All, Except California Spec Vehicles.

CODE 12 - G, NE SIGNAL CIRCUIT (NO. 1)

INSPECTION PROCEDURE
1. Check resistance of each pickup coils in distributor.
a. Disconnect distributor connector.




b. Measure resistance between each terminal shown in table.

Table Of Pickup Coil Resistance Values:

c. Compare measured values to the table of values.

- If OK proceed to step 2.
- If not OK replace distributor housing assembly.

2. Check for open and short in harness and connector between engine control module and distributor.

- If OK proceed to step 3.
- If not OK repair or replace harness or connector.

3. Check air gap.
a. Remove distributor cap and rotor.



b. Using a feeler gauge, measure the air gap between the signal rotor and pickup coil projection.

Air gap: 0.2 - 0.4 mm (0.008 - 0.016 in.)

- If OK check and replace engine control module.
- If not OK replace distributor housing assembly.

INSPECTION USING OSCILLOSCOPE



- During cranking or idling, check waveforms between terminals G and G-, NE+ and NE- of engine control module.