Theft Deterrent System - Overview Codes 46/53
90pontiac11Bulletin Number: 90-8-21
Reference Number: 038119
Publish Date: 5/90
Subject: SERVICE MANUAL UPDATE - SECTION 8A - THEFT DETERRENT SYSTEM PASS KEY DIAGNOSIS (OVERVIEW CODES 46/53)
Models
Affected: 1989-90 FIREBIRD MODELS W/5.0, 5.7, 3.1
SERVICE MANUAL UPDATE
APPLICATION: 1989 Firebird models with the following engine options: 5.0 LB9 V-8 Vin Code F
5.7 L98 V-8 Vin Code 8
5.0 L03 V-8 Vin Code E
1990 Firebird models with the following engine
options: 5.0 LB9 V-8 Vin Code F
5.7 L98 V-8 Vin Code 8
5.0 L03 V-8 Vin Code E
3.1 LHO V-6 Vin Code T
Overview of Pass Key Theft Deterrent System Diagnostic Codes 46/53:
The ECM will not pulse the injectors "On" and thus allow the vehicle to be started unless it receives the proper signal from the Pass Key decoder module. Failure of the proper signal to reach the ECM may be reported as a Code 46 on some PFI engines or as a Code 53 on some TBI engines. Not all engines will set a code when the proper signal fails to reach the ECM.
Diagnostic Procedures:
The following table defines where codes 46 or 53 will or will not be set, and the proper procedures for diagnosis of the Pass Key Theft Deterrent System.