K 3500 Truck 4WD V8-393 6.5L DSL Turbo (1993)
2-3 Shift Solenoid Circuit
CIRCUIT DESCRIPTION
The 2-3 shift solenoid is attached to the valve body and is a normally open exhaust valve used to determine the transmission gear. The 2-3 shift
solenoid is "ON" in third and fourth gears, and "OFF" in first and second gears.
Fused ignition is supplied to the 2-3 shift solenoid. The PCM/TCM will engage the 2-3 shift solenoid by grounding CKT 1223 to energize the 2-3
shift solenoid. The 2-3 shift solenoid is usually green in color.
TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks the 2-3 shift solenoid and the internal transmission wiring for shorts.
2. This test checks for power to the shift solenoids from the ignition through the fuse.
3. This test checks that CKT 1223 is not shorted to ground.
4. This test checks the ability of the PCM/TCM to ground or control the 2-3 shift solenoid.
5. This test checks that CKT 1223 is not shorted to ground.
DIAGNOSTIC AIDS
Check all connections at the transmission pass-thru connector. Refer to "PCM/TCM Intermittent DTC(s) or Performance."
