Trouble Code 4 (Program Switch)
PROGRAM SWITCHExplanation
This defect code is stored when, at the same time, two or three of the wires to the control unit Pins 4, 14, 15 (S-E-M) are applied to ground. As a result, no program switchovers are possible.
Effect of defect
The E-program is set by the control unit.
Possible cause
Wires from the program switch to the Electronic Transmission Control (EGS) control unit or to the instrument cluster defective, or program switch defective.
NOTE: Observe display in instrument cluster during troubleshooting.
Troubleshooting
As displayed by scan tool instructions.