Neon L4-2.0L SOHC (1995)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
MIL ON, O2 Sensor DTC's Set
NO: 14-06-94 Rev. B
GROUP: Fuel
DATE: May 20, 1994
SUBJECT:
Check Engine Light On, Code 21, Up or Downstream 02S Shorted to Voltage
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 14-06-94 REV. A, DATED MAY 6, 1994 WHICH SHOULD BE REMOVED
FROM YOUR FILES. THIS BULLETIN PROVIDES FOR REPROGRAMMING THE POWERTRAIN CONTROL MODULE RATHER THAN
REPLACING THE MODULE. THE LABOR OPERATION NO. AND TIME HAVE BEEN REVISED TO REFLECT THIS CHANGE, AND
INCORRECT OHS REFERENCES ARE CHANGED TO 02S.
MODELS:
1995 (PL) Neon
NOTE:
THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO APRIL 5, 1994 (MDH 04-05-XX).
SYMPTOM/CONDITION:
The "Check Engine" light illuminates with flash code # 21, or Diagnostic Trouble Code "Upstream 02S Shorted To Voltage or Downstream 02S Shorted
To Voltage" is set.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB III) with the appropriate Diagnostic Procedure Manual, verify that all engine
systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference. If codes
other than "Upstream or Downstream 02S Shorted to Voltage" are present, repair as necessary. If the "Upstream or Downstream 02S Shorted To
Voltage" is present and all other systems are functioning correctly, proceed with the following repair.
**EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
4669020
Label - Authorized Software Update
1
4275086
Label - Authorized Modification
NOTE:
THE MOPAR DIAGNOSTIC SYSTEM IS REQUIRED TO PERFORM THE FOLLOWING REPAIR AND THE SYSTEM MUST BE
OPERATING WITH RELEASE 13 OR HIGHER.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming the powertrain control module with new software (calibrations).
1.
Connect the MDS (Mopar Diagnostic System) and DRBIII (Scan Tool) to the vehicle and power them up.
2.
Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRBIII MAIN MENU Screen.
3.
Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4.
Use the arrow keys and select CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5.
Use the arrow keys and select PROGRAM CONTROLLER PART on the MDS, then press NEXT MENU.
6.
Follow the steps presented on the MDS and DRBIII which will allow the DRBIII to obtain the current part number of the controller.
7.
The MDS will display the part number of the controller on the vehicle and the appropriate replacement part number, then press NEXT MENU to
begin programming.
