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Mazda CX 7. Manual - part 96

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–81

01-03

VSS

1. Measure the #1 PCM terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch to the ON

position and the engine is idling.

• If it is at 0 V or 5 V, intermittent concern exists. (See01-03-76 INTERMITTENT CONCERN

TROUBLESHOOTING[L3 WITH TC].)

• If not, inspect the following points concerning the PCM connector.

• If there is no problem, inspect for the following:

— Female terminal opening is loose.

— Coupler (pin holder) damage

— Pin discoloration (blackness)

— Wiring harness/pin crimp is loose or disconnected.

2. Measure the #2 sensor terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch to the ON

position and the engine is idling.

• If it is at 0 V or 5 V, intermittent concern exists. (See01-03-76 INTERMITTENT CONCERN

TROUBLESHOOTING[L3 WITH TC].)

• If not, inspect the following points concerning the sensor connector:

• If there is no problem, inspect for the following.

— Female terminal opening is loose.

— Coupler (pin holder) damage

— Pin discoloration (blackness)

— Wiring harness/pin crimp is loose or disconnected.

3. Confirm that the #3 terminal switch voltage is at 0 V.

• If it is at 0 V, inspect the sensor. If necessary, replace the sensor.

— If necessary, replace the sensor.

• If not, inspect for the following:

— Open circuit in wiring harness

— Female terminal opening is loose.

— Coupler (pin holder) damage

— Pin discoloration (blackness)

— Wiring harness/pin crimp is loose or disconnected.

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and then off.

• If there is no operation sound, inspect the following:

— Main relay (See09-21-4 RELAY INSPECTION.)

— Wiring harness and connector between ignition switch and main relay terminal A.

— Wiring harness and connector between PCM terminal 1AT and main relay terminal B.

PCM

INPUT

acxuuw00002367

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–82

Intake Manifold Vacuum Inspection

1. Verify air intake hoses are installed properly.
2. Start the engine and run it is idling.
3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake manifold

side.

4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.

• If not as specified, inspect the following:

Specification

More than 60 kPa {450 mmHg, 18 inHg}

Note

• Air suction can be located by the engine speed change when lubricant is sprayed on the area where

suction is occurring.

— Air suction at throttle body, charge air cooler, intake manifold and PCV valve installation points

— EGR valve (stuck open)

— Engine compression

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

Electronic Throttle Control System Inspection
Engine coolant temperature compensation inspection

1. Connect the M-MDS to the DLC-2.
2. Select the following PIDs:

• ECT

• IAT

• RPM

3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.

• If the engine speed does not decrease or decreases slowly, inspect the following:

— ECT sensor and related wiring harness

(See01-40-25 ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION[L3 WITH TC].)

— Electronic throttle body and related wiring harness

(See01-13-12 THROTTLE ACTUATOR INSPECTION[L3 WITH TC].)

Load compensation inspection

1. Start the engine and run it is idling.
2. Connect the M-MDS to the DLC-2.
3. Verify that DTC P0506 or P0507 is not displayed.

• If DTC P0506, or P0507 is displayed, perform the DTC inspection.

(See01-02-13 DTC TABLE[L3 WITH TC].)

4. Select the RPM PID.

Note

• Excludes temporary idle speed drop just after the loads are turned on.

5. Verify that the engine speed is within the specification under each load condition.

• If the load condition is not as specified, inspect the following:

— A/C switch and related wiring harness

(See07-40-13 CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)
(See07-40-16 CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

— Fan switch and related wiring harness

(See07-40-13 CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)
(See07-40-16 CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

— PSP switch and related wiring harness

(See01-40-22 POWER STEERING PRESSURE (PSP) SWITCH INSPECTION[L3 WITH TC].)

Engine speed

: When the following electrical loads are on: Headlights, rear defroster, cooling fan No.1, cooling fan No.2, and

the blower motor (2-step or more.)

Load condition

Engine speed (rpm)

P, N position

D position

No load

650— 750

575— 675

E/L operating

650— 750

600— 700

P/S operating

650— 750

A/C operating

650— 750

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–83

01-03

Throttle position (TP) sweep inspection

1. Connect the M-MDS to the DLC-2.
2. Reform the KOER self-test function.

(See01-02-10 KOEO/KOER SELF TEST[L3 WITH TC].)

3. Verify that none of the following DTCs are displayed:

• P0122, P0123, P0222, P0223, P2100, P2101, P2102, P2103, P2107, P2108, P2119, P2122, P2123,

P2127, P2128, P2135, P2138

— If any one DTC is displayed, perform the DTC inspection.

4. Access the TP_REL PID.
5. Verify that the PID reading is within the CTP value. (See01-40-6 PCM INSPECTION[L3 WITH TC].)

• If the PID reading is out of range, perform the following:

— Remove the air duct from the throttle valve body.

— Verify that the throttle valve opens when the accelerator pedal is depressed.

• If the throttle valve opens, inspect the throttle position sensor and the related wiring harness.

• If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring

harness.

6. Gradually depress the throttle pedal and verify that the PID reading increases lineally.

• If the PID reading drops momentarily, inspect the following:

— Throttle position sensor

7. Fully depress the throttle pedal and verify that the PID reading is within the WOT value. (See01-40-6 PCM

INSPECTION[L3 WITH TC].)

