Reading Trouble Codes
- Perform on-board diagnostic system check before diagnosing vehicle using self-diagnostic system. See appropriate ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK chart under DIAGNOSTIC CODE CHARTS.
- Ensure ignition is off. Using a jumper wire, connect between Data Link Connector (DLC) terminals TE1 and E1. See Fig 1 . DLC is located on left strut tower. Turn ignition on and observe Malfunction Indicator Light (MIL) to read fault code(s). If fault codes are stored, code will flash 3 times starting with the lowest code. Proceed to appropriate chart(s) under DIAGNOSTIC CODE CHARTS to diagnose fault codes. See SELF-DIAGNOSTICS DIRECTORY table.
- If no fault codes are stored, remove jumper wire from DLC terminal TE1. Turn ignition switch to LOCK position. Reconnect jumper wire between DLC terminals TE2 and E1. See Fig 1 . Turn ignition on. MIL will flash on and off rapidly.
- Start and run engine until normal operating temperature is obtained. Test drive vehicle at condition at which problem occurred. With ignition still on, connect jumper wire between Data Link Connector (DLC) terminals TE1 and E1, and observe MIL. Code(s) will flash if present. Proceed to appropriate chart(s) under DIAGNOSTIC CODE CHARTS to diagnose fault codes. See SELF-DIAGNOSTICS DIRECTORY table.
- If fault codes are not present, ECM and wiring are okay. Proceed to INTERMITTENTS in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
NOTE:
Test diagnostic mode will not function if DLC terminal TE2 is grounded with ignition switch in any other position than LOCK. When in test diagnostic mode, Code 42 will set if vehicle is not driven above 3 MPH, and Code 43 will set if engine is not cranked. This is considered normal. Code 51 will set if accelerator pedal depressed off the idle position for 3 seconds, gear selector in Park or Neutral (A/T), or if A/C is on (if equipped). Systems are properly functioning if Code 51 sets under these conditions.