BCM - Codes E047, B333,B334,B335,B336/B337-New Diagnosis: Overview
NUMBER: 92-T-141ACORP.REF.NO: 018112R
DATE: February 1993
SECTION: 6E3, 8A, 8D2
SUBJECT:
CODES E047, B333, B334, B335, B336, AND/OR B337 - NEW DIAGNOSIS PROCEDURE
MODEL/YEARS:
1986-92 TORONADO/TROFEO
This bulletin cancels and supersedes Dealer Technical Bulletins 90-T-195 and 92-T-141 which should be discarded.
Some 1986-92 Toronado/Trofeo models, may exhibit intermittent setting of data line codes E047, B333, B334, B335, B336, and/or B337. These may all be set at one time or in any combination. Single codes should be diagnosed using the appropriate trouble tree in the Toronado/Trofeo Service Manual. In addition to the codes, some of the following may also occur:
^ IPC, CRT, and/or the HVAC/ECC flashes on and off or bright/dim
^ Trip odometer resets to zero (0)
^ ECC switches to full heat at high blower speed out the front defrost ducts
^ Erroneous displays appear on the IPC or ECC
^ ECC panel will not respond to pressing of buttons
^ CRT, DIC, or ECC may display SYSTEM PROBLEM
These conditions may be caused by either a damaged data line circuit or one of the components connected to the data line. When operating normally, the serial data line voltage should continually fluctuate from 0 to 5 volts.
DIAGNOSIS:
If the serial data line has been shorted to ground, the voltage at the Assembly Line Data Link (ALDL) will be 0 V. If it has been shorted to voltage, it will be over 5 V. If one of the components on the serial data line is affecting the data line voltage, the serial data voltage at the ALDL connector will be a steady value anywhere between .1 and 5 volts (e.g., 2.7V, 4.8V, etc.).