Code 12, 13 - Rpm Signal

Code 12 is caused by loss of "G" or "NE" signal from distributor to ECU for at least 2 seconds after starter signal is received at ECU. Check distributor and ignition system components. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Ensure starter signal exists at ECU. See TEST NO. 9 or CODE 43.

Code 13 is caused by loss of "NE" signal from distributor to ECU when engine RPM exceeds 1000 RPM. Check distributor and ignition system components. See See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.