|
|
AT-68 [EURO-OBD] TROUBLE DIAGNOSIS — BASIC INSPECTION JUDGEMENT OF LINE PRESSURE TEST Road Test ECS00976 DESCRIPTION ● The purpose of the test is to determine overall performance of A/ ● The road test consists of the following three parts: 1. Check before engine is started 2. Check at idle 3. Cruise test ● Before road test, familiarize yourself with all test procedures and ● Conduct tests on all items until specified symptom is found. Judgement Suspected parts At idle Line pressure is low in all positions. ● Oil pump wear ● Control piston damage ● Pressure regulator valve or plug sticking ● Spring for pressure regulator valve damaged ● Line pressure leakage between oil strainer and pressure regulator valve ● Clogged strainer Line pressure is low in particular posi- ● Line pressure leakage between manual valve and particular clutch ● For example, line pressure is: − Low in “R” and “1” positions, but − Normal in “D” and “2” positions. Therefore, fluid leakage exists at or around low and reverse brake circuit. Refer to . Line pressure is high. ● Maladjustment of throttle position sensor ● A/T fluid temperature sensor damaged ● Line pressure solenoid valve sticking ● Short circuit of line pressure solenoid valve circuit ● Pressure modifier valve sticking ● Pressure regulator valve or plug sticking ● Open in dropping resistor circuit At stall Line pressure is low. ● Maladjustment of throttle position sensor ● Line pressure solenoid valve sticking ● Short circuit of line pressure solenoid valve circuit ● Pressure regulator valve or plug sticking ● Pressure modifier valve sticking ● Pilot valve sticking SAT786A SAT496G |