Powertrain Controls - ECM/PCM

Diagnostic Trouble Code (DTC) 46:

PASS-Key II Circuit:

CIRCUIT DESCRIPTION
The Personal Automotive Security System (PASS)-Key II system is designed to disable vehicle operation if the incorrect key or starting procedure is used. The Central Control Module (CCM) enables the crank circuit to the starter and sends a signal to the Powertrain Control Module (PCM) if the correct key is being used. If the proper signal does not reach the PCM on CKT 229, the PCM will not pulse the injectors "ON" and thus not allow the vehicle to continue to run, even if the crank circuit is bypassed. The proper signal is between 40-60 Hz and must be measured using the DC scale on the Digital Volt Meter (DVM).

DIAGNOSTIC TROUBLE CODE (DTC) 46 WILL SET WHEN
DTC 46 will set and the engine will stall if the proper signal is not being received on CKT 229 by the PCM after 3 seconds.

ACTION TAKEN (PCM DEFAULT)
DTC 46 will be stored in the PCM memory but will not turn "ON" the Malfunction Indicator Lamp (MIL).

DTC CHART TEST DESCRIPTION
Number below refers to circled number on the diagnostic chart.

1. 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.

DIAGNOSTIC AIDS
Engine Starts Then Stalls
If the engine starts and then stalls, it indicates that the portion of the CCM, which generates the signal to the PCM, is not operating or CKT 229 is open or shorted to ground.

Checking the CCM
The CCM can be checked by identifying the appropriate circuits with the electrical diagrams or checking for CCM diagnostic trouble codes. Direction on accessing CCM diagnostic trouble codes may be found in Computer and Control Systems/System Diagnosis/Procedures/Vehicle On-Board Diagnostics/Diagnostic Modes. Diagnostic Modes

PCM Faults
The PCM may be at fault, but this is not a likely condition.