Toyota ZZT230 series Repair Manual page 461

Dl-250
DTC P0770
SYSTEM DESCRIPTION
The uses the signals from the throttle position sensor, air-flow meter and crankshaft position sensor
ECM
to monitor the engagement 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
memory to detect mechanical trouble of the shift solenoid valve
ECM
clutch or automatic transaxle (clutch, brake or gear etc.).
OTGNo.
• Lock-up does not occur when driving in the lock-up range
(normal driving at 80 kmlh
in the lock-up OFF range.
P0770
(2--lrip detection logic)
• When lock-up is ON, clutch
(2--lrip detection logic)
INSPECTION PROCEDURE
1
N
Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
OTC Detecting Condition
mph)), or lock-up remains ON
!50
brake slips or gear is broken.
or
operati o n
SL
PREPARATION:
Remove the oil pan.
(a)
Remove the solenoid valve
(b)
CHECK:
Applying
(a)
check that the solenoid valve does not leak air.
When battery positive voltage is supplied to the shift sole­
(b}
noid valve, check that the solenoid valve opens.
OK:
(a) Solenoid valve does leak air.
G I
(b) Solenoid valve opens.
007&69
-
valve body and torque converter
SL,
• 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.)
kgf/cm2, 71 psi) of compressed air,
490 kPa (5
Replace the solenoid valve SL.
Trouble Area
SL.