U441E AUTOMATIC TRANSMISSION / TRANSAXLE  AUTOMATIC TRANSAXLE SYSTEM  P0787  Shift / Timing Solenoid Low (Shift Solenoid Valve ST)  P0788  Shift / Timing Solenoid High (Shift Solenoid Valve ST)  


DESCRIPTION

The shift solenoid valve ST is switched OFF-ON-OFF in accordance with signals from the ECM when up-shifting and down-shifting between the 3rd and the 4th gears. This reduces the shock of gear shifting between these positions.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0787 Shift / Timing Solenoid Low (Shift Solenoid Valve ST) ECM detects short in solenoid valve ST circuit 4 times when solenoid valve ST is operated (1-trip detection logic)
·

Short in shift solenoid valve ST circuit

·

Shift solenoid valve ST

·

ECM


Comes on DTC stored
P0788 Shift / Timing Solenoid High (Shift Solenoid Valve ST) ECM detects open in solenoid valve ST circuit 4 times when solenoid valve ST is not operated (1-trip detection logic)
·

Open in shift solenoid valve ST circuit

·

Shift solenoid valve ST

·

ECM


Comes on DTC stored

MONITOR DESCRIPTION

When there is an open or short circuit in the shift solenoid valve circuit, the ECM detects the problem and the MIL comes on.

WIRING DIAGRAM

C243326E42
0.979,1.958 1.292,2.125 0.313,0.167 10 false B55 0.979,2.115 2.167,2.292 1.188,0.177 10 false Transmission Wire 6.021,2.177 6.375,2.344 0.354,0.167 10 false ECM 5.833,1.094 6.031,1.25 0.198,0.156 10 false ST 5.438,1.094 5.75,1.313 0.313,0.219 10 false B56 5.49,0.906 5.854,1.25 0.365,0.344 10 false 80 2.292,1.219 2.49,1.375 0.198,0.156 10 false ST 2.615,0.99 2.708,1.146 0.094,0.156 10 false 2 1.146,1.333 2.042,1.646 0.896,0.313 10 false Shift Solenoid Valve ST

CAUTION / NOTICE / HINT

NOTICE:

Perform initialization when parts related to the automatic transaxle are replaced.

Click hereDrivetrain>U441E AUTOMATIC TRANSMISSION / TRANSAXLE>AUTOMATIC TRANSAXLE SYSTEM>PRECAUTION


PROCEDURE

1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE ST)
a.
C229166C09
2,0.927 2.573,0.469 true 2.635,0.396 3.031,0.552 0.396,0.156 10 false ST 0.063,0.063 0.26,0.229 0.198,0.167 10 false *a
*a Component without harness connected
(Transmission Wire)


Disconnect the transmission wire connector from the transaxle.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
2 (ST) - Body ground 20°C (68°F) 11 to 15 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

NG

3.INSPECT SHIFT SOLENOID VALVE ST
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
a.
C228647C30
2.677,0.823 3.063,1.073 0.385,0.25 1.677,2.625 1.906,1.948 false 0.177,0.167 0.49,0.323 0.313,0.156 10 false *a 2.75,0.854 3.073,1.073 0.323,0.219 10 false B56 1.594,2.656 1.927,2.865 0.333,0.208 10 false ST
*a Front view of wire harness connector
(to ECM)


Connect the transmission wire connector to the transaxle.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for short):
Tester Connection Condition Specified Condition
B56-80 (ST) - Body ground 20°C (68°F) 11 to 15 Ω



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>ECM>COMPONENTS


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.INSPECT SHIFT SOLENOID VALVE ST
a.
C117937C01
0.885,2.729 1.135,2.99 0.25,0.26 10 false (-) 0.073,0.021 1.688,0.208 1.615,0.188 10 false *a 1.531,2.74 1.781,3 0.25,0.26 10 false (+)
*a Component without harness connected
(Shift Solenoid Valve ST)


Remove the shift solenoid valve ST.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
Solenoid Connector (ST) - Solenoid Body (ST) 20°C (68°F) 11 to 15 Ω



c.

Connect the positive (+) lead to the terminal of the solenoid connector and the negative (-) lead to the solenoid body to check the solenoid valve operation.

OK:

The solenoid makes operating sounds.



Result:
Proceed to
OK
NG



OK

REPLACE TRANSMISSION WIRE

Click hereDrivetrain>U441E AUTOMATIC TRANSMISSION / TRANSAXLE>TRANSMISSION WIRE>COMPONENTS


NG

REPLACE SHIFT SOLENOID VALVE ST

Click hereDrivetrain>U441E AUTOMATIC TRANSMISSION / TRANSAXLE>VALVE BODY ASSEMBLY>COMPONENTS