DTC    P0787    Shift / Timing Solenoid Low (Shift Solenoid Valve ST)

DTC    P0788    Shift / Timing Solenoid High (Shift Solenoid Valve ST)


DESCRIPTION

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.
DTC Detection Condition
Trouble Area
P0787
ECM detects short in solenoid valve ST circuit 4 times when solenoid valve ST is operated (1-trip detection logic).
  1. Wire harness or connector
  2. Transmission wire
  3. Shift solenoid valve ST
  4. ECM
P0788
ECM detects open in solenoid valve ST circuit 4 times when solenoid valve ST is not operated (1-trip detection logic).
  1. Wire harness or connector
  2. Transmission wire
  3. Shift solenoid valve ST
  4. ECM

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


C161971E38


INSPECTION PROCEDURE

1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE ST)
C229166E13

  1. Disconnect the transmission wire connector from the transaxle.

  1. 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
    Text in Illustration 
    *a
    		Component without harness connected
    (Transmission Wire)


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
C229165E20

  1. Connect the transmission connector to the transaxle.

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C20-80 (ST) - Body ground
    		20°C (68°F)
    		11 to 15 Ω
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)  

3.INSPECT SHIFT SOLENOID VALVE ST
D009034E14

  1. Remove shift solenoid valve ST.

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

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

  1. 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.
    Text in Illustration 
    *a
    		Component without harness connected
    (Shift Solenoid Valve ST)


NG
REPLACE SHIFT SOLENOID VALVE ST (Click here)
OK

REPAIR OR REPLACE TRANSMISSION WIRE (Click here)