Diagnostic Aids

A Code 39 in conjunction with a Code 38 would mean a problem with one or more of following components:

• Fuse or power circuit, brake switch or wire before splice.

Code 39 alone indicates a problem at:

• Brake input circuit between splice and TCC solenoid.
• TCC drive circuit between TCC solenoid and ECM.
• Poor connection to ECM or ECM itself.

Fig 1: Code 39, Using Tech 1, W/4T60 Transaxle, TCC Ckt, Schematic