Other Fault Symptoms

Test Box
^ In the case of symptoms not listed in DIAGNOSIS BY SYMPTOM, it is recommended that the test box be connected and all signals measured.

^ Connect test box to (MFI) Engine Control Module and (ICM) Ignition Control Module and check ground terminals.

^ Plug modules into test box adapter.

^ Check all signals to and from both modules.

See: COMPUTERS AND CONTROL SYSTEMS / TESTING AND INSPECTION / DIAGNOSTIC CHARTS / NON-TROUBLE CODE CHARTS / ECM PINOUT & TERMINAL I.D. CHARTS.