AT5608
Accumulator Control Pressure
High
Electric Current (A)
0
1
D00060
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then
D00062
Reference
Waveform between terminals SLN
+
and SLN
-
when engine is idling.
5 V / Div.
GND
Waveform between terminals SLN
+
and SLN
-
during shift change.
5 V / Div.
GND
1 msec. / Div.
1 msec. / Div.
-
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI-193
347
Author:
Date:
2001 SIENNA (RM787U)
DTC
P1765
Linear Solenoid for Accumulator Pressure Control
Circuit Malfunction (Shift Solenoid Valve SLN)
CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure
acting on the accumulator control valve when gears are shifted
and performs smooth gear shifting.
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sen-
sor and direct clutch speed sensor and controls the volume of
current flow to the solenoid valve.
The amount of current to the solenoid is controlled by the (*)
duty ratio of ECM output signals, causing a momentary change
to the hydraulic pressure acting on the clutches during gear
shifting.
When the duty ratio is high, the hydraulic pressure acting on the
clutches is low.
DTC No.
DTC Detecting Condition
Trouble Area
P1765
After the engine is warmed up, the current flows to the shift
solenoid valve SLN for 1 sec or more under condition (a) or
(b):
(a) Engine speed: 500 rpm or more
(b) Park/neutral position switch: ON (P or N position)
Open or short in shift solenoid valve SLN circuit
Shift solenoid valve SLN
ECM
DI02Q-08