DTC Confirmation Test

A/T communication line is used to control transmission shifting during hard acceleration or deceleration. DTC P0600 will set when ECM receives incorrect voltage from Transmission Control Module (TCM) continuously. Possible causes are:

• Communication line circuit open or shorted.
• Defective TCM.
• Weak battery.

To set DTC, turn ignition on. Select DATA MONITOR with scan tool. Start engine and let it idle for at least 2 seconds. If DTC is detected, go to PROCEDURE .