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Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> Automatic Transmission System >> DTC P0781 1-2 Shift (1-2 Shift Valve) >> Typical Enabling Conditions

Typical Enabling Conditions

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TYPICAL ENABLING CONDITIONS

The monitor will run whenever this DTC is not present. P0500 (VSS)
P0748 - P0798 (Trans solenoid (range))
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) 

TYPICAL ENABLING CONDITIONS

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) 

TYPICAL ENABLING CONDITIONS

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) 

TYPICAL ENABLING CONDITIONS

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) 

TYPICAL ENABLING CONDITIONS

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)