HOLDEN GEN III V8, Обучение по обслуживанию

Страница: 81 / 113

GEN III V8 ENGINE MANAGEMENT
THEFT DETERRENT INPUT
When the ignition switch is turned from off to on, the BCM will transmit security information to the PIM via the
DART serial data bus, circuit 1 2 2 1 . The PIM compares the received security information with it's stored security
information and if the information matches, the PIM will enable the starter relay, and supply security information
(password) via Class II Serial Data to the PCM. If this password matches the password stored in the PCM, the
system enables the fuel injection. The PCM will return an OK to start message to the BCM via the PIM, which
tells the BCM to switch from short loop mode to the long loop mode. If the PIM does not send a password or if
the PCM does not receive it, the vehicle will not start unless the PCM is in Vehicle Theft Deterrent (VTD) Fail-
Enable mode. The BCM will only transmit the correct security information to the PIM if the BCM has been
disarmed via the remote coded key. If the BCM, PIM or PCM lose communications with each other after the
system has received the correct password, the PCM goes into VTD Fail-Enable mode. This allows the driver to
restart the vehicle on future ignition cycles until communications between the BCM, PIM or PCM are restored. If
the BCM, PIM or PCM lose communications before the PCM receives the BCM password, the PCM disables the
fuel injection until communication is restored. In both cases DTC P1626 sets. The PCM will not disable the fuel
injection once the PCM enables the fuel within a given ignition cycle in order to prevent stalling as a result of
theft deterrent system faults.
Page - 76 GEN III V8 ENGINE MANAGEMENT