Diagnostic Formats

There are 2 diagnostic formats used to test and service the EEC-IV system: QUICK TEST and CIRCUIT TESTS. QUICK TEST allows the technician to identify problems, and retrieve and record service codes. CIRCUIT TESTS check circuits, sensors and actuators.

If vehicle passes QUICK TEST, and there are no driveability symptoms or intermittent faults, the EEC-IV system is okay. Problem exists elsewhere.

Before starting any CIRCUIT TEST, follow all steps under QUICK TEST to find the correct CIRCUIT TEST.