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DIAGNOSTICS - AUTOMATIC TRANSMISSION
DI0SV-22
DTC P0753 Shift Solenoid "A" Electrical
DTC P0758 Shift Solenoid "B" Electrical
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with status (ON and OFF) of the shift solenoid valves
No. 1 and No. 2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves,
the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail
safe function).
SHIFT SOLENOID No. 1 SHIFT SOLENOID No. 2 BOTH SOLENOIDS
NORMAL
MALFUNCTIONING MALFUNCTIONING MALFUNCTIONING
Position Solenoid valve Solenoid valve Solenoid valve Gear when shift selector is
Gear Gear Gear
No. 1 No. 2 No. 1 No. 2 No. 1 No. 2 manually operated
ON OFF 1st X ON 3rd ON X 1st O/D
ON ON 2nd X ON 3rd OFF X O/D O/D
D
OFF ON 3rd X ON 3rd OFF X O/D O/D
OFF OFF O/D X OFF O/D OFF X O/D O/D
ON OFF 1st X ON 3rd ON X 1st 3rd
2 ON ON 2nd X ON 3rd OFF X 3rd 3rd
OFF ON 3rd X ON 3rd OFF X 3rd 3rd
ON OFF 1st X OFF 1st ON X 1st 1st
L
ON ON 2nd X ON 2nd ON X 1st 1st
X: Malfunctions
HINT:
Check the shift solenoid valve No. 1 when DTC P0753 (Shift Solenoid "A" Electrical) is output and check the
shift solenoid valve No. 2 when DTC P0758 (Shift Solenoid "B" Electrial) is output.
DTC No. DTC Detecting Condition Trouble Area
The ECM checks for an open or short circuit in the shift sole-
noid valve No. 1 or No. 2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition 1. or 2. is
detected once, but it does not light up MIL.
After ECM detects condition 1. or 2. continuously 8 times or
more in one-trip, it causes the MIL light up until condition 1. or S Open or short in shift solenoid valve No. 1/No. 2 circuit
P0753
2. disappears. S Shift solenoid valve No. 1/No. 2
P0758
After that, if the ECM detects condition 1. or 2. once, it starts S ECM
lighting up MIL again.
1. Solenoid resistance is 8 or less (short circuit) when the
solenoid is energized.
2. Solenoid resistance is 100 k or more (open circuit) when
the solenoid is not energized.
2002 4RUNNER (RM887U)
Author : Date : 362
DI-187
DIAGNOSTICS - AUTOMATIC TRANSMISSION
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table above. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunctioning, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the table above must be done (In the case of a short circuit, the ECM stops send-
ing current to the short circuited solenoid).
WIRING DIAGRAM
ECM
Transmission
Shift Solenoid
Valve No. 1 3
W 4 P-L
E9 S1
Shift Solenoid
Valve No. 2
2
B 8 L-W
E9 S2
D10503
INSPECTION PROCEDURE
1 Measure resistance between terminal S1 or S2 of ECM and body ground.
PREPARATION:
Disconnect the connector from ECM.
CHECK:
Measure resistance between terminal S1 or S2 of ECM and
body ground.
OK:
Resistance: 11 - 15 at 20
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