Without Scan Tool

A Diagnostic Trouble Code (DTC) indicates the PCM has recognized an abnormal condition in the system.


The technician can display DTC's in two ways. The first way is to cycle the ignition switch and count the number of times the malfunction indicator (Check Engine) lamp on the instrument panel flashes on and off.

The DRB scan tool provides the second method of displaying DTC's. Diagnostic trouble codes are the results of a system or circuit failure, but do not directly identify the failed component or components.

WARNING: APPLY PARKING BRAKE AND/OR BLOCK WHEELS BEFORE PERFORMING ANY TEST ON AN OPERATING ENGINE.

OBTAINING DIAGNOSTIC TROUBLE CODES
Using Scan Tool
1. Connect DRB scan tool to the data link (diagnostic) connector located in the passengers compartment, below the center of instrument cluster on the drivers side (Fig. 1).
2. Turn the ignition switch on, access Read Fault Screen. Record all the DTC's shown on the DRB scan tool. Observe the malfunction indicator (check engine) lamp on the instrument panel. The lamp should light for 2 seconds then go out (bulb check).
3. To erase DTC's, use the Erase Trouble Code data screen on the DRB scan tool.

Using The Malfunction Indicator Lamp (MIL)
1. Cycle the ignition key On - Off - On - Off - On within 5 seconds.
2. Count the number of times the MIL (check engine lamp) on the instrument panel flashes on and off. The number of flashes represents the trouble code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate individual two digit trouble codes.