Engine Control System: Diagnosis Mazda MPV II рестайлинг

PCM INSPECTION

Scheme 343

1. Disconnect the negative battery cable.
2. Disconnect the PCM connector.
3. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
4. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
5. Connect the negative battery cable.
6. Measure the voltage at each terminal. If any incorrect voltage is detected, inspect the related systems, wiring harnesses and connectors referring to the Action column in the terminal voltage table.

Scheme 344

Scheme 345

Scheme 346

Scheme 347

Scheme 348

Scheme 349

Scheme 350

1. Not equipped with immobilizer system
2. Equipped with immobilizer system
3. Equipped with A/C system
4. Not equipped with A/C system

Scheme 351

1. PCM terminal: 58(+)-24(-)
2. Oscilloscope setting: 1V/DIV (Y), 25ms/DIV(X), DC range
3. Vehicle condition: Driving speed 60 km/h [37 mph]

Scheme 352

1. PCM terminal: 48(+)-103(-)
2. Oscilloscope setting: 2V/DIV (Y), 5ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 353

1. PCM terminal: 60, 87(+)-91(-)
2. Oscilloscope setting: 0.2V/DIV (Y), 200ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 354

1. PCM terminal: 85(+)-86(-)
2. Oscilloscope setting: 0.5V/DIV (Y), 10ms/DIV (X), AC range
3. Vehicle condition: idle after warm up

Scheme 355

1. PCM terminal: 83(+)-24(-)
2. Oscilloscope setting: 2V/DIV (Y), 0.1 ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 356

1. PCM terminal No. 1: 75(+)-103(-) No. 2: 101(+)-103(-) No. 3: 74(+)-103(-) No. 4: 100(+)-103(-) No. 5: 73(+)-103(-) No. 6: 99(+)-103(-)
2. Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 357

1. PCM terminal IGT1 26(+)-103(-) IGT2 1(+)-103(-) IGT3 52(+)-103(-) IGT4 27(+)-103(-) IGT5 78(+)-103(-) IGT6 82(+)-103(-)
2. Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 358

1. PCM terminal: 21(+)-22(-)
2. Oscilloscope setting: 4V/DIV (Y), 2.5 ms/DIV (X), AC range
3. Vehicle condition: idle after warm up

Scheme 359

1. PCM terminal: 18(+)-103(-)
2. Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 360

1. PCM terminal: 30(+)-103(-)
2. Oscilloscope setting: 2V/DIV (Y), 1ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 361

1. PCM terminal: 53(+)-103(-)
2. Oscilloscope setting: 0.5V/DIV (Y), 1ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 362

1. PCM terminal: 19(+)-103(-)
2. Oscilloscope setting: 1V/DIV (Y), 2ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 363

1. PCM terminal: 20(+)-103(-)
2. Oscilloscope setting: 1V/DIV (Y), 10ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 364

1. PCM terminal: 44(+)-103(-)
2. Oscilloscope setting: 1V/DIV (Y), 10ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

Scheme 365

1. PCM terminal: 442(+)-103(-)
2. Oscilloscope setting: 1V/DIV (Y), 40ms/DIV (X), DC range
3. Vehicle condition: idle after warm up

PCM Inspection Using the SST (WDS or equivalent)

Note. PIDs for the following parts are not available on this model. Go to the appropriate part inspection page. CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .) Main relay (See RELAY INSPECTION .)

1. Connect the WDS or equivalent to the DLC-2. (See ON-BOARD DIAGNOSTIC TEST .)
2. Turn the ignition switch to ON.
3. Measure the value. If the value is not within the specification, follow the instructions in Action column.

