Grand AM L4-138 2.3L VIN A MFI (1992)
The Integrated Direct Ignition (IDI) module monitors the crank sensor signals and based on these signals sends a reference signal to the ECM so
that correct spark and fuel injector control can be maintained during all driving conditions.
OPERATION
During cranking, the IDI module monitors the "sync pulse" to begin the ignition firing sequence and below 700 rpm the module controls spark
advance by triggering each of the two coils at a pre-determined interval based on engine speed only. Above 700 rpm the ECM controls the spark
timing (EST) and compensates for all driving conditions. The IDI module must receive a "sync pulse" and then a crank signal in that order to
enable the engine to start. The IDI module is not repairable. When a IDI module is defective, the module is replaced as a separate component.
LOCATION
IDI Assembly.
