DTC 46

Code 46 Chart:

Code 46 Wiring Diagram:

CIRCUIT DESCRIPTION:

The VATS system is designed to disable vehicle operation if the incorrect key or starting procedure is used. The VATS decoder module sends a signal to the ECM if the correct key is being used. If the proper signal does not reach the ECM on CKT 229, the ECM will not pulse the injectors "ON" and thus not allow the vehicle to be started.


NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to SCHEMATIC DIAGRAMS/ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS/ECM CONNECTOR IDENTIFICATION for correct color code identification of circuit.


TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. If the engine cranks, but doesn't start, it indicates that the portion of the module which generates the signal to the ECM is not operating or CKT 229 is open or shorted to ground. It is more likely that the decoder is at fault than then ECM.

2. If a code 46 is stored and the engine will not crank, it indicates that there is a VATS problem or an incorrect key or starting procedure is being used.

DIAGNOSTIC AIDS:

- The fuse for the VATS system is the ECM/IGN fuse.