Neon L4-2.0L DOHC (1996)
Powertrain Control Module: Customer Interest
PCM - MIL ON/DTC's 84, 81, 27/9D Set
NO: 18-06-96
GROUP: Vehicle Performance
DATE: Feb. 23, 1996
SUBJECT:
Malfunction Indicator Light illuminated For Erroneous Hex DTC's 84, 81, 27 And/Or 9D
MODELS:
1996 (PL) Neon
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE 2.0L SOHC AND DOHC ENGINES (AUTOMATIC AND MANUAL
TRANSAXLE) BUILT PRIOR TO NOVEMBER 14, 1995 (MDH 11-14-XX) IN THE BELVEDERE ASSEMBLY PLANT (D IN THE 11TH
POSITION OF THE VIN) AND NOVEMBER 17, 1995 (MDH 11-17-XX) IN THE TOLUCA ASSEMBLY PLANT (T IN THE 11TH POSITION
OF THE VIN).
SYMPTOM/CONDITION:
The Malfunction Indicator Light (MIL) will be illuminated and the following hex codes (DTC's) may be erroneously set:
^
84 - TPS voltage does not agree with MAP.
^
81 - Downstream 02 sensor stays at center.
^
27 - No change in MAP from start to run.
^
9D - Intermittent loss of cam or crank position.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBIII) and appropriate Diagnostic Procedure Manual, verify that all engine systems are
functioning correctly. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair as necessary.
If one of the above fault codes are set, verify proper operation as follows:
^
84 - With key on and engine off, TPS voltage should increase smoothly from less than 1.0 volt at idle to greater than 3.0 volts at WOT.
^
81 - Rear O2 signal - With the engine warmed up, verify that the rear O2 sensor voltage will read outside the .35 to .65 volt range during a road test,
especially during hard deceleration and WOT.
^
27 - MAP - With key on, check BARO; then start vehicle, verify that vacuum is greater than 4 inches of vacuum.
^
9D - Cam & Crank - Verify cam and crank are in sync using the DRB III.
If the above proper operation is not verified, proceed with the appropriate diagnosis and repair as stated in the Powertrain Diagnostic Procedures Manual
prior to performing the software reflash contained in this bulletin. If the above proper operation is verified, proceed with the repair procedure.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7000
J1962 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 19 OR HIGHER AND TIL CD RELEASE 1099 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This bulletin involves reprogramming (flashing) the PCM with new software (calibrations).
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.
