E047

BCM-ECM Data Circuit:

DESCRIPTION:

This diagnostic test monitors the BCM to PCM/ECM serial data for a problem. Code E47 indicates that the PCM/ECM has lost BCM data. PCM/ECM diagnostics cannot be accessed when code E47 is set because the UART serial data communications between PCM/ECM and BCM are not working. To diagnose code E47 use BCM code chart F32.

NOTE: A faulty ignition switch can cause a false code E47 to be set. This will be caused by the switch powering the PCM/ECM before it powers the BCM. Code E47 and F32 can be stored together.

TEST CONDITIONS:

1. Code E12 not set.
2. Engine speed greater than 500 RPM for 5 seconds.

FAILURE CONDITIONS:

Interrupt in serial data "IN."

ACTION TAKEN:

1. PCM/ECM turns on "SERVICE ENGINE SOON" telltale.