Engine Controls - Control System [L5]: Diagnosis Mazda CX-7 I рестайлинг

PCM inspection preparation

1. Disconnect the negative battery cable.
2. Remove the battery and battery tray. (See «BATTERY REMOVAL/INSTALLATION [L5]»(ref-375359-S31806842452010102800000) .)
3. Remove the windshield wiper arm and blade. (See «WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION»(ref-375374-S11692705452010102800000) .)
4. Remove the cowl grille. (See «COWL GRILLE REMOVAL/INSTALLATION»(ref-375375-S07009167252010102800000) .)
5. Remove the windshield wiper motor. (See «WINDSHIELD WASHER MOTOR REMOVAL/INSTALLATION»(ref-375374-S25116322492010102800000) .)
6. Remove the cowl panel. (See «COWL PANEL REMOVAL/INSTALLATION»(ref-375392-S10901129492010102800000) .)
7. Remove the PCM bracket with the PCM connector still connected. (See «PCM REMOVAL/INSTALLATION [L5]»(ref-375347-S19052500852010102800000) .)
8. Install the battery and battery tray. (See «BATTERY REMOVAL/INSTALLATION [L5]»(ref-375359-S31806842452010102800000) .)
9. Connect the negative battery cable.

Terminal voltage table (Reference)

Scheme 88

TERMINAL VOLTAGE REFERENCE

Inspection Using An Oscilloscope (Reference)

Cooling fan control

PCM terminals

1. 1 R(+)-body ground(-)

Oscilloscope setting

1. 5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Scheme 89

1. Idle after warm up

APP sensor No. 2 signal

Accelerator pedal released

Scheme 90

Accelerator pedal depressed

PCM terminals

1. 1AO(+)-body ground(-)

Oscilloscope setting

1. 2.5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

Scheme 91

1. Turn the ignition switch to the ON position.

Purge control

PCM terminals

1 BA(+)-body ground(-)

Oscilloscope setting

10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 92

A/F sensor heater control

PCM terminals

2A(+)-body ground(-)

Oscilloscope setting

5 V/DIV (Y), 200 ms/DIV (X), DC range

Vehicle condition

Idle (immediately after starting the engine)

Scheme 93

HO2S heater control

PCM terminals

2B(+)-body ground(-)

Oscilloscope setting

5 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition

Idle (immediately after starting the engine)

Scheme 94

OCV control signal

PCM terminals

2E(+)-body ground(-)

Oscilloscope setting

2 V/DIV (Y), 0.8 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 95

IGT1, IGT2, IGT3, IGT4 control

PCM terminals

IGT1 (ignition coil No. 1): 2G(+)-body ground(-)

IGT2(ignition coil No. 2): 2K(+)-body ground(-)

IGT3(ignition coil No. 3): 2L(+)-body ground(-)

IGT4(ignition coil No. 4): 2H(+)-body ground(-)

Oscilloscope setting

1 V/DIV (Y), 50 ms/DIV (X), DC range

Scheme 96

Vehicle condition

1. Idle after warm up

CMP signal

PCM terminals

2S(+)-body ground(-)

Oscilloscope setting

1 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 97

CKP signal

PCM terminals

2W(+)-body ground(-)

Oscilloscope setting

1 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 98

Generator field coil control

PCM terminals

2AA(+)-body ground(-)

Oscilloscope setting

0.5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 99

Generator output voltage

PCM terminals

2AF(+)-body ground(-)

Oscilloscope setting

2 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 100

Fuel injection (#1, #2, #3, #4) control

PCM terminals

Fuel Injection No. 1: 2BB(+)-body ground(-)

Fuel Injection No. 2: 2BC(+)-body ground(-)

Fuel Injection No. 3: 2BD(+)-body ground(-)

Fuel Injection No. 4: 2AZ(+)-body ground(-)

Oscilloscope setting

10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Scheme 101

Continuity Inspection

1. Inspect the following if the power steering is inoperative (See «POWER STEERING FLUID INSPECTION»(ref-375364-S15206281142010102800000) .): Power steering fluid level Power steering fluid leakage Power steering fluid pressure
2. Disconnect the PSP switch connector.
3. Start the engine.
4. Inspect for continuity between the PSP switch terminal and ground using a tester. If not as specified, replace the PSP switch. (See «POWER STEERING OIL PUMP REMOVAL/INSTALLATION»(ref-375364-S21496230372010102800000) .)

PSP switch specification

Scheme 102

VARIABLE TUMBLE SHUTTER VALVE SWITCH INSPECTION [L5]

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition to the ON position.
3. Verify that the voltage (M-MDS PID: IMRC_POS) within the specification. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) .) If not as specified, replace the intake manifold. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L5]

1. Disconnect the negative battery cable.
2. Drain the engine coolant. (See «ENGINE COOLANT REPLACEMENT [L5]»(ref-375353-S12210369572010102800000) .)
3. Disconnect the ECT sensor connector.
4. Remove the ECT sensor. (See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S11876240342010102800000) .)
5. Place the ECT sensor in water with a thermometer, and heat the water gradually.
6. Measure the resistance between the ECT sensor terminals A and B using an ohmmeter. If not as specified, replace the ECT sensor. (See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S11876240342010102800000) .)

