Circuit Description
WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
The Transaxle Control Module (TCM) and the Engine Control Module (ECM) are connected through the serial data link circuit. The TCM sends a P-code status message to the ECM every 100 milliseconds to confirm the transaxle is functioning correctly.
If the TCM detects either an A- or B-type malfunction within the transaxle, the TCM will send to the ECM a P-code status message to turn the Malfunction Indicator Lamp (MIL) ON and set DTC P0700.