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Last Modified: 9-16-2014 6.6 C Doc ID: RM000000XP10BKX Model Year: 2015 Model: Tundra Prod Date Range: [08/2014 - ] Title: A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0781; 1-2 Shift (1-2 Shift Valve); 2015 MY Tundra [08/2014 - ] DTC P0781 1-2 Shift (1-2 Shift Valve) DESCRIPTION The 1-2 shift valve performs shifting to 1st gear and other gears. When shifting to 2nd and 4th gears is impossible, or when the ECM directs the transmission to switch to 5th or 6th gear and the engine overruns (clutch slips), this DTC is stored. DTC CODE DTC DETECTION CONDITION TROUBLE AREA P0781 Conditions (a) and (b), or (a) and (c) are met (2-trip detection logic): (a) When the ECM directs the transmission to switch to 2nd gear, the actual gear is shifted to 1st. (b) When the ECM directs the transmission to switch to 4th gear, the actual gear is shifted to 3rd. (c) When the ECM directs the transmission to switch to 5th gear, the engine overruns (clutch slips). Valve body is blocked or stuck (1-2 shift valve) Shift solenoid valve SLT remains open or closed Automatic transmission (clutch, brake, gear, etc.) HINT: 1st 2nd 3rd 4th 5th 6th Actual gear position under malfunction 1st 1st 3rd 3rd N* N* N*: Neutral Gear position during fail-safe operation: If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear positions as shown in the table below. Gear position under normal conditions 1st 2nd 3rd 4th 5th 6th Actual gear position under fail-safe mode 1st* 1st* 3rd 3rd 3rd 3rd HINT: 1st*: Under engine braking, downshifting to 1st or 2nd gear is prohibited. MONITOR DESCRIPTION This DTC indicates that the 1-2 shift valve in the valve body is locked in the direction the spring compresses. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF and switching oil pressure to the valves in the valve body. A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS... |