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