At the end of my first post I said i would like to test using a later model ecu in place of the early units for the bigger injector data rates. Guess what.. This is that post.

Since i had already worked out how to get the 2010+ ecu to work in my VY ute with the VZ PIM, it was relatively simple to switch it over, the only concern was the use of the existing 2008/09 gearbox i had fitted to make it compatible with the early ECU code.

Luckily the 2009 TCM 24249179 calibration can be configured to work with both early & late ECU code, in fact GM did it from the factory for the 2010 Model Camaro’s, the main changes that were needed to get it to work with the early ecu/pim were kept in the TCM, with changes occurring only in the ECU.

ECU is now using OS 12639270, which was used on the 2011 Auto HSV’s & Holdens. I won’t go into too much details on all the changes but the main ones modified to match that of the pre 2011 ECU were:

• Fuel Level Sensor Count & Calibration data
• CAN TX & RX settings to/from GB, PIM & ABS module
• IAT Sensor Data
• MAP Sensor Data
• Tacho Type
• Starter Relay Type from 12V to GND
• Engine Oil Temp to Calculated
• VSS to Pulse & Data to Early CAN
• Diff Gear ratio
• Oil Level Switch fitted – No
• Ambient Air Temp Sensor Fitted – Yes
• Extended Brake Diagnostics Enabled
• Regulated Voltage Control – Off
• RVC- Override Disabled
• Analog Brake Select – Yes
• PPEI3 Select/Present – No
• Speed output Type = VehRepTos
• Halving the VSS pulses per rev in ecu, to double up the output pulse for the VZ speedo cluster as it was running at half the rate. The early ECU has an additional calibration value to change the output pulse.

Work in progress is trying to get the Immobilizer/VATS stuff working. Ironically this broke even when i flashed a slightly newer os calibration in the old/original ecu. so there is something different in the way the immobilizer configuration is setup.