I recently dropped an LT4 GM crate engine (19332621) into my 2016 Camaro 2SS manual and I am having trouble coming up with a suitable tune.
My plan was to reference tunes from the 2016 Corvette Z06 and the 2016 Cadillac CTS-V which both have the LT4 engine and use the same ECM hardware.
The problem I'm having I believe is due to the combination of the Camaro, Corvette, and CTS-V operating systems all being different as well as some wiring differences/new sensors on the LT4 that were not present on the LT1.
The symptoms include:
P0101 - Mass or Volume Air Flow A Circuit Range/Performance
P0106 - Manifold Absolute Pressure/BARO Sensor Range/Performance
P1101 - Mass Air Flow Sensor Out of Self-Test Range
P2227 - Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
I think whats going on is that Ive wired these sensors to match the new 2017 Camaro ZL1, which happens to also match the Z06 and CTS-V that I'm referencing, but the Camaro operating system doesn't adapt.
Here's what I've changed with the wiring. (Notation: X1,X2 are the harness connections. #XXX are wire numbers.)
X1:
#4, #5 - Signal and reference wires from Throttle Inlet (Airbox) moved to Supercharger Inlet Air Pressure signal and reference
#13 - Wire added for Induction Air Temperature Sensor 2 signal which is used by the primary temperature and pressure sensor
#20 - Wire added for Super Charger Inlet Air Pressure Sensor Low Reference
X2:
#43, #44, #63 - Moved signal, 5V reference, and low reference wires used for primary MAP (These wires didn't really change, the physical location on the engine simply changes to wire to the primary pressure sensor on the back of the engine.)
#71 - Control wire added for SC Bypass Control (This wire provides ground whenever the bypass control should open)
#45, #64 - Signal and 5V Reference wires added for the Throttle Inlet Absolute Pressure Signal (Airbox)
So, just for kicks I loaded the Z06 OS with non-engine parameters from the Camaro and the new OS seems to be okay with the wiring. Everything engine related mostly works fine with the exception of the MAP sensor code P0106 - Manifold Absolute Pressure/BARO Sensor Range/Performance. The default Map sensor settings for the Z06 and CTS-V are: Linear 425.00 kPa, Offset -32.50 kPa. These values seem wrong for the Bosch MAP sensor 0 261 230 042, which I believe is a 2.5 bar sensor. I'm sure there's a good reason for this factory setting, but it doesn't seem to match the sensor. As a test, I changed the values to Linear 270.59 kPa, Offset -164. This got rid of the code, but the SC bypass seems to pretty much stay open all of the time.
Anyway, I cant use the Z06 OS because it causes way too many other problems like the gear indicator showing a 7 when its in reverse, the magnetic ride control modes wont change, etc., etc. So until the 2017 ZL1 OS is available, I need to figure out a way to get the Camaro SS OS to function even though the wiring is slightly different than what its expecting. I thought about trying the CTS-V OS, but since those only come in an Automatic and have a TCM component I figured I would just end up having different problems.
100 2016 Camaro OS with CTS-Z06 Mix.hpt
100 2016 Camaro OS with CTS-Z06 Mix.hpl
2016 Camaro 2SS Stock.hpt
2016 Corvette Z06.hpt
2016 CTS V Stock.hpt