MAF sensor malfunction

• Pressure regulator malfunction

• Fuel pressure sensor malfunction

• Relief valve (built-in fuel delivery pipe) malfunction

• Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction

• High pressure fuel pump malfunction

• Fuel pump malfunction

• EGR valve stuck open

• Variable swirl control improper operation

• Purge solenoid valve improper operation

• Purge solenoid valve malfunction (stuck open)

• Purge solenoid hoses improper connection

• PCV valve malfunction

• Variable valve timing control system improper operation

• PCM malfunction

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND 
DIAGNOSTIC MONITORING TEST RESULTS 
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(Fuel system related) been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS 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 repair information available?

Yes

Perform the repair or diagnosis according to the available 
repair information.

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

No

Go to the next step.

1871-1U-06B(01-02).fm  226 ページ  2006年3月15日 水曜日 午前10時32分

 

 

 

 

 

 

 

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