![]() ![]() Fill the transmission through the refill hole until fluid begins to trickle out from theĥ. Remove the refill plug and overflow plug.ģ. Lift the vehicle up while keeping a level state.Ģ. Procedure for an entire transmission fill:ġ. The fluid fill procedure needs to be performed within a specific temperature range and is accomplished in the following manner. A fluid level check plug is located in the bottom pan as seen in figure 9. In figures 3 and 4, there are two possible fluid fill locations. If checking this switch while in operation (connector plugged in and you are back probing wire 17), there will be less than 1 volt on this wire in 1st through 5th gears and will read near 12 volts in 6th, 7th and 8th. The Transmission Pressure Switch (TPS1- figure 8) is a normally open pressure switch. in the chart indicates placing your negative meter lead to a good known body ground. When checking these sensors with an O-scope, set tool to 5 Volt divisions at 2 milliseconds. These Hall sensors are supplied with battery voltage. The SP2 sensor is the Output Shaft Speed Sensor excited by the rear planetary ring gear integral to the output shaft. The NC3 is an Intermediate Shaft Speed Sensor and is excited by the C3 Clutch Drum. The NT is the Turbine or Input shaft speed sensor which is excited by teeth on the input shaft. There are 3 speed sensors in this transmission (figure 7). Solenoid resistance values are checked at 20☌ (68☏). A chart in figure 6 can be used for bench testing the internal electrical components. Clutch pressure should be close to line at full applyĪnother plus is the computer is mounted externally so the external wires going to the transmission (figure 5) allows for checking speed sensor signals and solenoid commands. Drive stall: 213-241psi and Reverse stall: 226-254psi. From a diagnostic stand point to have all these taps available is terrific. Unlike the ZF8HP transmission, this unit has a pressure tap for each of the clutch and brake assemblies as well as for lube pressure and main line pressure (figures 3 and 4). This article is designed to get you familiar with this unit so this doesn’t happen to you. It is almost easier to list the vehicles not using this transmission as opposed to those that do.īut the TL-80SN is a sleeper in that you do not hear much about the transmission but then you suddenly have one come into your shop and you do not know much about it. Lexus refers to this transmission as the AA80E transmission.Ī year later ZF released their 8 speed transmission (figure 2) in BMW’s 760Li vehicle and is making quite a splash these days. It is being used in a variety of Lexus vehicles as far back as 2007 and is now in the 2014 Cadillac CTS. The longitudinally mounted 8 speed automatic transmission called the TL-80SN (figure 1) is one of these transmissions. The Aisin AW Co., LTD has consistently been the first to market with several different types of automatic transmissions. ![]()
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