Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1997 >> MPV ES 2WD 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 >> Component Tests and General Diagnostics >> With SST-Engine Signal Monitor

With SST-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. If this is not done, a wrong diagnosis will be made.

Using SSTs (Engine Signal Monitor)
1. Disconnect the negative battery cable.
2. Remove the PCM.




3. Connect the SST (Adapter harness) to the PCM.
4. Connect the SSTs (Monitor, Engine Signal and Harness adapter, power) to the SST (Adapter harness). Use connector A of the adapter harness for PCM terminals 1 A through lv and 3A through 3P. Use connector B for PCM 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 PCM terminal by switching the selector switch and the monitor switch.

PCM Terminal Voltage Reference Chart Part 1 Of 4:




PCM Terminal Voltage Reference Chart Part 2 Of 4:




PCM Terminal Voltage Reference Chart Part 3 Of 4:




PCM Terminal Voltage Reference Chart Part 4 Of 4:




7. 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 SST (Adapter harness) while the battery is connected can damage the PCM 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. Do not apply voltage to either of these terminals.

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 PCM terminal voltages are made possible.


pro multis · About Operation CHARM