Retrieving Diagnostic Trouble Codes (Quick Test): Description

Quick Test checks the integrity and function of the Electronic EC System, and outputs the test results when requested by a scan tool. Quick Test also provides a quick end check of the powertrain control system, and is usually performed at the start of each diagnostic procedure with all accessories off. Quick Test is also performed at the end of diagnostic tests for verification of repair and to ensure no other faults were incurred while repairing a previous fault. A SYSTEM PASS will be displayed when no DTCs are output and a scan tool communication error does not exist. SYSTEM PASS means that hardware monitored by the PCM is functioning within normal operating limits. Only a SYSTEM PASS, DTC or an incomplete OBD-II drive cycle (P1000) will be displayed.

The following procedures are functional tests of EEC-V system. These basic test steps MUST be followed in sequence to avoid misdiagnosis:

• Perform visual check. See VISUAL CHECK  .
• Connect appropriate scan tool to DLC. See VEHICLE PREPARATION & EQUIPMENT HOOK-UP  . Use DVOM, breakout box and transmission tester as instructed.
• Perform KOEO self-test. See KEY ON ENGINE OFF (KOEO) SELF-TEST  . Record and repair DTCs. Repeat KOEO self-test until no hard DTCs are present.
• Perform KOER self-test. See KEY ON ENGINE RUNNING (KOER) SELF-TEST  . Record and repair DTCs. Repeat KOER self-test until no hard DTCs are present.
• Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  . Test drive vehicle. Record and repair continuous memory DTCs. See CONTINUOUS MEMORY SELF-TEST  . Continue to clear DTCs, test drive vehicle and check for memory DTCs until memory DTCs are no longer present.