Diagnostic Aids

The HVAC fuse also runs the A/C compressor clutch and relay. If TCC power circuit and PCM input circuit are okay but the fuse blows, check the A/C clutch circuit. Ensure TCC brake switch is adjusted properly. If code resets after all checks and repairs have been performed, problem may be transaxle internal hydraulic or mechanical.

Fig 1: Code 39 Schematic (4.0L) TCC Not Engaging

Fig 2: Code 39 Diagnostic Flow Chart - 1 Of 2 (4.0L) TCC Not Engaging

Fig 3: Code 39 Diagnostic Flow Chart - 2 Of 2 (4.0L) TCC Not Engaging