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Home >> Mazda >> 1997 >> MX-5 Miata L4-1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> Using SST's (Engine Signal Monitor)

Using SST's (Engine Signal Monitor)

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. Disconnect the negative battery cable.
2. Remove the PCM.
3. Disconnect the PCM connector.




4. Connect the Special Service Tools (Harness Adapter) to the PCM connector.
5. Connect the Special Service Tools (Engine Signal Monitor and Harness adapter, power) to the Special Service Tools (Harness Adapter). Use connector A of the harness adapter for PCM terminals 1 A through lv and 3A through 3R Use connector B for PCM terminals 4A through 4Z.
6. Place the Special Service Tools (Sheet) on the Engine Signal Monitor.
7. Measure the voltage at each PCM terminal by switching the selector switch and the monitor switch.













8. If any incorrect voltage is detected, check related systems, wiring harnesses and connectors referring to the possible malfunction in the terminal voltage list.

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




- Applying voltage to terminals A and B of the Special Service Tools (Engine Signal Monitor) can damage the Monitor.

NOTE:
- The indicator lights of the Engine Signal Monitor, 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 Special Engine Signal Monitor 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 PCM terminal voltages are made possible.
- If the tires are rotated by using a chassis roller with the ignition switch at ON, the ABS control module may memorize the action as a malfunction and the ABS warning light may illuminate. If the ignition switch is turned to LOCK and then to ON again, the ABS warning light will not illuminate, because the action will be considered a past malfunction.
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