DESCRIPTION Changing gears is performed by the ECM turning the solenoid (SL1, SL2, SL3, SL4, SL5 and SL6) valves on and off.
If
an open or short occurs in any of the solenoid valve circuits, the ECM
controls the remaining normal solenoid valves to allow the vehicle to be
driven. If all of the solenoid valves are malfunctioning, only the
mechanical fluid pressure circuit will function and some manual
operation will be possible. If an open or short occurs in a solenoid
valve circuit, the ECM cuts power to the malfunctioning solenoid valve. HINT:
The following table shows normal operation of the solenoid (SL3) valve when the shift lever is in D. Solenoid Valve Operation: |
Gear | 1st |
2nd | 3rd |
4th | 5th |
6th | 7th |
8th | | Solenoid (SL3) Valve |
OFF | OFF |
ON | OFF |
OFF | OFF |
ON | OFF | |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Memory |
Note | | P079512 |
Pressure Control Solenoid "C" Circuit Short to Battery |
While
the vehicle is being driven so that gear changes occur, a short to +B
is detected in the solenoid (SL3) valve circuit for 1 second (1-trip
detection logic). |
- Solenoid (SL3) valve
- Transmission wire
- Harness and connector
- ECM
| Comes on |
DTC stored | SAE Code:
P0971 | MONITOR DESCRIPTION
This
DTC indicates a short to +B in the solenoid (SL3) valve circuit. The
ECM commands gear shifts by turning the solenoid valves on or off. When
there is an open or short in any solenoid valve circuit, the ECM detects
the problem, illuminates the MIL and stores a DTC. The
ECM performs the fail-safe function and turns the other normal solenoid
valves on or off. In the case of an open or short circuit, the ECM
stops sending current to the open or shorted solenoid. MONITOR STRATEGY |
Related DTCs | P0971: Solenoid (SL3) valve/Range check (High current) | |
Required sensors/components | Solenoid (SL3) valve | |
Frequency of operation | Continuous | |
Duration | 1 sec. | |
MIL operation | Immediate | |
Sequence of operation | None | TYPICAL ENABLING CONDITIONS All |
The monitor will run whenever the following DTCs are not stored |
None | | Solenoid current cut status |
Not cut | | Engine switch |
On (IG) | | Starter |
OFF | | Battery voltage |
10.5 V or more | Condition (A) |
Battery voltage | 8 V or more and less than 12.499 V | |
Target current (0.1 sec. or more) | 0.8 A or less | Condition (B) |
Battery voltage | 12.5 V or more and less than 16 V | |
Target current (0 sec. or more) | 1 A or less | TYPICAL MALFUNCTION THRESHOLDS
Any of the following conditions are met: Condition (A) or (B) Condition (A) |
Battery voltage | 8 V or more and less than 12.499 V | |
Solenoid current | More than 0.92 A | Condition (B) |
Battery voltage | 12.5 V or more and less than 16 V | |
Solenoid current | More than 1.1 A | COMPONENT OPERATING RANGE
Both of the following conditions are met: Condition (A) and (B) Condition (A) |
Battery voltage | 8 V or more and less than 12.499 V | |
Solenoid current | 0.92 A or less | Condition (B) |
Battery voltage | 12.5 V or more and less than 16 V | |
Solenoid current | 1.1 A or less | CONFIRMATION DRIVING PATTERN
CAUTION: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- After repairs have been completed, clear the DTCs and then check that
the vehicle has returned to normal by performing the following All
Readiness check procedure.
- When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here 
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
- Start the engine.
- Perform the D Position Shift Test inspection in Road Test. [*1]
Click here
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Stop the vehicle.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: P079512.
- Check the DTC judgment result.
|
Techstream Display |
Description |
|
NORMAL |
- DTC judgment completed
- System normal
|
|
ABNORMAL |
- DTC judgment completed
- System abnormal
|
|
INCOMPLETE |
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
|
N/A |
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- Perform the universal trip to clear permanent DTCs.
Click here
- Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here
PROCEDURE |
1. | CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SOLENOID (SL3) VALVE) - ECM) |
(a) Disconnect the C56 ECM connector. (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
C56-6 (SL3+) or C56-7 (SL3-) - Other terminals |
Always | 10 kΩ or higher |
| NG |
 | GO TO STEP 3 |
|
OK |
 | |
(a) Replace the ECM.
Click here
| NEXT |
| PERFORM REGISTRATION |
| 3. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
(a) Disconnect the C52 transmission wire connector. (b) Disconnect the C56 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
C52-7 (SL3+) or C56-6 (SL3+) - Other terminals |
Always | 10 kΩ or higher | |
C52-6 (SL3-) or C56-7 (SL3-) - Other terminals |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
|
OK | |
| |
| 4. |
INSPECT SOLENOID (SL3) VALVE |
| (a) Remove the solenoid (SL3) valve. Click here
|
 |
|
*a | Component without harness connected
(Solenoid (SL3) Valve) | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
Solenoid (SL3) valve connector terminal 1 - terminal 2 |
20°C (68°F) | 5.0 to 5.6 Ω |
(c)
Connect a positive (+) lead from the battery with a 21 W bulb to
terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve
connector. Check that the valve moves and makes an operating sound. OK:
Valve moves and makes an operating sound.
| OK |
| REPAIR OR REPLACE TRANSMISSION WIRE |
| NG |
| REPLACE SOLENOID (SL3) VALVE | | 
