P1600

Wiring Diagram:

CIRCUIT DESCRIPTION
The serial data line is pulled up to about 5 V by ECM and TCM transmits information to ECM through it by controlling its grounding.

TCM constantly sends information while ignition switch is ON as to whether judgement was made or not with respect to all detectable DTCs as well as whether or not abnormality exists after judgement.

Detecting Condition / Possible Cause:

DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF
2. Clear DTC with ignition switch ON.
3. Start engine and run it at idle for 1 min.
4. Select "DTC" mode on scan tool and check DTC.

Inspection (Steps 1 - 4):