- Short in shift solenoid valve S2 circuit
- Shift solenoid valve S2
- ECM
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Drivetrain | Section: Automatic Transmission/Transaxle | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000W87042X |
| Title: A750E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
P0976 |
Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2) |
|
DTC |
P0977 |
Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2) |
DESCRIPTION
Shifting from 1st to 5th is performed in combination with the "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2 and SR which is controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the Fail-Safe Chart
.)
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0976 |
ECM detects short in solenoid valve S2 circuit 2 times when solenoid valve S2 is operated (1-trip detection logic) |
|
|
P0977 |
ECM detects open in solenoid valve S2 circuit 2 times when solenoid valve S2 is not operated (1-trip detection logic) |
|
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S2 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. When the shift solenoid valve S2 is on, if its resistance is 8 Ω or less, the ECM determines there is a short in the shift solenoid valve S2 circuit.
When the shift solenoid valve S2 is off, if its resistance is 100 kΩ or more, the ECM determines there is an open in the shift solenoid valve S2 circuit
.
MONITOR STRATEGY
|
Related DTCs |
P0976: Shift solenoid valve S2/Range check (Low resistance) P0977: Shift solenoid valve S2/Range check (High resistance) |
|
Required sensors/Components |
Shift solenoid valve S2 |
|
Frequency of operation |
Continuous |
|
Duration |
0.128 seconds or more |
|
MIL operation |
1 driving cycle |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
The monitor will run whenever the following DTCs are not present |
None |
P0976: Range Check (Low Resistance)
|
Shift solenoid valve S2 |
ON |
P0977: Range Check (High Resistance)
|
Shift solenoid valve S2 |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
P0976: Range Check (Low Resistance)
|
Shift solenoid valve S2 resistance |
8 Ω or less |
P0977: Range Check (High Resistance)
|
Shift solenoid valve S2 resistance |
100 kΩ or more |
COMPONENT OPERATING RANGE
|
Shift solenoid valve S2 resistance |
11 to 15 Ω at 20°C (68°F) |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in D.
|
ECM gear shift command |
1st |
2nd |
3rd |
4th |
5th |
|
Shift solenoid valve S2 |
OFF |
ON |
ON |
OFF |
OFF |
PROCEDURE
|
1. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2) |
|
(a) Disconnect the D41 transmission wire connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
15 (S2) - Body ground |
20°C (68°F) |
11 to 15 Ω |
|
|
2. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
|
(a) Disconnect the D56 ECM connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D56-4 (S2) - Body ground |
20°C (68°F) |
11 to 15 Ω |
|
|
3. |
INSPECT SHIFT SOLENOID VALVE S2 |
|
(a) Remove the shift solenoid valve S2. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Shift solenoid valve S2 connector terminal - Shift solenoid valve S2 body |
20°C (68°F) |
11 to 15 Ω |
(c) Connect the battery positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid valve body. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.
|
|
|