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). |
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P0788 | ECM detects open in solenoid valve ST circuit 4 times when solenoid valve ST is not operated (1-trip detection logic). |
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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
INSPECTION PROCEDURE
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE ST) |
Disconnect the transmission wire connector from the transaxle.
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)
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OK | |
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Connect the transmission connector to the transaxle.
Disconnect the ECM connector.
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)
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OK | ||
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3.INSPECT SHIFT SOLENOID VALVE ST |
Remove shift solenoid valve ST.
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
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)
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OK | ||
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