Mazda CX 7. Manual — part 59

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–191

01-02

End Of Sie

DTC P2096[L3 WITH TC]

id010239810800

5

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

• Turn the ignition switch to off.

• Disconnect the PCM connector.

• Inspect for poor connection at PCM terminal

2AF. (such as damaged, pulled-out pins,
corrosion).

• Is there any malfunction?

Yes

Repair terminal, then go to Step 7.

No

Go to the next step.

6

INSPECT OCV CONTROL CIRCUIT FOR SHORT
TO POWER SUPPLY

• Remove the OCV.

• Turn the ignition switch to the ON position

(Engine off).

• Measure voltage between PCM terminal 2AF

and body ground.

• Is the voltage B+?

Yes

Repair or replace the wiring harness for a short to power
supply, then go to the next step.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF DTC P2089
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC from the PCM memory using

the M-MDS.

• Turn the ignition switch to off.

• Start the engine and warm it up completely.

• 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.

8

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See01-02-10 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 P2096

Target A/F feedback system too lean

DETECTION

CONDITION

• The PCM monitors the target A/F fuel trim while under target A/F feedback control. If the fuel trim is more

than the specification, the PCM determines that the target A/F feedback system is too lean.

• Rear HO2S sensor voltage is more than 0.1 V

Diagnostic support note

• This is a continuous monitor (Fuel system).

• The MIL does not illuminate.

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

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• Exhaust gas leakage

• Rear HO2S malfunction

• IAT sensor malfunction

• ECT sensor malfunction

• Air suction in intake-air system

• Front HO2S malfunction

• MAF sensor malfunction

• Insufficient fuel line pressure

• 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

• Leakage fuel

• Improper operation ignition system

• Insufficient engine compression

• Fuel injector malfunction

• PCM malfunction

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–192

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 REPAIR INFORMATION AVAILABILITY

• Verify related service 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 DTC

• Turn the ignition switch off then to the ON

position (Engine off).

• Verify the related PENDING CODE or stored

DTCs.

• Is the DTC P2177 or P2187 also present?

Yes

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

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA

• Is DTC P2096 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to FREEZE FRAME DATA DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)

5

VERIFY CURRENT INPUT SIGNAL STATUS OF
REAR HO2S

• Connect the M-MDS to the DLC-2.

• Start the engine and warm it up completely.

• Access O2S12 PID.

• Read O2S12 PID under the following

accelerator pedal condition (in NEUTRAL).
— More than 0.45 V when accelerator pedal is

suddenly depressed (rich condition).

— Less than 0.45 V just after release of

accelerator pedal (lean condition)

• Is the PID normal?

Yes

Go to the next step.

No

Visually inspect for the exhaust gas leakage between the
TWC and rear HO2S.

• If there is no leakage, replace the rear HO2S.

(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)

Then go to Step 20.

6

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs.

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

— ECT

— MAF

— TP

— VSS

• Are the PIDs normal?

Yes

Go to the next step.

No

Inspect the malfunctioning part according to the inspection
results.
Then go to Step 20.

7

VERIFY CURRENT INPUT SIGNAL STATUS
UNDER FREEZE FRAME DATA CONDITION

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs under the FREEZE

FRAME DATA condition.
(See01-40-6 PCM INSPECTION[L3 WITH
TC].)
— ECT

— MAF

— TP

— VSS

• Are the PIDs normal?

Yes

Go to the next step.

No

Inspect the malfunctioning part according to the inspection
results.
Then go to Step 20.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–193

01-02

8

VERIFY CURRENT INPUT SIGNAL STATUS OF
FRONT HO2S

• Connect the M-MDS to the DLC-2.

• Start the engine and warm it up completely.

• Access the O2S11 PID.

• Read the O2S11 PID under following

accelerator pedal condition (in NEUTRAL).
— –0.1— 0.1A when idle.

— More than 0.25 mA just after release of

accelerator pedal (lean condition).

• Is the PID normal?

Yes

Go to the next step.

No

Visually inspect for the exhaust gas leakage between the
exhaust manifold and front HO2S.

• If there is no leakage, replace front HO2S.

(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)

Then go to Step 20.

9

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.

10

INSPECT INTAKE-AIR SYSTEM FOR
EXCESSIVE AIR SUCTION

• Visually inspect the hose in intake-air system

for looseness, cracks or damages.

• Is there any malfunction?

Yes

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

No

Go to the next step.

11

INSPECT IGNITION COIL WIRING HARNESSES

• Inspect the ignition coil related wiring harness

condition (intermittent open or short circuit) for
all cylinders.

• Are wiring harness conditions normal?

Yes

Go to the next step.

No

Repair the wiring harnesses, then go to Step 20.

12

INSPECT IGNITION SYSTEM OPERATION

• 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 result.
Then go to Step 20.

13

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

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

• Is there any malfunction?

Yes

Go to the next step.

No

Overhaul the engine, then go to Step 20.

14

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 18.

No

Go to the next step.

15

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 17.

16

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 18.

No

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

17

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.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–194

End Of Sie

DTC P2097[L3 WITH TC]

id010239810900

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 Step 20.

19

INSPECT FUEL INJECTOR

• Inspect the fuel injector.

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

• Is there any malfunction?

Yes

Replace the fuel injector, then go to the next step.
(See01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

No

Go to the next step.

20

VERIFY TROUBLESHOOTING OF DTC P2096
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”.

(See01-02-10 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 P2097

Target A/F feedback system too rich

DETECTION

CONDITION

• The PCM monitors the target A/F fuel trim while under target A/F feedback control. If the fuel trim is less

than specification, the PCM determines that the target A/F feedback system is too rich.

Diagnostic support note

• This is a continuous monitor. (Fuel system)

• MIL illuminates if the PCM detects the above malfunction 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

• Exhaust gas leakage

• Rear HO2S malfunction

• IAT sensor malfunction

• ECT sensor malfunction

• Front HO2S malfunction

• Excessive fuel line pressure

• 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

• Purge valve malfunction

• Insufficient engine compression

• PCM malfunction

1871-1U-06B(01-02).fm 194 ページ ２００６年３月１５日 水曜日 午前１０時３２分