PCM INSPECTION [MZ-CD 1.6]

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Specification identification

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Without Using the SST

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)

MAF sensor signal

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PCM terminals

•  109 (+)—Body ground (–)

Oscilloscope setting

•  2 V/DIV (Y), 200 us/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Fuel injector (high) signal

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PCM terminals

•  No.1: 112 (+)—Body ground (–)

•  No.2: 123 (+)—Body ground (–)

•  No.3: 124 (+)—Body ground (–)

•  No.4: 111 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

CMP sensor signal

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PCM terminals

•  128 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Intake shutter valve actuator (-) signal

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PCM terminals

•  134 (+)—Body ground (–)

Oscilloscope setting

•  5 V/DIV (Y), 400 us/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Fuel injector (low) signal

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PCM terminals

•  No.1: 136 (+)—Body ground (–)

•  No.2: 147 (+)—Body ground (–)

•  No.3: 148 (+)—Body ground (–)

•  No.4: 135 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

EGR valve actuator (-) signal

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PCM terminals

•  144 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

EGR valve actuator (+) signal

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PCM terminals

•  145 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Intake shutter valve actuator (+) signal

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PCM terminals

•  146 (+)—Body ground (–)

Oscilloscope setting

•  5 V/DIV (Y), 400 us/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Fuel metering valve control signal

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PCM terminals

•  202 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Wastegate valve actuator control solenoid valve signal

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PCM terminals

•  204 (+)—Body ground (–)

Oscilloscope setting

•  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

•  Type A: 227 (+)—Body ground (–)

•  Type B: 108 (+)—Body ground (–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm-up

Using M-MDS

Caution

•  The PCM terminal voltage vary with change in measuring conditions and vehicle conditions.

Always carry out a total inspection of the input systems, output systems, and PCM to determine the cause of trouble. Otherwise, diagnosis will be incorrect.

1.  Connect the M-MDS to the DLC-2. (See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.6].)

2.  Measure the PID value.

•  If PID value is not within the specification, follow the instructions in ACTION column.

3.  Switch the ignition to ON.

PID Monitor Table