Reading Diagnostic Trouble Codes

When the Malfunction Indicator Lamp (MIL) has been reported on, do the following:

Data Link Connector / Service Check Connector:

1. Connect the Service Check Connector terminals with a jumper wire as shown. (The 2P Service Check Connector is located under the dash on the passenger side of the car.) Turn the Ignition Switch on.

Malfunction Indicator Lamp / Check Engine Light:

2. Note the Diagnostic Trouble Code (DTC): The MIL indicates a code by the length and number of blinks. The MIL can indicate multiple problems by blinking separate codes, one after another. Codes 1 through 9 are indicated by individual short blinks. Codes 10 through 43 are indicated by a series of long and short blinks. The number of long blinks equals the first digit, the number of short blinks equals the second digit. Sometimes the first blink is difficult to see; always count the blinks at least twice to verify the code.

Trouble Code / System Indicated:

If codes other than those listed are indicated, verify the code. If the code indicated is not listed, replace the ECM.

The MIL may come on, indicating a system problem when, in fact, there is a poor or intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary.

The MIL does not come on when there is a malfunction in the Electrical Load Detector (ELD) circuit. However, it will indicate the codes when the Service Check Connector is jumped (Except Canada).