PCM Inspection

PCM INSPECTION [MZR 1.5]

Without Using the M-MDS

CAUTION:
- The PCM terminal voltages 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, a wrong diagnosis will be made.

1. Measure the voltage at each terminal.

- If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the Action column in the terminal voltage table.

PCM Terminal Voltage Table (Reference)





































*1
ATX
*2
MTX
*3
With cruise control system

Inspection Using An Oscilloscope (Reference)

Fuel injection control signal





PCM terminals
- Fuel injector No.1: 2A (+)-Negative battery terminal (-)
- Fuel injector No.2: 2B (+)-Negative battery terminal (-)
- Fuel injector No.3: 2C (+)-Negative battery terminal (-)
- Fuel injector No.4: 2H (+)-Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

CMP signal





PCM terminals
- 2N (+)-Negative battery terminal (-)

Oscilloscope setting
- 1 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

Evaporative purge control signal





PCM terminals
- 2S (+)-Negative battery terminal (-)

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

Vehicle condition
- idle (after warm up)

Variable valve timing control signal





PCM terminals
- 2W (+)-Negative battery terminal (-)

Oscilloscope setting
- 10 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

A/F sensor heater control signal





PCM terminals
- 2X (+)-Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

CKP signal





PCM terminals
- 2Y(+)-Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

Generator output voltage signal





PCM terminals
- 2AE (+)-Negative battery terminal (-)

Oscilloscope setting
- 2 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

Generator field coil control signal





PCM terminals
- 2AF (+)-Negative battery terminal (-)

Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

ESA control signal





PCM terminals (except for California emission regulation applicable model)
- Ignition coil No.1: 2AQ (+)-Negative battery terminal (-)
- Ignition coil No.2: 2AR (+)-Negative battery terminal (-)
- Ignition coil No.3: 2AU (+)-Negative battery terminal (-)
- Ignition coil No.4: 2AV (+)-Negative battery terminal (-)

Oscilloscope setting
- 0.5 V/DIV (Y), 40 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

Throttle control (-) signal





PCM terminals
- 2BE (+)-Negative battery terminal (-)

Oscilloscope setting
- 10 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- idle (after warm up)

Throttle control (+) signal





PCM terminals
- 2BF (+)-Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 0.4 ms/DIV (X), DC range

Vehicle condition
- Switch the ignition to ON.

Using The M-MDS

NOTE:
- PIDs for the following parts are not available on this model. Go to the appropriate part inspection.

- CMP sensor Testing and Inspection
- Main relay Testing and Inspection

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






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

- ACCS, ALTF, ARPMDES, EVAPCP, EVAPCV, FAN1, FAN2, FP, IMRC, INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, Test, VT Duty1 wt

































*1
With cruise control system
*2
MTX
*3
ATX