Component Tests and General Diagnostics

An electronic Fuel Feedback Tester (part No. ET-501) is available to help in diagnosing system problems. If this tester is not available, use diagnostic tests 1 through 12 in DIAGNOSTIC CHARTS under TESTING PROCEDURES. To perform a complete system diagnosis, diagnostic test 1 should be performed first, then succeed numerically until all 12 tests have been performed. The steps in each test provide a systematic evaluation of each component, and describe possible causes for an operational malfunction. After a repair has been completed, repeat the appropriate test to determine that the malfunction has been eliminated. The equipment required to perform the diagnostic tests is listed below:

- tachometer
- hand-held vacuum pump
- digital volt-ohmmeter (minimum input impedance of 10 meg-ohms)

WARNING: When performing system diagnostic tests, the following safety precautions must be followed:
- Cut a piece of plexi-glass in the same shape as the air cleaner cover (at least .250 in. thick). After removing the air cleaner cover, place the plexi-glass on the air cleaner assembly, and tighten down the air cleaner wing nut.
- Always wear eye protection while performing the diagnostic tests.
- When the engine is running, keep hands and arms clear of drive belts, pulleys, and the cooling fan. Do not wear loose clothing, and do not stand in direct line with the cooling fan.