Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 410 / 1976

Q04874
Controlled
Pressure
Line
Pressure
Controlled
Pressure
Drain
D02333
(+)
(-)
(+)
(-)
- DIAGNOSTICS AUTOMATIC TRANSAXLE
DI-185
339
Author: Date:
2001 SIENNA (RM787U)
DTC P0770 Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-
flow meter and crankshaft position sensor to monitor the en-
gagement condition of the lock-up clutch.
Then the ECM compares the engagement condition of the
lock-up clutch with the lock-up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body and torque converter clutch or automatic transaxle
(clutch, brake or gear etc.).
DTC No. DTC Detecting Condition Trouble Area
P0770
Lock-up does not occur when driving in the lock-up range
(normal driving at 80 km/h
[
50 mph
]
), or lock-up remains ON
in the lock-up OFF range.
(2-trip detection logic)
When lock-up is ON, clutch or brake slips or gear is broken.
(2-trip detection logic)
Shift solenoid valve SL is stuck open or closed
Valve body blocked up or stuck
Lock-up clutch
Automatic transaxle (clutch, brake or gear etc.)
INSPECTION PROCEDURE
1 Check solenoid valve SL operation.
PREPARATION:
(a)
Remove the oil pan.
(b) Remove the shift solenoid valve SL.
CHECK:
(a)
Applying 490 kPa (5 kgf/cm
2
, 71 psi) of compressed air,
check that the solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valve, check that the solenoid valve opens.
OK:
(a) Solenoid valve does leak air.
(b) Solenoid valve opens.
NG Replace the solenoid valve SL.
OK
DI0CU-06