Diagnostic Quick Test

CAUTION: Although Diagnostic Quick Test appears to be a fast and powerful diagnostic aid, it unfortunately cannot detect all possible failures that can occur within the system. Therefore, the Diagnostic Quick Test procedure has been carefully constructed to also guide you and refer you to Pinpoint Tests that inspect components and circuitry associated with a particular symptom.

NOTE: Keep in mind that all the things that previously went wrong with vehicles, before the age of electronics reached the automobile, can still go wrong and are still the cause of the majority of the driveability problems. The best diagnosis starts with a list of symptoms and possible causes, followed by a careful checking of those causes in the most probable order. Refer to Symptom Charts for a list of symptoms and probable causes. Reading Diagnostic Trouble Codes

Diagnostic Quick Test is a check of the system electronics, which utilizes the control module of the system to perform its own diagnostics on itself and its circuitry. This module capability is referred to as Diagnostic Test Mode. Little effort is required by the technician to initiate Diagnostic Test Mode, allowing vital information to be retrieved quickly. Thus the overall procedure is referred to as Diagnostic Quick Test.

DIRECTION
When directed to Diagnostic Quick Test, perform all of the Diagnostic Quick Tests step-by-step following directions in the Action To Take column. If all phases of Diagnostic Quick Test give no indication of a problem, it is likely that the problem is non-electronic related and will be found elsewhere. You should refer to Symptom Charts, Step 3: No DTC(s) Present Symptom Chart, for the next possible fault for that particular symptom. Step 3: No DTC(s) Present Symptom Chart

When directed to a Pinpoint Test, always read for special notes and look carefully at the pinpoint schematic. When a repair has been made, erase the codes, perform the OBD II drive cycle, and rerun the Diagnostic Quick Test to confirm the repair was effective. Bi-Fuel Models (Bi-Fuel/CNG System)