Circuit Description

See CODE 12 - G & NE SIGNAL CIRCUIT  (NO. 1 - EXCEPT CALIF.). Code is set when there is no NE signal to ECM for .1 second or more at 1000 RPM or greater and/or NE signal does not pulse 12 times to ECM during the interval between G1 and G2 pulses. Possible causes for all conditions are:

• NE open or short circuit.
• Distributor pick-up coil(s).
• ECM.