Engine Control Module: Testing and 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.

USING SPECIAL SERVICE TOOL ENGINE SIGNAL MONITOR

Powertrain Control Module (PCM) Replacement:

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

SSTs Engine Signal Monitor:

4. Connect the Special Service Tool (SST) (Adapter harness) to the PCM connector.
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 1A through 1AJ and 2A through 2T, and 3A through 3R. Use connector B for PCM terminals 3S through 3AB and 4A through 4AN.

SSTs Engine Signal Monitor Details:

6. Place the SST (Sheet) on the SST (Monitor, Engine Signal).
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.

SSTs Engine Signal Monitor Details:

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.

PCM Terminal Voltage Reference (1 Of 7):

PCM Terminal Voltage Reference (2 Of 7):

PCM Terminal Voltage Reference (3 Of 7):

PCM Terminal Voltage Reference (4 Of 7):

PCM Terminal Voltage Reference (5 Of 7):

PCM Terminal Voltage Reference (6 Of 7):

PCM Terminal Voltage Reference (7 Of 7):

TERMINAL VOLTAGE (REFERENCE)

USING SST (NGS)

New Generation Star (NGS) Tester, Connected to DLC-2:

1. Connect the SSTs New Generation Star (NGS) tester to the data link connector 2 as shown in the figure.

NGS Display:

2. Referring to the NGS operational manual, select the PID DATA MONITOR AND RECORD or PID DATA MONITOR function.

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).

3. Press CLEAR to clear previously selected items. (A list of item descriptions appears on the screen.)
4. Select items necessary and press START.
5. Carry out inspection referring to PID/DATA MONITOR table.

PID/DATA Monitor Table (1 Of 4):

PID/DATA Monitor Table (2 Of 4):

PID/DATA Monitor Table (3 Of 4):

PID/DATA Monitor Table (4 Of 4):

PID/DATA MONITOR TABLE

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