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.MONITOR STRATEGY
Related DTCs | P0787: Shift timing solenoid/Range check P0788: Shift timing solenoid/Range check |
Required sensors/Components | Shift solenoid valve ST |
Frequency of operation | Continuous |
Duration | 0.128 seconds |
MIL operation | Immediate |
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
The monitor runs whenever the following DTCs are not present | None |
Solenoid | ON |
Time after solenoid OFF to ON | 0.008 seconds or more |
Battery voltage | 8 V or more |
Ignition switch | ON |
Starter | OFF |
The monitor runs whenever the following DTCs are not present | None |
Solenoid | OFF |
Time after solenoid ON to OFF | 0.008 seconds or more |
Battery voltage | 8 V or more |
Ignition switch | ON |
Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
Shift solenoid valve ST resistance | 8 Ω or less |
Shift solenoid valve ST resistance | 100 kΩ or more |
COMPONENT OPERATING RANGE
Shift solenoid valve ST resistance | 11 to 15 Ω at 20°C (68°F) |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (Click here).
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE ST) |
Disconnect the C68 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 C68 transmission wire 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 C51-71 (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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