Reading Codes: Notes

All trouble codes are 2-digit numbers. PCM outputs codes one digit at a time. These codes indicate current faults in system and should be serviced in order of appearance. See TROUBLE CODE REFERENCE  under CIRCUIT TESTS to find correct CIRCUIT TEST.

Scan tester, if used, will count pulses and display them as a digital code. If using MIL, trouble codes are displayed as light pulses from CHECK ENGINE light. When using MIL, pay attention to length of pauses in order to read codes correctly. See Figure .