Without Scan Tool

When the PCM senses an abnormality in the input or output systems, the D4 indicator light in the gauge assembly will blink. When the Service Check Connector (located under the dash on the passenger side) is connected with the special tool as shown, the D4 indicator light will blink the Diagnostic Trouble Code (DTC) when the ignition switch is turned ON.








When the D4 indicator light has been reported on, connect the Service Check Connector with the special tool. Then turn ON the ignition switch and observe the D4 indicator light.




Codes 1 through 9 are indicated by individual short blinks. Codes 10 and above are indicated by a series of long and short blinks. One long blink equals 10 short blinks. Add the long and short blinks together to determine the code. After determining the code, refer to Diagnosis by Symptom.