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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Electronic Component Description >> 1-2 and 2-3 Shift Solenoid Valves

1-2 and 2-3 Shift Solenoid Valves

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View of Shift Solenoid Valve
GM20662Courtesy of GENERAL MOTORS CORP.

A shift solenoid valve is a two-port, feed-bleed device consisting of a coil/plunger-ball assembly. The solenoid assembly works with an orifice to pressurize the shift valve end chamber when voltage is applied to its coil. The controlled pressure then moves the shift valve against a spring causing a shift to occur. When voltage is no longer applied, the chamber opens to exhaust and the opposite shift valve action occurs. Shift solenoids eliminate the need for TV and governor pressures to control shift valve operation.

The 4T80-E transmission uses two shift solenoid valves: the 1-2 and 2-3, which are attached to the lower valve body.

IMPORTANT: If both solenoids lose power, only Second gear will result.

Shift solenoid resistance should measure 19-24 ohms when measured at 20°C (68°F). Resistance should measure 24-31 ohms when measured at 100°C (212°F). Shift solenoid current flow should not exceed 0.75 amps. The shift solenoid valve should energize at a voltage of 7.5 volts or more, measured across the terminals. The shift solenoid valve should de-energize when voltage is one volt or less.

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