Scheme 366

Scheme 367

Scheme 368

Scheme 369

Scheme 370

1. Retrieve the following FFD, excluding FDMTIME, FDMIAT, FDMECTS and FDMTP. Retrieve the FFD for FDMTIME, FDMIAT, FDMECTS and FDMTP from PID/DATA MONITOR & RECORD. NOTE: FFD is a snapshot of the conditions that are present when DTC or PENDING CODE is stored. Once FED is stored, this data will remain in PCM memory even if another emission related DTC or PENDING CODE is stored additionally, except for Misfire or Fuel System related DTC or PENDING CODE. Once Misfire or fuel System related DTC or PENDING CODE is stored, it will overwrite any previous data and the FFD will not be further overwritten. When DTC associated with the FFD is erased or PCM< is reset, new FFD can be stored.

Scheme 371

1. Retrieve the following FFD from PID/DATA MONITOR & RECORD. NOTE: The data will remain in the memory even if another emission-related DTC is stored, including the Misfire and Fuel System Monitor DTCs.

MASS AIRFLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION

Note. Perform the following test only when directed.

Scheme 372

1. Turn the ignition switch to LOCK.
2. Disconnect the PCM connector.
3. Connect the SST (104 Pin Breakout Box) to the PCM connector and the PCM as shown.
4. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
5. Turn the ignition switch to ON.
6. Measure the voltage between the breakout box pins 36 and 88. If not as specified, perform the "MAF Sensor Circuit Open/Short Inspection." Specification 0.0-0.1 V
7. Turn the ignition switch to START and warm up the engine completely.
8. Measure the voltage between the breakout box pins 36 and 88. If not as specified, perform «MAF Sensor Circuit Open/Short Inspection»(ref-178044-S09781443662005061000000) . Specification 0.5-0.8 V

Scheme 373

Scheme 374

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) )
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

THROTTLE POSITION (TP) SENSOR INSPECTION

Note. Perform the following test only when directed.

Scheme 375

1. Verify that the throttle valve is at CTP.
2. Inspect accelerator cable free play. (See ACCELERATOR CABLE INSPECTION .)
3. Measure the resistance between TP sensor terminals A and C using an ohmmeter. If not as specified, replace the TP sensor. If as specified, but PID value or PCM terminal 89 voltage are out of specification, perform «Circuit Open/Short Inspection»(ref-178044-S38653364012005061000000) . Specification 3.2-4.8 kilohms

Scheme 376

Scheme 377

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Check the following wiring harness for open or short circuit (Continuity check).

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION

Note. Perform the following test only when directed.

Scheme 378

Scheme 379

Scheme 380

1. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS .) (See ENGINE COOLANT REPLACEMENT .)
2. Remove the ECT sensor.
3. Place the ECT sensor in water with a thermometer, and heat the water gradually.
4. Measure the resistance between the ECT sensor terminals using an ohmmeter. If not as specified, replace the ECT sensor. If the ECT sensor is okay, but PID value or PCM terminal 38 voltage are out of specification, perform «Circuit Open/Short Inspection»(ref-178044-S28170133552005061000000) . Specification

Scheme 381

Scheme 382

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

Resistance Inspection

1. Disconnect the CKP sensor connector.
2. Measure the resistance between CKP sensor terminals A and B using an ohmmeter. If not as specified, replace the CKP sensor. If CKP sensor resistance is okay, but PID value or PCM terminals 21 and 22 voltages are out of specification, perform the "Circuit Open/Short Inspection". Specification 267-325 ohms

Scheme 383

Scheme 384

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

1. Disconnect the CMP sensor connector.
2. Measure the resistance between CMP sensor terminals A and B using an ohmmeter. Specification 308-376 ohms If not as specified, replace the CMP sensor. If CMP sensor resistance is okay, but PID value or PCM terminals 85 and 86 voltages are out of specification, perform «Circuit Open/Short Inspection»(ref-178044-S04699518762005061000000) .

Scheme 385

Scheme 386

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

KNOCK SENSOR INSPECTION

Note. Perform the following test only when directed.

