This usually means a problm with the distributor. Sorry I am not sure of the costing and it is best to get local quotes to be accurate.
CODE 12 - G & NE SIGNAL CIRCUIT (NO. 1) (EXCEPT CALIF.)
The distributor or Integrated Ignition Assembly (IIA) contains 2 pick-up coils, G and NE signal coils. The G signal pick-up coil sends the ECM standard crankshaft angle. The NE signal pick-up coil sends the ECM crankshaft angle and engine speed. Code is set when there is no NE signal to ECM within 2 seconds after cranking and/or no G signal to ECM for 3 seconds or more with engine speed of 600-4000 RPM. Possible causes are:
G or NE open or short circuit.
Distributor pick-up coil(s).
STA open or short circuit.
Diagnosis & Repair
1. Ensure ignition is off. Disconnect distributor 4-pin connector. Using ohmmeter, measure resistance between specified terminals. See Fig. 3. See G & NE PICK-UP COIL RESISTANCE table. If any resistance measurement is not within specification, replace distributor. If all measurements are within specification, go to next step.
2. Inspect circuits between distributor and ECM for open or shorts. Repair as needed. If all circuits are okay, inspect air gap between each pick-up and signal rotor. If either air gap is NOT within specification, replace distributor. If both air gaps are within specification, replace ECM and retest.
Images (Click to enlarge)
Sunday, May 22nd, 2011 AT 7:52 PM