Flow of Diagnosis

Flow of Diagnosis:

1 Get accurate description of complaint. Road test the vehicle to verify condition. Perform underhood inspection.
VISUALLY CHECK:
Vacuum hoses for splits, kinks and proper routing.
Ignition for cracking, hardness and proper connections at both the distributor and the spark plugs.
All wiring for proper connections, pinches and cuts.
Wiring harness for proper routing.
Check for missing components.
2 Check TSB'S for intermittents, updated diagnostic procedures, warranty and recall information.
3 Regardless if it is intermittent, flashing or solidly lit this is the light on the instrument cluster which indicates a problem in one of the Electronic Control Module (ECM) circuits.
4 EEC IV QUICK TEST: This test will direct you to perform the necessary Self-Diagnostic procedures. This will pull any codes that have been stored in the computer's memory. The QUICK TEST will direct you to either PIN POINT TEST or DIAGNOSIS BY SYMPTOM in COMPUTERIZED ENGINE CONTROLS for further testing.
5 Code 11 indicates a PASS code (no codes stored) and code 10 is the SEPARATOR code (end of stored codes). Codes other than 11 or 10 would indicate a fault in that circuit to the ECM.
6 PIN POINT TEST: This is where actual component testing takes place. The PIN POINT TEST will provide testing procedures for sensors or actuators based on the results of previous test procedures (QUICK TEST).
DIAGNOSIS BY SYMPTOM: You may be directed to this section by either the QUICK TEST or PIN POINT TEST. If either of these test indicate there are no computer related problems they may direct you to this section to correct faults not related to the EEC IV system.
7 See DIAGNOSIS BY SYMPTOM - EMISSION RELATED under TESTING PROCEDURES for symptom vehicle is exhibiting. Follow the procedures as outlined for given symptom.