Toyota Tundra. Manual — part 2830
OK: REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (See REMOVAL )
DTC P0973, P0974: SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE
S1); SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1)
DESCRIPTION
Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves
SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of
the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be
operated safely. Also, the ECM stops sending current to the open or short circuited solenoid (see FAIL-SAFE
TABLE ).
DTC DETECTION CONDITION TABLE
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the
DTC. When the shift solenoid valve S1 is ON, if its resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is OFF, if its resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S1 circuit (see FAIL-SAFE TABLE ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
DTC
Code
DTC Detection Condition
Trouble Area
P0973
ECM detects short in solenoid valve S1 circuit 2 times when
solenoid valve S1 is operated (1 trip detection logic)
Short in shift solenoid
valve S1 circuit
Shift solenoid valve S1
ECM
P0974
ECM detects open in solenoid valve S1 circuit 2 times when
solenoid valve S1 is not operated (1 trip detection logic)
Open in shift solenoid
valve S1 circuit
Shift solenoid valve S1
ECM
Related DTCs
P0973: Shift solenoid valve S1/Range check (Low
resistance)
P0974: Shift solenoid valve S1/Range check (High
resistance)
Required sensors/Components
Shift solenoid valve S1
Frequency of operation
Continuous
Duration
0.128 sec. or more
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
TYPICAL ENABLING CONDITIONS
All
TYPICAL ENABLING CONDITIONS TABLE
P0973: Range Check (Low Resistance)
TYPICAL ENABLING CONDITIONS TABLE
P0974: Range Check (High Resistance)
TYPICAL ENABLING CONDITIONS TABLE
TYPICAL MALFUNCTION THRESHOLDS
P0973: Range Check (Low Resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE
P0974: Range Check (High Resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
MIL operation
1 driving cycle
Sequence of operation
None
The monitor will run whenever the following DTCs are not stored
None
Shift solenoid valve S1
ON
Shift solenoid valve S1
OFF
Shift solenoid valve S1 resistance
8 ohms or less
Shift solenoid valve S1 resistance
100 kohms or higher
Shift solenoid valve S1 resistance
11 to 15 ohms at 20°C (68°F)
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
Fig. 83: Identifying Shift Solenoid Valve S1 - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
HINT:
The shift solenoid valve S1 is turned ON/OFF normally when the shift lever is on D:
SHIFT SOLENOID VALVE S1 REFERENCE TABLE
1. INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1)
a. Disconnect the D63 No. 1 transmission wire connector.
b. Measure the resistance according to the value (s) in the table below.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION TABLE
Result
ECM gear shift command
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve S1
OFF
ON
ON
ON
ON
ON
Tester Connection
Condition
Specified
Condition
8 (S1) - Body ground
20°C (68°F)
11 to 15 ohms
Result
Proceed To
NG
A
OK (for 3UR-FE)
B
OK (for 3UR-FBE)
C
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
Fig. 84: Identifying D63 No. 1 Transmission Wire Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 3
B: OK (for 3UR-FE) (See REMOVAL
C: OK (for 3UR-FBE) (See REMOVAL
2. CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)
a. Disconnect the D74 ECM connector.
b. Measure the resistance according to the value (s) in the table below.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION TABLE
Tester Connection
Condition Specified Condition
D74-7 (S1) - Body ground 20°C (68°F)
11 to 15 ohms
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
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