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GEN III V8 ENGINE MANAGEMENT

SERVICE PROGRAMMING SYSTEM

The Gen III PCM does not contain a removable FROM, it uses an EEPROM (Flash Memory) which is non

removable. The PCM is programmed from the factory with the proper calibrations for vehicle operation. In the
event that the PCM is replaced, or an updated calibration is required to correct a vehicle's operating condition,

the new PCM or the new calibration will have to be down loaded to the PCM EEPROM (Flash Memory). Down

loading is accomplished through the vehicle DLC using the TECH 2 Service Programming System (SPS) and
the Technical Information System (TIS).

The service replacement PCM EEPROM (Flash Memory) will not be programmed. DTC P0601 and P0602

indicates the Flash Memory is not programmed or has malfunctioned.

Conditions for setting DTC P0601

• The PCM is unable to correctly read data from the EEPROM (Flash Memory)

Conditions for setting DTC P0602

• No software data is present in the ECU

The SPS procedure has to be performed as follows:

• Connect TECH 2 to DLC, turn TECH 2 on, at the TECH 2 title screen press ENTER and select the following:
• F1: Service Programming System (SPS).
• FO: Request Info (FO: Request Info will be flashing).
• (X)1999.
• WH Statesman or Caprice.

• Then follow TECH 2 screen instructions.
• Turn off ignition and disconnect TECH 2 from the vehicle.
• Using the RS232 connector lead, Hardware Key and TECH 2 power lead, connect TECH 2 to a Personal

Computer (PC) with TIS 2000 installed.

• Turn TECH 2 on (TECH 2 must be at the title screen).
• Open TIS 2000 and select Service Programming System and follow the screen instructions.
• When the data transfer is completed and the Program Controller screen is displayed close TIS 2000.
• Disconnect TECH 2 from the PC and reconnect TECH 2 to the vehicles DLC.

• Connect TECH 2 to DLC, turn TECH 2 on, at the TECH 2 title screen press ENTER and select the following:
• F1: Service Programming System (SPS)
• F1: Program ECU (F1: Program ECU will be flashing)

• Then follow TECH 2 screen instructions.
• When TECH 2 displays Programming Successful, press the EXIT key.
• Turn off ignition and disconnect TECH 2 from the vehicle.

BCM Link to PCM/PIM

If one or more of PCM, PIM or BCM have been replaced, the modules must be security linked to each other. If

the procedure is not performed, the vehicle will not crank or run.

This linking procedure has to be performed as follows:

• Connect TECH 2 to DLC and select the following:
• Diagnostics / (X) 1999 / WH Statesman or Caprice / BODY / BODY CONTROL MODULE / SECURITY /

BCM LINK TO PCM/PIM / select applicable engine and follow TECH 2 instructions.
NOTE: On vehicles with a GEN III V8 engine it will be necessary to obtain TIS approval during the linking
procedure. When instructed to obtain TIS approval by TECH 2, use the following procedure:

• Disconnect TECH 2 from the vehicle.
• Using the RS232 connector lead, Hardware Key and TECH 2 power lead, connect TECH 2 to a Personal

Computer (PC) with TIS 2000 installed.

• Turn TECH 2 on so that the TECH 2 screen displays "TECH 2".
• Open TIS 2000 and select Enable Programming, then follow the screen instructions.

• When TIS 2000 displays the Programming Enabled screen close TIS 2000.
• Disconnect TECH 2 from the PC and reconnect TECH 2 to the vehicles DLC.
• On TECH 2, select Diagnostics / (X) 1999 / WH Statesman or Caprice / BODY / BODY CONTROL

MODULE / SECURITY / BCM LINK TO PCM/PIM / select applicable engine and follow TECH 2 instructions
again.

• For additional information regarding TECH 2 and this linking procedure, refer to TECH 2 DIAGNOSIS FOR

BCM in Section 12J-1 LOW SERIES BCM in Volume 14C or Section 12J-2 HIGH SERIES BCM in Volume

14D of the VT Series Service Manual.

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