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Home >> Mazda >> 1996 >> MPV 4WD V6-3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> ECM Pin Test

ECM Pin Test

CAUTION:
- The ECM terminal voltages vary with change in measuring conditions and vehicle conditions.
- Always carry out a total inspection of the input systems, output systems, and ECM to determine the cause of trouble; otherwise, a wrong diagnosis can be made.





Removal / Installation:
1. Remove the scuff plate (right side) and front side trim (right side).
2. Lift up the front mat.
3. Remove the protector cover.
4. Disconnect the engine control module connector.
5. Remove the engine control module.
6. Install in the reverse order of removal.

Inspection:
1. Disconnect the negative battery cable.
2. Remove the ECM.




3. Connect the SST (Adapter harness) to the ECM.
4. Connect the SSTs (Monitor, Engine Signal and Harness adapter, power) to the SST (Adapter harness). Use connector A of the adapter harness for ECM terminals 1A through 1V and 3A through 3P. Use connector B for ECM terminals 2A through 2L and 4A through 4Z.




5. Place the SST (Sheet) on the SST (Monitor, Engine Signal).
6. Measure the voltage at each ECM terminal by switching the selector switch and the monitor switch.
7. If any incorrect voltage is detected, check related systems, wiring harnesses and connectors referring to the possible malfunction in the ECM terminal voltage charts.
8. If normal output signal cannot be detected when all input signals are normal, replace the ECM.

Additional Testing Notes and Cautions:

CAUTION:
- Disconnecting the connectors of the ECM and the SST (Adapter harness) while the battery is connected can damage the ECM and the SST (Monitor, Engine Signal).
- Disconnect the negative battery cable and the SST (Harness adapter, power) before disconnecting the connectors.




- Applying voltage to terminals A and B of the SST (Monitor, Engine Signal) can damage the SST (Monitor, Engine Signal).

NOTE:
- The indicator lights of the SST (Monitor, Engine Signal), provided for confirmation of the voltmeter range, is also used for detection of the pulse such as the fuel injector control signal, which is difficult to detect by using the voltmeter.
- Terminals A and B of the SST (Monitor, Engine Signal) are for connection of an external instrument.
- By connecting an external instrument such as a circuit tester or an oscilloscope, various inspections in addition to the measurement of the ECM terminal voltages are made possible.
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