Engine Control Module: Testing and Inspection
POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION1. Remove in the order shown in the figure.
2. Install in the reverse order of removal.
1. Negative battery cable
2. Cover
3. Center console
4. Powertrain Control Module (PCM) connector
5. PCM
INSPECTION
CAUTION: The Powertrain Control Module (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 center console.
3. Disconnect the PCM connector.
SSTs:
4. Connect the Special Service Tools (SST)s (Adapter harness) to the PCM 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 PCM terminals IA through 1AJ and 2A through 2T, and 3A through 3R. Use connector B for PCM terminals 3S through 3AB and 4A through 4AN.
6. Place the SST (Sheet) on the SST (Monitor, Engine Signal).
SST:
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 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 (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 PCM terminal voltages are made possible.
USING SST (NGS)
1. Connect the Special Service Tools (SST)s New Generation Star (NGS) tester to the data link connector-2 as shown in the figure.
2. Referring to the NGS operational manual, select the PID DATA MONITOR AND RECORD or PID DATA MONITOR function.
3. Referring to the Service Highlights, inspect each PCM input/output signal.
NOTE:
- The PID DATA MONITOR AND RECORD function is to monitor the calculation value of input/output signals in the PCM. Deviation in the value does not always indicate malfunction in the related input/output devices (sensors and solenoids).
- When normal output signal cannot be detected while all input signals are normal, replace the PCM.
PCM TERMINAL VOLTAGE (REFERENCE) Part 1 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 2 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 3 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 4 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 5 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 6 of 7:
PCM TERMINAL VOLTAGE (REFERENCE) Part 7 of 7:
TERMINAL VOLTAGE (REFERENCE)