Powertrain Controls - ECM/PCM

Diagnostic Trouble Code 46:

PASS Key II Circuit:

CIRCUIT DESCRIPTION
The PASS-Key II system is designed to disable vehicle operation if the incorrect key or starting procedure is used. The Central Control Module (CCM) sends a signal to the Engine Control Module (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.

Diagnostic Trouble Code (DTC) 46 will set, if the proper signal is not being received on CKT 229 by the ECM when the ignition is turned "ON." A PASS-Key II fault will store a DTC 46 in the ECM memory.

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 Central Control Module (CCM) which generates the signal to the ECM is not operating or CKT 229 is open or shorted to ground. If the CCM is found to be OK, as determined from SECTION 8A and 9D the ECM may be at fault, but this is not a likely condition.

2. If DTC 46 is stored, and the engine will not crank, it indicates that there is a PASS-Key II problem or an incorrect key or starting procedure is being used.