For 1990-2009 cars only
Circuit Description
The IPC monitors the tachometer sent by the PCM through CKT 121 (WHT). The IPC software controls one of the following two display types:
| • | A message display with a digital IPC |
| • | An analog gauge with an analog IPC, consisting of a needle pointer |
The IPC interpolates and scales the tachometer information received from the PCM.
Diagnostic Aids
- Connect a scan tool to the DLC.
- Test for any set DTCs if no DTCs are set current.
- Test CKT 121 (WHT) for an open or short.
