Intermittant Check Engine Light

NOTE: The CHECK ENGINE light will come on if the engine speed drops below 200 rpm. It will remain on until the speed is over 200 rpm for 4 seconds.

- Low battery voltage (under 9V) at ECM.
- Loss of trouble code memory. Momentarily grounding the dwell lead with engine at idle should store code 23. After engine is stopped and ignition turned "ON," check for voltage at ECM terminal "C46-1" and for code 23. If voltage is present but no code is stored, ECM is defective.
- Poor electrical connection at:
^ Ignition coil to ECM terminal "C46-10".
^ Battery to ECM terminal "C46-1".
^ ECM terminal "C46-13" to engine ground.
^ ECM terminal "C46-4" to lamp driver.
^ ECM terminal "C46-3" to Battery (including ECM relay circuit).