Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Acura 3.5RL 1996-2004 Approved srm RL9604S14019A
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Main Menu Table of Contents
Electronic Control System
The electronic control system consists of a Powertrain Control Module (PCM), sensors, a A/T clutch pressure control
solenoid and four solenoid valves. Shifting and lock-up are electronically controlled for comfortable driving under all con-
ditions. The PCM is located below the dashboard, under the front lower panel on the passenger's side.
PCM
Throttle Position Sensor Vehicle Speed Sensor
Signal Signal
PGM-FI
Control System
Engine Coolant Temperature
Service Check Connector
Sensor Signal
Shift Solenoid
Valve A
Shift Control Shift Solenoid
Interlock System
Valve B
A/T Clutch Pressure Control
Solenoid Valve
Torque Converter Clutch
Lock-up Control (Lock-up Control)
Solenoid Valve A
Torque Converter Clutch
(Lock-up Control)
Solenoid Valve B
Mainshaft Speed Sensor
Signal
A/T Control System
Countershaft Speed
Indicator Light Sensor Signal
Self-Diagnosis
Self-Diagnosis Signal
Function
Main Menu Table of Contents
Description
Electronic Control System (cont'd)
Shift Control
The PCM instantly determines which gear should be selected by various signals sent from sensors, and it actuates the
shift solenoid valves A and B to control shifting. Also, a Grade Logic Control System controls shifting in position while
the vehicle is ascending or descending a slope, or reducing speed.
*: See page 14-36 for reverse inhibitor control description.
Lock-up Control
From sensor input signals, the PCM determines whether to turn the lock-up ON or OFF and activates torque converter
clutch (lock-up control) solenoid valve A and/or B accordingly. The combination of driving signals to torque converter
clutch (lock-up control) solenoid valves A and B is shown in the table below.
Main Menu Table of Contents
Grade Logic Control System
How it works:
The PCM compares actual driving conditions with driving conditions memorized in the PCM, based on the input from the
vehicle speed sensor, throttle position sensor, engine coolant temperature sensor, barometric pressure sensor, brake
pedal position switch signal and shift lever position signal, to control shifting while a vehicle is ascending or descending a
slope.
Main Menu Table of Contents
Description
Electronic Control System (cont'd)
Ascending Control
When the PCM determines that the vehicle is climbing a hill in position, the system extends the engagement area of
3rd gear to prevent the transmission from frequently shifting between 3rd and 4th gears, so the vehicle can run smooth
and have more power when needed.
NOTE:
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