ECT sensor Specification

ECT RESISTANCE CHART

Scheme 103

Visual Inspection

1. Disconnect the negative battery cable.
2. Disconnect the MAF/IAT sensor connector.
3. Remove the MAF/IAT sensor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)
4. Visually inspect the MAF/IAT sensor for the following: Damage, cracks, soiling Rusted sensor terminal Bent sensor terminal If there is any malfunction, repair or replace the MAF/IAT sensor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)

Voltage Inspection

1. Remove the MAF/IAT sensor without disconnect the MAF/IAT sensor connector.
2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to the ON position.
4. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the voltage (M-MDS PID: MAF) varies. If not as verified, replace the MAF/IAT sensor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [L5]

1. Disconnect the negative battery cable.
2. Disconnect the MAF/IAT sensor connector.
3. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter. If not as specified, replace the MAF/IAT sensor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)

IAT sensor Specification

IAT RESISTANCE CHART

Scheme 104

Scheme 105

1. Disconnect the negative battery cable.
2. Disconnect the MAP sensor connector.
3. Remove the MAP sensor.
4. Install in the reverse order of removal.

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [L5]

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Verify that the voltage (M-MDS PID: MAP) within the specification. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) .) If not as specified, replace the MAP sensor. (See «MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S05476796052010102800000) .)

BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION [L5]

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Verify that the voltage (M-MDS PID: BARO) within the specification. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) ) NOTE: Because the PCM is integrated in the BARO sensor, replacing the BARO sensor includes replacement of the PCM. If not as specified, replace the PCM. (See «PCM REMOVAL/INSTALLATION [L5]»(ref-375347-S19052500852010102800000) .)

THROTTLE POSITION (TP) SENSOR INSPECTION [L5]

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Verify that the TP sensor output voltage (M-MDS PID: TP1, TP2) is within the specification. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) .) If not as specified, replace the throttle body. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)

ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L5]

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Verify that the APP sensor output voltage (PID: APP1, APP2) increases according to the increase in the accelerator opening angle when the accelerator opening angle is gradually increased. If verified, go to the next step. If not as verified, replace the accelerator pedal. (See «ACCELERATOR PEDAL REMOVAL/INSTALLATION [L5]»(ref-375352-S42722424332010102800000) .)
4. Verify that the APP sensor output voltage (PID: APP1, APP2) is within the specification when the accelerator pedal is depressed and not depressed. If not as specified, replace the accelerator pedal. (See «ACCELERATOR PEDAL REMOVAL/INSTALLATION [L5]»(ref-375352-S42722424332010102800000) .)

1. Disconnect the negative battery cable.
2. Remove the under cover.
3. Remove the splash shield (RH).
4. Disconnect the CKP sensor connector.
5. Remove the CKP sensor. (See «CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S00445311502010102800000) .)
6. Verify that there are no metal shavings on the sensor. Remove any metal shavings that are adhering.

Scheme 106

1. Verify that the CKP sensor is securely installed.
2. Using a thickness gauge, measure the air gap between the plate projections at the back of crankshaft pulley and the CKP sensor. If not within the specification, inspect the plate projections for cracks or bending. If there is any malfunction, replace the crankshaft pulley. (See «FRONT OIL SEAL REPLACEMENT [L5]»(ref-375350-S07329822372010102800000) .) CKP sensor air gap 0.5-1.5 mm {0.02-0.05 in}

1. Idle the engine.
2. Measure the CKP sensor output wave pattern using an oscilloscope. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) ) If not within the specification, replace the CKP sensor. (See «CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S00445311502010102800000) .)

1. Disconnect the negative battery cable.
2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [L5]»(ref-375350-S23041993352010102800000) .)
3. Disconnect the CMP sensor connector.
4. Remove the CMP sensor. (See «CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S18829582512010102800000) .)
5. Verify that there are no metal shavings on the CMP sensor. Remove any metal shavings that are adhering.

1. Idle the engine.
2. Measure the CMP sensor output wave pattern using an oscilloscope. (See «PCM INSPECTION [L5]»(ref-375347-S07672034272010102800000) ) If not within the specification, replace the CMP sensor. (See «CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L5]»(ref-375347-S18829582512010102800000) .)

Scheme 107

1. Disconnect the negative battery cable.
2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [L5]»(ref-375350-S23041993352010102800000) .)
3. Remove the intake manifold. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5]»(ref-375352-S14647925242010102800000) .)
4. Disconnect the KS connector.
5. Remove the KS.
6. Install in the reverse order of removal.

Scheme 108

1. Disconnect the negative battery cable.
2. Disconnect the KS connector.
3. Measure the resistance between the KS terminals A and B using an ohmmeter. If not as specified, replace the KS. (See «KNOCK SENSOR (KS) INSPECTION [L5]»(ref-375347-S04086093472010102800000) .) Specification Approx. 4.63-5.11 megohms [ECT: 25°C {77°F}]

1. Remove the evaporative hose component. (See «FUEL TANK REMOVAL/INSTALLATION [L5]»(ref-375354-S19244581302010102800000) .)
2. Turn the ignition switch to the ON position.
3. Plug one end of the evaporative hose component and verify that the output voltage from the fuel tank pressure sensor changes when pressure is applied from the other hose end. If not as verified, replace the evaporative hose component. (See «FUEL TANK REMOVAL/INSTALLATION [L5]»(ref-375354-S19244581302010102800000) .)