Powertrain Controls - ECM/PCM

DTC 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) 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.

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
Numbers below refer to circled numbers on the diagnostic chart.

1. 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. If CCM is found to be OK, the PCM 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.

DIAGNOSTIC AIDS
If the proper signal is not received on CKT 229 by the PCM, the engine will start then stall. The proper signal is between 40-60 Hz and must be measured using the AC voltage scale on the Digital Volt Meter (DVM)
.