Entering & Exiting Diagnostic Mode
NOTE:
The Assembly Line Data Link (ALDL) may also be referred to as the Data Link Connector (DLC) in flow charts.
- With key on and engine off, connect a jumper wire between ALDL terminal "B" (test terminal) and terminal "A" (ground). See Fig 1. This places control module into diagnostic mode.
- In this mode, control module will display Code 12 by flashing SERVICE ENGINE SOON (SES) light. Code 12 is identified by SES light flashing once, followed by a short pause, then 2 flashes in quick succession.
- Code 12 will be displayed 3 times. If no other codes are stored, Code 12 will continue to flash until test terminal is ungrounded. To exit diagnostic mode, turn ignition off and remove jumper wire from ALDL connector.