Component Tests and General Diagnostics

PCM INSPECTION [MZR 2.5]

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.

Terminal voltage table (Reference)

































*1
With cruise control system
*2
MTX

Inspection Using An Oscilloscope (Reference)

Purge control





PCM terminals
- 1BA(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

A/F sensor heater control





PCM terminals
- 2A(+)-body ground(-)

Oscilloscope setting
- 5 V/DIV (Y), 200 ms/DIV (X), DC range

Vehicle condition
- Idle (after warm up)

HO2S heater control





PCM terminals
- 2B(+)-body ground(-)

Oscilloscope setting
- 5 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition
- Idle (after warm up)

OCV control signal





PCM terminals
- 2E(+)-body ground(-)

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

Vehicle condition
- Racing

IGT1, IGT2, IGT3, IGT4 control





PCM terminals
- IGT1(ignition coil No.1): 2G(+)-body ground(-)
- IGT2(ignition coil No.2): 2K(+)-body ground(-)
- IGT3(ignition coil No.3): 2L(+)-body ground(-)
- IGT4(ignition coil No.4): 2H(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

CMP signal





PCM terminals
- 2S(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

CKP signal





PCM terminals
- 2W(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

Generator field coil control





PCM terminals
- 2AA(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

Generator output voltage





PCM terminals
- 2AF(+)-body ground(-)

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

Vehicle condition
- idle (after warm up)

Fuel injection (#1, #2, #3, #4) control





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)

Using M-MDS

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

- CMP sensor
- Main relay

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

2. Switch the ignition to ON.

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.
- When detecting DTCs, PIDs related to a malfunctioning system may not display even if the module is normal. Therefore, if a PID is not displayed, it is necessary to verify the DTC, perform malfunction diagnosis of the DTC that was detected, and do repairs.
- 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, EVAPCV, FAN1, FAN3, FP, IMRC, IMTV, INJ_1~4, SEGRP, Test, VT Duty1 wt

PID/DATA monitor table (reference)





































*1
MTX
*2
With cruise control system

- Following PIDs are for the ATX models. If inspects for following PIDs, PID/Data Monitor Inspection