A/T - A340E/H Intermittent Engagement of Overdrive
Date: 1996Technical Bulletin # 351
Transmission:
A340E/H
Subject:
Intermittent engagement of O/D
Application:
Toyota, truck and 4 Runner
A34OE/H
Intermittent Engagement of Overdrive
An intermittent loss of overdrive (when the engine is at normal operating temperature and vehicle speed is above 45 mph) could be caused by high resistance in the E-17 ground splice (pre 9/90). This junction is located in the harness that is located across the front of the engine, behind the power steering reservoir (figure 1).
The connector should be cleaned and then soldered together to eliminate the crimp-style connector. Vehicles manufactured after 9/90 have the junction located at the right kick panel area, and do not have this problem. The junction for the 9/90 and later models is called I-15 (figure 2).
NOTE:
The E-17 splice is located behind the power steering pump. In most cases, it can be reached without removing components.