Using Flash Code Method
Ground pin "H" to pin "A" of Data Link Connector (DLC). See Fig 1. DLC is located under center of instrument panel. Turn ignition switch to RUN position (engine off). Diagnostic display mode will remain enabled as long as pin "H" is grounded, serial data link communications has not been initiated and vehicle speed is less than 5 MPH.
About 4 seconds after DLC pin "H" is grounded, EBCM or EBTCM will begin flashing code sequence. Sequence will begin with Code 12, signaling beginning of fault code display. Each stored code will be displayed 3 times. See DIAGNOSTIC TROUBLE CODES table. After all codes have been displayed, sequence will repeat starting with Code 12. Some codes can only be read through DLC using Tech 1 scan tester. Using Tech 1 Scan Tester
Connect Tech 1 scan tester to Data Link Connector (DLC). DLC is located under instrument panel, right of steering column. Follow scan tester manufacturer's instructions to retrieve stored fault codes.
If multiple codes are displayed, begin diagnosis with code that is displayed first. See DIAGNOSTIC TROUBLE CODES table. Diagnose all codes in the order displayed by Tech 1 scan tester.
| Code | Definition |
|---|---|
| 12 | Diagnostic System Operational |
| 21 | Right Front Wheel Speed Sensor Fault |
| 22 | Right Front Toothed Wheel Frequency Error |
| 23 | Right Front Wheel Speed Sensor Continuity Fault |
| 25 | Left Front Wheel Speed Sensor Fault |
| 26 | Left Front Toothed Wheel Frequency Error |
| 27 | Left Front Wheel Speed Sensor Continuity Fault |
| 28 | Wheel Speed Sensor Frequency Error |
| 31 | Right Rear Wheel Speed Sensor Fault |
| 32 | Right Rear Toothed Wheel Frequency Error |
| 33 | Right Rear Wheel Speed Sensor Continuity Fault |
| 35 | Left Rear Wheel Speed Sensor Fault |
| 36 | Left Rear Toothed Wheel Frequency Error |
| 37 | Left Rear Wheel Speed Sensor Continuity Fault |
| 41 | Right Front ABS Valve Solenoid Fault |
| 44 | Right Front TCS Pilot Valve Fault |
| 45 | Left Front ABS Valve Solenoid Fault |
| 48 | Left Front TCS Pilot Valve Fault |
| 51 | Right Rear ABS Valve Solenoid Fault |
| 55 | Left Rear ABS Valve Solenoid Fault (TCS) |
| 55 | Rear ABS Valve Solenoid Fault (Non-TCS) |
| 61 | Pump Motor Or Pump Motor Relay Fault |
| 63 | Valve Relay Fault |
| 67 | Brakelight Switch Fault (TCS) |
| 71 | EBCM Or EBTCM Fault |
| 72 | EBCM Or EBTCM Serial Data Fault |
| 73 | PCM-EBTCM PWM Signal Fault (4.6L) |
| 83 | Brake Fluid Level Low (TCS) |