1. Turn the ignition switch to LOCK.
2. Disconnect the knock sensor connector.
3. Measure the resistance between the knock sensor terminals A and B. If not as specified, replace the knock sensor. If the knock sensor is okay, but PID value or PCM terminal 57 and 66 voltage are out of specification, perform the "Circuit Open/Short Inspection." Specification Approx. 560 kilohms (20 °C {68 °F})

Scheme 387

Scheme 388

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

HO2S Voltage Inspection

Note. Perform the following test only when directed.

Scheme 389

1. Warm up the engine and run it at idle.
2. Disconnect the HO2S (front or rear) connector.
3. Connect the voltmeter test leads to the following HO2S terminals: HO2S (Front, RH) and HO2S (Rear, RH) (+) lead-terminal A (-) lead-terminal B HO2S (Front, LH) and HO2S (Rear, LH) (+) lead-terminal A (-) lead-terminal B
4. Run the engine at 3,000 rpm until the voltmeter moves between approx. 0 and 1.0 V.
5. Verify that the measurement voltage changes when the engine speed increases and decreases suddenly several times. If not as specified replace the HO2S. If the HO2S is okay, but PID value or PCM terminal voltages are out of specification, perform «HO2S Circuit Open/Short Inspection»(ref-178044-S09420661192005061000000) . Specification

Scheme 390

Scheme 391

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

HO2S Heater Resistance Inspection

1. Disconnect the HO2S (front or rear) connector.
2. Measure the resistance between the following HO2S terminals. HO2S (Front, RH) and HO2S (Rear, RH) Terminal C and D HO2S (Front, LH) and HO2S (Rear, LH) Terminal C and D If not as specified, replace the HO2S. If the HO2S heater is okay, but PID value or any of PCM terminal 94, 93, 95, 96 voltage are out of specification, perform «Circuit Open/Short Inspection»(ref-178044-S32557263962005061000000) . Specification Front (RH, LH): 5.0-6.8 ohms Rear (RH, LH): 14.1-18.9 ohms

Scheme 392

Scheme 393

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short circuit (Continuity check).

EGR BOOST SENSOR INSPECTION

Note. Perform the following test only when directed.

Voltage Inspection

Using the SST (104 pin breakout box)

Scheme 394

1. Turn the ignition switch to LOCK.
2. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
3. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
4. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
5. Turn the ignition switch to ON.
6. Disconnect the vacuum hose between the EGR boost sensor and the EGR boost sensor solenoid valve.
7. Verify that the PCM 34 terminal voltage is within the specification. NOTE: The output voltage varies with the following condition. Input voltage 4.5-5.5 V Outside temperature 10-50 °C {50-122 °F} Sea level -200-3,000 m {-656-9,840 ft} Specification Measurement voltage: 2.3-4.7 V CAUTION: Do not apply vacuum out of specification. Doing so will damage the EGR boost sensor.
8. Apply vacuum of -26.6 kPa {-200 mmHg, -7.85 inHg} to the EGR boost sensor and verify that PCM 34 terminal voltage varies from Step 7 as specified. If not as specified, perform «Circuit Open/Short Inspection»(ref-178044-S25737894222005061000000) . Specification Voltage variation: 0.8-1.3 V

Scheme 395

Scheme 396

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following wiring harness for open or short (Continuity check).

POWER STEERING PRESSURE (PSP) SWITCH INSPECTION

Note. Perform the following test only when directed.

Scheme 397

1. Inspect the following if the power steering is inoperative (See POWER STEERING FLUID INSPECTION .): 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 GND using an ohmmeter. If not as specified, replace the PSP switch. If the PSP switch is okay, but PID value or PCM terminal 31 voltage are out of specification, perform «Circuit Open/Short Inspection»(ref-178044-S02237581772005061000000) . Specification

Scheme 398

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION»(ref-178044-S29084955492005061000000) .)
2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt. Tightening torque 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
4. Inspect the following harness for open or short circuit (Continuity check).