Neon L4-2.0L SOHC (1995)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PCM - Ticking Noise from Engine Compartment
NO: 18-39-95
GROUP: Vehicle Performance
DATE: Dec. 8, 1995
SUBJECT:
"Ticking" Noise from Engine Compartment
MODELS:
1995 (PL) Neon
NOTE:
This bulletin does not apply to vehicles that have had the Powertrain Control Module reprogrammed on TSB 18-36-95,18-20-95 Rev. A, or 18-38-95
dated December 08, 1995.
SYMPTOM/CONDITION:
Customer complaint of a "ticking" noise at idle from engine compartment. Condition is more noticeable in cold ambient under 40°F.
DIAGNOSIS:
Disconnect the electrical connector from the Duty Cycle Evap Purge Solenoid, located over the right front engine mount. If the noise goes away, proceed
to the Repair Procedure. If a "ticking" noise is still evident, further diagnosis and repair will be necessary which will not be covered in the bulletin.
Before continuing, Diagnostic Trouble Code (DTC) "EVAP PURGE SOLENOID CIRCUIT" will have been set and will have to be erased from
memory.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7015
Engine Cable
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 18 or higher and TIL CD
release 1095 or higher must be installed.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibrations) which disables the
Duty Cycle Evap Purge Solenoid at idle when the ambient temperature is less than 0°F, and delays solenoid operation at idle for 30 minutes when the
ambient temperature is between 0°F. and 40°F.
1.
Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle and power them up.
2.
Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRB III 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 DRB III which will allow the DRB III to obtain the current part number of the PCM.
7.
The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin
programming.
^
If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the
part number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then another
condition exists that will require further diagnosis and repair.
8.
The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
NOTE:
The following steps are required by law.