Engine Control Module: Testing and Inspection

Fig. 15a Output signal diagnosis chart (Part 1 of 2). 1986 Conquest less intercooler:

Fig. 15b Output signal diagnosis chart (Part 2 of 2). 1986 Conquest less intercooler:

Fig. 16a Output signal diagnosis chart (Part 1 of 2). 1986 Conquest w/intercooler:

Fig. 16b Output signal diagnosis chart (Part 2 of 2). 1986 Conquest w/intercooler:

Fig. 18 ECU terminal identification. Conquest w/intercooler:

Fig. 17 ECU terminal identification. Exc. Conquest w/intercooler:

Using output signal diagnosis chart, Figs. 15 and 16, connect voltmeter to diagnostic connector, Fig. 17 or Fig. 18, as specified in ``Terminal Location of Computer'' column in diagnostic chart. Check voltage at each terminal, ensuring tests are made under conditions specified.
When checking the ISC motor position switch, if ignition switch is turned on for 15 seconds or more, the reading will drop momentarily below 5 volts. When checking pressure sensor with engine idling, the reading will increase momentarily to 1.5-2.6 volts every 2 minutes.