Component Tests and General Diagnostics

WARNING:
Apply parking brake without fail before this work. With manual transmission vehicle, shift gear shift lever to NEUTRAL position and with automatic transmission vehicle, shift selector lever to "P" range.

1. Start engine and warm it up normal operating temperature.





NOTE:
With vehicles of Federal specifications except Californian Emission Specification and Canadian specification ones, be sure to turn off malfunction indicator lamp ("CHECK ENGINE" light) with its cancel switch and perform following inspection.

2. Stop engine.
3. Remove cap from monitor coupler beside battery.





4. Using service wire, short terminals "B" and "D" of the monitor coupler.





5. Run engine at idle speed and check malfunction indicator lamp ("CHECK ENGINE" light) on meter panel as to which number of diagnostic trouble code it indicates.
6. If malfunction indicator lamp ("CHECK ENGINE" light) indicates No. 12 of diagnostic trouble code, ECM and associated sensors are in good condition, but if it indicates any other diagnostic trouble code , refer to Computers and Control Systems/Procedures.
7. Stop engine, remove service wire and reinstall monitor coupler cap securely.