DTC Confirmation Test

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

A/T control circuits are used to control shifting during hard acceleration or deceleration. Malfunction is detected when PCM receives incorrect voltage from A/T control portion of the PCM. Possible causes are:

The communication line circuit between ECM and TCM (Transmission Control Module) is open or shorted.
Dead (Weak) battery.
Defective TCM (Transmission Control Module).

Connect scan tool to Data Link Connector (DLC). See Figure . Turn ignition on. Using scan tool, select DATA MONITOR. Wait at least 40 seconds. If first trip DTC is sets, perform DIAGNOSTIC PROCEDURE . If first trip DTC is not set, problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM.