3.3L & 3.8L Cold Engine Knock:Pcm RECALIBRATION (09-13-93)

Publication date: 1993-10-22
Reference number: 09-13-93

3.3L & 3.8L COLD ENGINE KNOCK:PCM RECALIBRATION

TECHNICAL SERVICE BULLETIN

Reference Number(s): 09-13-93, Date of Issue: October 22, 1993

3.3L AND 3.8L COLD ENGINE KNOCK

Model: 1992-1993 Dynasty/New Yorker/New Yorker Salon (AC); Caravan/Grand Caravan/Caravan C/V (AS); Voyager/Grand Voyager/Town & Country (AS); Imperial/New Yorker Fifth Avenue (AY);

Group: Engine

Bulletin No.: 09-13-93

Date: October 22, 1993

NOTE: This bulletin applies to vehicles equipped with 3.3L or 3.8L engine and the 41TE transaxle.

NOTE: If Technical Service Bulletin No. 18-12-93 has been applied to the vehicle, the repair for cold engine knock is already installed.

SYMPTOM/CONDITION:

Light engine knocking noise during light acceleration or neutral rev.-up following a cold start up. Condition more prevalent in lower ambient temperatures and after a 5 to 6 hour soak.

DIAGNOSIS:

Using the Scan tool (DRB II) and appropriate diagnostic procedure or the Mopar Diagnostic System, verify that all vehicle engine systems are functioning as designed. If Trouble Codes (Diagnostic Trouble Codes) are present, record them on the repair order for future reference, and repair as necessary. If no codes are present and all systems are functioning correctly, proceed with the following repair.

PCM (Powertrain Control Module) RE-PROGRAMMING

This repair involves selectively erasing and programming the Powertrain Control Module with new software (calibrations).

EQUIPMENT/PARTS REQUIRED

Qty.	Equipment/Part Description	Part Number
1	Scan tool (DRBII)	CH1000
1	Standard Engine Diagnostic Cable	CC2000
1	Flash Programming Adapter	CH1500
1	Authorized Software Update Label	4669020
1	Authorized Modification Label	4275086

MULTI-PART NUMBER FLASH RE-PROGRAMMING INSTRUCTIONS

Insert the Flash Programming Cartridge into the DRB-II.
Connect the DRB-II to the Flash Programming Adapter.
Connect the Flash Programming Adapter to the Engine 6-Way Cable.
Connect the Engine 6-Way Cable to the Engine Diagnostic Connector.
Connect the Engine 6-Way Cable Red Battery Clip to the Positive Terminal of the Vehicle Battery.
Turn the vehicle ignition on.
The DRB-II will power up and prompt through the sequence of windows shown below:

Fig 1: Identifying DRB-II Prompt Sequence
When the update is complete, turn the vehicle ignition off.
NOTE: If an error happens, write down the error message (off the Scan tool screen). Then press MODE and ATM keys together on the Scan tool to retry (reboot). The under hood temperature during programming must be between -40°F (40°C) and +185°F (+85°C).
NOTE: THIS STEP IS REQUIRED BY LAW. Type the necessary information on the "Authorized Software Update Label" shown in Fig. 1 and attach to the PCM.

Fig 2: Authorized Software Update Label
Type the necessary information on the Authorized Modification Label shown in Fig. Fig 3 . and attach the label near the VECI Label.

Fig 3: Authorized Modification Label

1992 Federal Emission Vehicles only - EFFECTIVE DATE: 12-93

The 1992 AC, AS, & AY Models (with FEDERAL EMISSIONS) do not have "Flash" capacity in the PCM. Therefore, these vehicles will require the replacement of the Powertrain Control Module with one that has revised software.

PARTS REQUIRED

Qty.	Part Description	Part Number
1	Powertrain Control Module	---
---	AC, AY 3.3L Federal	4762726
---	AS 3.3L Federal	4762734
---	AY 3.8L Federal	4762740
1	Authorized Modification Label	4275086

REPAIR PROCEDURE:

This repair involves the replacement of the Powertrain Control Module with a module that has revised software.

With the ignition switch in the OFF position, disconnect the battery.
Remove the PCM and replace it with a unit called out in PARTS REQUIRED.
Connect the battery.
Type the required information on the Authorized Modification Label as shown in Fig. Fig 3 and attach near the VECI Label.