New Air Flow Sensor - Less Sensitive To Dirt (GROUP 2, NO. 1/00)
Publication date: 2000-04-18Reference number: GROUP 2, NO. 1/00
NEW AIR FLOW SENSOR - LESS SENSITIVE TO DIRT
TECHNICAL SERVICE BULLETIN
AIR FLOW SENSOR
Model(s): 2000-on Porsche Boxster 2.7, Boxster S
Group: 2 - Fuel, Engine Electronics, Exhaust
Bulletin No.: 1/00
Part Identifier: 2445
Date: April 18, 2000
CONCERN
New airflow sensor (HMF) that is less sensitive to dirt particles.
INFORMATION
As of January 31, 2000, a new HMF is being introduced. The new HMF, which is less sensitive to dirt particles, is being installed in production starting with the following VIN numbers:
- Boxster: 98 6YS 62 0415 - 2.7 liter
- Boxster: 98 OYU 62 5100 - 2.7 liter
- Boxster S: 98 OYS 66 0258 - 3.2 liter
- Boxster S: 98 3YU 66 2414 - 3.2 liter
A barcode sticker will be attached to the air cleaner housing to make it easier to distinguish whether a new or an old HMF is installed in the engine. When replacing an old sensor, the DME will have to be reprogrammed. This is accomplished by using the PST2 with version 9.0 installed. Version 9.0 has a tentative release date of May 1, 2000. Please note that until software version 9.0 is released; continue to use the old style HMF sensor for repairs.
The barcode sticker reads as follows:
| Number | Description |
|---|---|
| 996 110 021 09 | Old style HMF |
| 996 110 021 10 | New style HMF |
The sensors are visually distinguished two ways:
- There are coded pegs by the electrical plug connection. One peg (A) indicates the old style and two pegs (N) indicates the new style (see Fig 1 ).
- The air sampling port is manufactured differently. A straight bottom (A) indicates the old style and curved bottom (N) indicates the new style (see Fig 2 ).
PARTS INFORMATION
| Part Number | Description |
|---|---|
| 996 606 124 00 | Old style HMF (2.7 and 3.2) |
| 986 606 125 00 | New style HMF (2.7 and 3.2) |
WORK PROCEDURE
When replacing an old style HMF sensor on vehicles with a new style HMF sensor, you have to reprogram the DME. Remember; do not install a new style HMF sensor until you receive the 9.0 software for the PST2.
PROGRAMMING THE DME CONTROL UNIT WITH PST2 AFTER INSTALLING A NEW STYLE HMF
- Connect the PST2 and switch on ignition.
- Select vehicle type and start search with the >> key.
- Select DME in the control modules menu and press the >> key.
- Select control unit programming and press the >> key.
- Select program map and press the >> key.
- Input the VIN number, press the >> key and confirm with the F7 key.
- Input the old programming number and press the >> key. This is the number obtained from IPAS. Confirm the number with the F7 key.
- Select the proper data record corresponding with New HMF. Example: "Boxster S OBD II (LEV, manual transmission), New HMF". Press the >> key to start programming.NOTE: LEV stands for Low Emission Vehicle.
- When programming is complete, a message will be displayed "After control unit programming, the "CAN timeout" fault must be erased on every control unit connected with the CAN". Press the >> key to continue.
- Select the DME and clear fault memory. If the vehicle has a tiptronic, the fault memory also needs to be cleared.
- Return to the start menu and switch off PST2.
WORKING TIME
| Labor Operation | Time Units | Description |
|---|---|---|
| 24 45 19 12 | 60 TU | Removing and installing HMF. Includes: Re-programming the DME with the PST2. |
| 24 45 19 15 | 90 TU | Removing and installing HMF (vehicle with hardtop) Includes: Re-programming the DME with the PST2. Removing and installing hardtop. |
LITERATURE
Boxster Technical Manual, Group 2:
- 70 - Programming the DME control unit.
- 45 19 - Removing and installing mass airflow sensor.