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Home >> Lexus >> 2010 >> IS 350 >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Automatic Transmission (A760H) (Diagnostic Codes (P0500-U0100) & Circuit Tests)) >> Automatic Transmission System >> DTC P0781: 1-2 Shift (1-2 Shift Valve) >> Typical Enabling Conditions

Typical Enabling Conditions

WARNING: This page is about a different car, the 2010 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
THE FOLLOWING ITEMS ARE COMMON TO ALL CONDITIONS BELOW.

The monitor will run whenever this DTC is not present.
(Not circuit malfunction)
P0717 (Turbine speed sensor circuit)
P0500 (Output speed sensor circuit)
P0973, P0974 (Shift solenoid valve S1 circuit)
P0976, P0977 (Shift solenoid valve S2 circuit)
P0979, P0980 (Shift solenoid valve S3 circuit)
P0982, P0983 (Shift solenoid valve S4 circuit)
P0985, P0986 (Shift solenoid valve SR circuit)
P0748 (Shift solenoid valve SL1 circuit)
P0778 (Shift solenoid valve SL2 circuit)
P0115, P0116, P0117, P0118, P011B (ECT sensor circuit)
P0327, P0328, P0332, P0333 (KCS sensor circuit)
Turbine speed sensor circuit Not circuit malfunction
Output speed sensor circuit Not circuit malfunction
Shift solenoid valve S1 circuit Not circuit malfunction
Shift solenoid valve S2 circuit Not circuit malfunction
Shift solenoid valve S3 circuit Not circuit malfunction
Shift solenoid valve S4 circuit Not circuit malfunction
Shift solenoid valve SR circuit Not circuit malfunction
Shift solenoid valve SL1 circuit Not circuit malfunction
Shift solenoid valve SL2 circuit Not circuit malfunction
ECT (Engine coolant temperature) sensor circuit Not circuit malfunction
KCS sensor circuit Not circuit malfunction
ETCS (Electric throttle control system) Not system down
Transmission range "D"
ECT 40°C (104°F) or more
Spark advance from Max. retard timing by KCS control 0°CA or more
Engine Starting
CONDITION (A):

ECM selected gear 2nd
Vehicle speed 1.2 mph (2 km/h) or more
Output speed 2nd → 1st down shift point or more
Throttle valve opening angle 6.5% or more at 2,000 rpm
(Conditions vary with engine speed)
CONDITION (B):

ECM selected gear 4th
Vehicle speed 1.2 mph (2 km/h) or more
Throttle valve opening angle 6.5% or more at 2,000 rpm
(Conditions vary with engine speed)
CONDITION (C):

Current ECM selected gear 5th
Last ECM selected gear 4th
Vehicle speed (During transition from 4th to 5th gear) Less than 62.2 mph (100 km/h)
CONDITION (D):

ECM selected gear 5th
Engine speed -Turbine speed (NE - NT)
(After transition to 5th gear)
150 rpm or less
Vehicle speed (After transition to 5th gear) Less than 62.2 mph (100 km/h)