2.0/2.3L MCU Testing: Diagnosis
The MCU system is capable of diagnosing some problems which may occur. To determine which components should be checked, perform the "Functional Test" which follows. If problems do exist, a service code will be displayed (as pulses on a voltmeter).
Locate the appropriate test chart and follow the repair procedure as instructed. DO NOT use the test charts unless referred to them by the "Functional Test", or you may replace some components unnecessarily. Testing procedures require the following equipment:
- Dial Voltmeter (0-20v scale).
- Digital Voltmeter (DVOM - Min. impedance 10 megohms).
- Vacuum Gauge (0-30 in. Hg).
- Vacuum pump.
- Tachometer.
- Jumper Wire.
NOTE:
A small, portable tester for 1981 and later models is available from Hickok Electrical Instrument Co., 10514 Dupont Ave., Cleveland, OH 44106. This tester (STAR: Self Test Automatic Readout) provides built-in capability to locate intermittents within the MCU system.