• If the PID reading is out of range, perform the following:

— Remove the air duct from throttle valve body with connector connected.

— Verify that the throttle valve opens when throttle pedal is depressed.

• If the throttle valve opens, inspect the throttle position sensor and the related wiring harness.

• If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring

harness.

Variable Swirl System Operation Inspection

1. Connect the M-MDS to the DLC-2.
2. Access the ECT PID.
3. Verify that the ECT PID is below 60

°C {140°F}.

4. Start the engine.
5. Inspect the rod operation under the following conditions:

Rod operation

If the rod operation is not specified, inspect as follows:

1. Perform the KOER self-test using the M-MDS and verify that DTCs No. P2004, P2006, P2009 or P2010 are not

displayed.

• If DTC No. P2004, P2006, P2009 or P2010 are displayed, perform DTC inspection.

(See01-02-13 DTC TABLE[L3 WITH TC].)

If simulation function of M-MDS is used:

1. Turn the ignition switch to the ON position. (Engine off)
2. Turn the variable swirl solenoid valve from off to on using the IMRC PID and verify that the operation sound of

the solenoid valve is heard.

• If the operation sound is not heard, replace the variable swirl solenoid valve.

(See01-13-13 VARIABLE SWIRL SOLENOID VALVE INSPECTION[L3 WITH TC].)

• If the operation sound is not heard, inspect the following:

— Vacuum hose and vacuum chamber for looseness or damage

— Shutter valve actuator

(See01-13-13 VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION[L3 WITH TC].)

— Check valve is stuck open or closed

— Shutter valve cannot move smoothly

If simulation function of M-MDS is not used:

1. Inspect variable swirl solenoid valve.

(See01-13-13 VARIABLE SWIRL SOLENOID VALVE INSPECTION[L3 WITH TC].)

• If the variable swirl solenoid valve is not normal, replace the variable swirl solenoid valve.

• If the variable swirl solenoid valve is normal, inspect the following:

— Vacuum hose and vacuum chamber for looseness or damage

— Shutter valve actuator

(See01-13-13 VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION[L3 WITH TC].)

— Check valve is stuck open or closed

— Shutter valve cannot move smoothly

Engine speed

3,750 rpm

Below

Above

Shutter valve actuator

Operate

Not operate

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–84

Fuel Injector Operation Inspection
If simulation function of M-MDS is used:

If simulation function of M-MDS is not used:

STEP

INSPECTION

ACTION

Start the engine and warm it up until normal
operating temperature.
Connect the M-MDS to DLC-2.
Select the INJ#1, INJ#2, INJ#3, and INJ#4 PIDs.
Turn the fuel injector from on to off using the
PIDs for each cylinder.
Does the engine speed drop?

Yes

Fuel injector work properly

Engine speed does not drop an any cylinder:
Go to the next steps.
Engine speed drops on some cylinders:
Go to step 3.

Perform the Main Relay Operation Inspection.
(See01-03-81 Main Relay Operation Inspection.)
Does the main relay work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts.

Inspect the fuel injector of the suspected
cylinder.
(See01-14-27 FUEL INJECTOR
INSPECTION[L3 WITH TC].)
Is the fuel injector normal?

Yes

Inspect the following for the suspected cylinder.

• Fuel injector power and/or ground systems related wiring

harness and connectors.

If all items normal replace the PCM.
(See 01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)

Replace the fuel injector.
(See 01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

Perform KOER self-test function using the M-
MDS.
(See01-02-10 KOEO/KOER SELF TEST[L3
WITH TC].)
Are DTCs P0201, P0202, P0203 and/or P0204
present?

Yes

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

Go to the next step.

Inspect the fuel injector of the suspected
cylinder.
(See01-14-27 FUEL INJECTOR
INSPECTION[L3 WITH TC].)
Is the fuel injector normal?

Yes

Inspect the following for the suspected cylinder:

• PCM terminals (pulled-out pins, corrosion)

• Fuel injector terminals (pulled-out pins, corrosion)

If all items are normal replace the PCM.
(See 01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)

Replace the fuel injector.
(See 01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

STEP

INSPECTION

ACTION

Perform the KOER self-test function using the M-
MDS.
(See01-02-10 KOEO/KOER SELF TEST[L3
WITH TC].)
Are DTCs P0201, P0202, P0203 and/or P0204
present?

Yes

Go to appropriate DTC test.
(See01-02-13 DTC TABLE[L3 WITH TC].)

Go to the next step.

Inspect the fuel injector for each cylinder.
(See01-14-27 FUEL INJECTOR
INSPECTION[L3 WITH TC].)
Is the fuel injector normal?

Yes

Go to the next step.

Replace the fuel injector.
(See 01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

Inspect the following for the suspected cylinder:

• Fuel injector power and/or ground system

related wiring harnesses and connectors.

• PCM terminals (pulled-out pins, corrosion)

• Fuel injector terminals (pulled-out pins,

corrosion)

Are all items normal?

Yes

Replace the PCM.
(See 01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)

Repair or replace malfunctioning parts.

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