DTC 12

Fig. 001 - Chart - Code 12 No Distributor Reference Pulses.:

Fig. 13 Chart #12 Diagnosis:

Code 12 means the ECM is "ON" and sees no reference pulse from the distributor.
- This is a normal code with the ignition "ON" and engine not running.
- Code 12 is not stored and will only flash when the fault is present.
- Code 12 with the engine running could mean an open or ground in the distributor reference circuit.
Code 41 will appear with Code 12 if the engine is running with no distributor reference signal.
- If the problem clears, Code 41 will store.