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Without Using the M-MDS

Note

• The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

PCM inspection preparation

1.Disconnect the negative battery cable.

2.Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L3 Turbo].)

3.Remove the windshield wiper arm and blade. (SeeWINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION.)

4.Remove the cowl grille. (SeeCOWL GRILLE REMOVAL/INSTALLATION.)

5.Remove the windshield wiper motor. (SeeWINDSHIELD WASHER MOTOR REMOVAL/INSTALLATION.)

6.Remove the cowl panel. (SeeCOWL PANEL REMOVAL/INSTALLATION.)

7.Remove the PCM bracket with the PCM connector still connected. (SeePCM REMOVAL/INSTALLATION [L3 Turbo].)

8.Install the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L3 Turbo].)

9.Connect the negative battery cable.

PCM terminal voltage table (Reference)

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Inspection Using An Oscilloscope (Reference)

Fan control module signal

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PCM terminals

• 1R (+)—body ground (–)

• 1AE (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

Generator field coil control signal

ampjjw00001528

PCM terminals

• 1AW (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Idle after warm up (engine speed approx. 650 rpm, no load)

Generator output voltage signal

ampjjw00001529

PCM terminals

• 1AX (+)—body ground (–)

Oscilloscope setting

• 2 V/DIV (Y),1 ms/DIV (X), DC range

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

A/F sensor heater control signal

acxuuw00000275

PCM terminals

• 2C (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

CMP sensor signal

acxuuw00000127

PCM terminals

• 2S (+)—body ground (–)

Oscilloscope setting

• 2 V/DIV (Y), 100 ms/DIV (X), DC range

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

CKP sensor signal

acxuuw00000128

PCM terminals

• 2W (+)—body ground (–)

Oscilloscope setting

• 2 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

Wastegate control solenoid valve signal

acxuuw00002325

PCM terminals

• 2AA (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Ignition switch to the ON position

Purge control signal

ampjjw00001527

PCM terminals

• 2AB (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Engine speed is 2,000 rpm

OCV signal

acxuuw00000129

PCM terminals

• 2AF (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

IGT1, IGT2, IGT3, IGT4 control signals

ampjjw00000781

PCM terminals

• IGT1 (No.1): 2BA (+)—body ground (–)

• IGT2 (No.2): 2AW (+)—body ground (–)

• IGT3 (No.3): 2AX (+)—body ground (–)

• IGT4 (No.4): 2AT (+)—body ground (–)

Oscilloscope setting

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

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

Fuel injection control (–)

acxuuw00002326

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), 20 ms/DIV (X), DC range

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

Fuel injection control (+)

acxuuw00000277

PCM terminals

• Fuel injection No.1, No.4: 2BG (+)—body ground (–)

• Fuel injection No.2, No.3: 2BH (+)—body ground (–)

Oscilloscope setting

• 20 V/DIV (Y), 400 µs/DIV (X), DC range

Vehicle condition

• Idle after warm up (no load, P/S off, A/C off)

Using the M-MDS

Note

• PIDs for the following parts are not available on this model. Perform the specific inspections for the following parts:

― CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3 Turbo].)

― Main relay

1.Connect the M-MDS to the DLC-2.

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2.Turn the ignition switch to the ON position.

3.Measure the PID value.

• If PID value is not within the specification, follow the instructions in the “Inspection item“ column.

Note

• The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.

• For input/output signals except those of the monitoring items, use a voltmeter to measure the PCM terminal voltage.

• The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.

― ACCS, ALTF, ARPMDES, EVAPCP, FAN_DUTY, FP, IMRC, INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, TEST, VT DUTY1 Wt, WGC

PID/DATA monitor table (reference)