Powertrain Controls - ECM/PCM

Diagnostic Trouble Code 46:

DTC 46 Circuit:

CIRCUIT DESCRIPTION
The PASS-Key-II system is designed to disable vehicle operation if the incorrect key or starting procedure is used. The theft deterrent module 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 is measured using the DC scale on the digital voltmeter

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 1.7 seconds.

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


CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) 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
If the engine starts and then stalls, it indicates that the portion of the theft deterrent module, which generates the signal to the PCM is not operating or CKT 229 is open or shorted to ground. If theft deterrent module is found to be OK, the PCM may be at fault, but this is not a likely condition.