PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)]

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Note

•  The PCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the PCM is necessary to determine where the malfunction occurs.

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PCM terminal voltage table (Reference)

Inspection Using An Oscilloscope (Reference)

Fuel inject control signal (high)

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PCM terminals

•  No. 1: 101 (+)—Body ground (–)

•  No. 2: 110 (+)—Body ground (–)

•  No. 3: 109 (+)—Body ground (–)

•  No. 4: 102 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Variable boost control signal

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PCM terminals

•  104 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Generator command

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PCM terminals

•  107 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Fuel inject control signal (low)

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PCM terminals

•  No. 1: 118 (+)—Body ground (–)

•  No. 2: 126 (+)—Body ground (–)

•  No. 3: 125 (+)—Body ground (–)

•  No. 4: 117 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Fuel metering valve control signal

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PCM terminals

•  212 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

EGR valve servo motor control signal

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PCM terminals

•  227 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

CKP sensor signal

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PCM terminals

•  238 (+)—Body ground (–)

Oscilloscope setting

•  1 V/DIV (Y), 400 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

CMP sensor signal

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PCM terminals

•  240 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

APP sensor signal

Accelerator pedal is released

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Accelerator pedal is depressed

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PCM terminals

•  310 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Switch the ignition to ON (engine off).

Using the M-MDS (reference)

―  CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)

―  Main relay (See RELAY INSPECTION.)

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.

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

―  ACCS, ALTF, CABVDC, EGR_TV, EGRDC, FAN_DUTY, FP, GPC, RPM, ST_EN_RLY, VBCV

PID monitor table