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DI-1025
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
DIDVF-01
DTC P0751 Shift Solenoid "A" Performance
(Shift Solenoid Valve S1)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear
position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).
DTC No. DTC Detection Condition Trouble Area
S Shift solenoid valve S1 remains open or closed
The gear required by the ECM does not match the actual gear
P0751 S Valve body is blocked
when driving (2-trip detection logic)
S Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates "stuck ON malfunction" or "stuck OFF malfunction" of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
Shift solenoid valve S1/OFF malfunction
Related DTCs
R l t d DTC P0751
Shift solenoid valve S1/ON malfunction
Main Shift solenoid valve S1
Required sensors/Components Vehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed
Sub
sensor (NO)
Frequency of operation Continuous
OFF malfunction (A) and (B) 0.4 sec.
OFF malfunction (C) Immediate
ON malfunction (A), (B) and
Duration 0.4 sec.
(C)
ON malfunction (D) 3 sec.
ON malfunction (E) 0.5 sec.
MIL operation 2 driving cycles
Sequence of operation None
DI-1026
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
All:
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 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
Not circuit malfunction
circuit
KCS sensor circuit Not circuit malfunction
ETCS (Electric throttle control system) Not system down
Transmission range "D"
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