Home ReviewsRefund
Home/Chevrolet/Suburban C2500/Chevrolet Suburban C2500 (1992-1999)/Repair manual/Automatic Trans/Automatic Transmission Diagnosis - 4L80-E: Specifications
Contents Wiring diagrams Section: Automatic Trans All sections

Automatic Transmission Diagnosis - 4L80-E: Specifications Chevrolet Suburban C2500

Automatic Trans ~131 words

DTC 69, TORQUE CONVERTER CLUTCH STUCK ON

PCM commands TCC PWM solenoid on by modulating TCC signal fluid acting on converter clutch shift valve. Then TCC apply fluid applies torque converter clutch.

DTC 69 will set when

  1. DTCs 21, 22 , 28, 71 or 74 are not set.
  2. TCC slip speed indicates -5 to 10 RPM.
  3. TCC solenoid is commanded off.
  4. TP sensor signal is more than 25 percent.
  5. Trans. range switch indicates D3 or D4.
  6. Commanded gear indicates 2nd or 3rd gear.
  7. All conditions are met for 2 seconds. NOTE: Test numbers refer to numbers on diagnostic chart. This test checks for proper throttle position sensor operation. This test checks mechanical state of TCC. When PCM commands TCC solenoid off, TCC slip should increase.

More articles — Automatic Transmission Diagnosis - 4L80-E