Diagnostic Aids

1995 Chevrolet Sportvan G20, 6.5 PSECTION Diagnostic Aids
WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.

Check all connections to transaxle pass-through connector. An open in ignition feed circuit will cause multiple codes to set. If scan tester indicates TCC is working, road test vehicle. If engine RPM does not decrease when TCC engagement is indicated on TCC, diagnose transaxle for possible mechanical problem.

SOLENOID TEMPERATURE-TO-RESISTANCE VALUES

Solenoid Temp. FΒ° (CΒ°) Ohms
Shift A & B 68 (20) 20-30
Shift A & B 190 (88) 23-50
TCC Apply 68 (20) 20-30
TCC Apply 190 (88) 23-50
TCC PWM 68 (20) 10-15
TCC PWM 190 (88) 11-25
Fig 1: Code P0740 Schematic (3.8L FWD Van) TCC Circuit
G95A28100
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.