Self-Test (Quick Test Self-Test)
QUICK TEST SELF-TESTING is divided into 2 specialized test: KEY ON/ENGINE OFF, and KEY ON/ENGINE RUNNING. The SELF-TEST is not a conclusive test by itself, but is used as part of the functional QUICK TEST diagnostic procedure.
The processor stores the SELF-TEST program in its permanent memory. When activated, it checks the IVSC system by testing functional capability and verifies that various sensors and actuators are connected and operating properly.
The KEY ON, ENGINE OFF and ENGINE RUNNING test are functional tests which only detect faults present at time of SELF-TEST. The following explains these test procedures:
- Key On, Engine Off Test - A test of the IVSC system is conducted with power applied and engine at rest. The fault must be present at the time of testing for errors to be detected in this test.
- Key On, Engine Running Test - A test of the IVSC system is conducted with engine running. The system is checked under actual operating conditions and at normal operating temperatures. The actuators are exercised and checked for corresponding results.
- Service Codes - The EEC-IV system communicates service information to the panel display by way of SELF-TEST service codes. These service codes are 2-digit numbers representing the results of the SELF-TEST. The service codes are transmitted on the SELF-TEST output (found in the SELF-TEST connector) in the form of timed pulses, and read on a voltmeter or on a STAR tester. See Fig 1 .