Engine-Codes - Toyota - P1790 2002 Toyota Echo

P1790 2002 Toyota Echo Code - ST Solenoid Valve Circuit Malfunction

- Code Popularity: 2,579 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1790 2002 Toyota Echo?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Open or short in shift solenoid valve ST circuit
  • Shift solenoid valve ST
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How to Fix the DTC P1790 2002 Toyota Echo?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1790 2002 Toyota Echo code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

ECU memorizes DTC P1790 if (a) or (b) condition below is detected once or more, but ECU does not start MIL blinking.(a)Solenoid resistance is 30 W or lower (short circuit) when solenoid energized.(b) Solenoid resistance is 100 kW or higher (open circuit) when solenoid is not energized.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1790 2002 Toyota Echo Code Mean?

Shift solenoid valve ST is switched ON-OFF by a signal from ECM so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when letting in or out reverse clutch. f it is broken, the shift shock becomes big.

P1790 2002 Toyota Echo Code - ST Solenoid Valve Circuit Malfunction

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