Codes P1350/P1361, Ic Circuit: Notes

When engine is cranking, Ignition Control (IC) module sends a spark reference and a fuel control signal to control module. At start of crank, IC module controls ignition timing (module mode). Engine control module sends a 5 volts signal on by-pass circuit to switch timing to control module control when second fuel control pulse is recognized by engine control module. Code P1350 will set at start-up if an open is present in ignition control circuit. Code P1361 will set if an open in Ignition Control (IC) circuit, or an open or grounded by-pass circuit is present during time when engine is started. Engine may be started but will run on module mode timing.

When Codes P1350/P1361 are set, engine control module will remove 5-volt by-pass signal causing engine to run on ignition module mode timing. Engine control module will illuminate Malfunction Indicator Light (MIL).

1. Checks if engine control module recognizes a problem. If Codes P1350/P1361 are not set, problem is intermittent and could be caused by a loose connection.
2. With engine control module disconnected, ohmmeter reading should be less than 200 ohms, which is normal resistance of IC circuit through ignition module. A higher resistance indicates a fault in IC circuit, a poor ignition module connection, or a faulty ignition module.
3. If test light lights when connected between 12 volts and engine control module by-pass circuit terminal, either by-pass circuit is shorted to ground, or ignition module is faulty.
4. Checks if ignition module switches when by-pass circuit is energized by 12 volts through test light. If ignition module switches, ohmmeter reading should shift to greater than 6000 ohms.
5. Disconnecting ignition module should make ohmmeter read as if an open circuit was being monitored (infinite reading). Otherwise, IC circuit is shorted to ground.