DTC 46

*** UPDATED BY TSB 416516, DATED AUGUST, 1994

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 theft deterrent module/Central Control Module (CCM) enables the crank circuit to the starter and sends a signal to the PCM if the correct key is being used If the proper signal does not reach the PCM on CKT 229, the Powertrain Control Module (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 CKT 229 is between 40-60 Hz and is measured using the DC scale on the Digital Volt Ohm Meter (DVOM).

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

DTC 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/CCM, which generates the signal to the PCM is not operating or CKT 229 is open or shorted to ground. If theft deterrent module/CCM is found to be OK, the PCM may be at fault, but this is not a likely condition.

The lock cylinder is bypassed to ground on Special Equipment Option (SEO) vehicles, so the ignition key with the resistor pellet is not needed.