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Home >> GMC >> 1993 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Transmission >> Component Check Charts (4L60-E) >> 2-3 Shift Solenoid Circuit Check >> Notes

2-3 Shift Solenoid Circuit Check: Notes

Shift solenoids are used inside valve body to control spool valves and determine transmission gear. The 2-3 shift solenoid is on in 1st and 2nd gears, and off in 3rd and 4th gears. Fused battery ignition voltage is supplied to 2-3 shift solenoid. PCM engages solenoid by grounding circuit No. 1223.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This test checks 2-3 shift solenoid and internal transmission wiring for short circuits.
  2. This test checks for power, from the ignition through the fuse, to the shift solenoid.
  3. This test ensures circuit No. 1223 is not shorted to ground.
  4. This test checks ability of PCM to ground or control 2-3 shift solenoid. If bidirectional scan tester is not available, solenoid may be activated by grounding ALDL test terminal "B" with ignition on and engine off.
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