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Home >> Mazda >> 1996 >> MX-6 L4-1991cc 2.0L DOHC >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> With Manual Transaxle (MTX)

With Manual Transaxle (MTX)

ENGINE CONTROL MODULE REMOVAL / INSTALLATION
1. Disconnect the battery negative terminal.
2. Remove in the order shown in the figure.
3. Install in the reverse order of removal.




1. Center console
2. ECM connector
3. ECM

INSPECTION

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 will be made.

1. Disconnect the negative battery cable.
2. Remove the center console.
3. Disconnect the ECM connector.

Special Service Tool (SST):




4. Connect the SST (Adapter Harness) to the ECM connector.

SST:




5. 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 4A through 4Z.
6. Place the SST (Sheet) on the SST (Monitor, Engine Signal).

SST:




7. Measure the voltage at each ECM 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 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.

USING SST (NGS)




1. In the passenger compartment, connect the SST to the data link connector-2 as shown in the figure.




2. Referring to the NGS instruction manual, select the "PID / DATA MONITOR AND RECORD" function.
3. Inspect each ECM input"output signal.

NOTE:
- The "PID/DATA MONITOR AND RECORD" function is to monitor the calculation value of input / output signals in the ECM. Deviation in the value does not always indicate malfunction in the related input/output devices.
- For inspection of the input/output signals other than in the link monitor table, check voltage at the applicable ECM terminal by using the SST (Monitor, Engine Signal).

ECM Pinout Part 1 Of 4:




ECM Pinout Part 2 Of 4:




ECM Pinout Part 3 Of 4:




ECM Pinout Part 4 Of 4:




TERMINAL VOLTAGE (REFERENCE)

4. If normal output signal cannot be detected when all input signals are normal, replace the ECM.

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