[gtpvette]

Here’s the rundown on the wiring harness changes. Basically I pulled the wires for things I won’t or can’t use. There are three plugs to the PCM, X1, X2 and X3 and I only pulled wires from X1 and X2. There were a few other wires in the harness that I didn’t know what they did and I pulled them.

X1 – Pulled Wires
Pin Description
9 Fuel Tank Sensor
10 Fuel Tank Sensor
25 Fuel Level Sensor
26 Fuel Level Sensor
27 Fuel Level Sensor
44 Fuel Pump Relay Control
66 EVAP Vent Control
70 Accessory Wakeup
72 Coil Relay Control

X2 – Pulled Wires
12 O2 Sensor 2
13 O2 Sensor 2
28 O2 Sensor 2
29 O2 Sensor 2
42 O2 Sensor 2
51 EVAP Purge Control
60 Oil Level Signal
62 O2 Sensor 2

Power Requirements to Harness
2 15 amp ignition circuits for Coils
1 15 AMP ignition circuit for MAF
1 15 AMP ignition circuit for 2 O2 sensors
1 15 AMP constant battery circuit for PCM
1 15 AMP ignition circuit for PCM

Harness Connections to rest of car
AC Relay – Don’t exactly know about this as of yet. Need to check with MRS-Collin
6 connections for gas pedal
2 Connection for LAN (MRS-Collins device)
Ignition
3 – AC pressure sensor signals
Fan relay low
Fan relay high
Check engine light – Need to check with MRS-Collin if needed
Park Neutral Signal – Starter??? Don’t know if this is needed
Starter Relay signal??? Don’t think this is needed as the FRS systems should provide this
Cruise Brake Signal??? Need to review
Brake Clutch Signal??? Need to review

Current Performance Fuse Box
This box will provide the fused ignition power as well as fused battery power to the harness/PCM. I’m assuming I’ll tie the Ignition and Starter Relay signal in this fuse box to the FRS Ignition and Starter relay signals.
Fans relays will be tied to the LFX PCM.
This box has the AC Compressor relay but I’m not exactly sure how this will be driven yet. I would guess it’s either the FR-S relay or the LFX PCM. I would assume it’ll have to come through the LFX PCM as it watches the pressure in the system and needs to be able to switch it off. I need to ping Collin and get his thoughts.

This box also has a relay circuit for the fuel pump but I’m assuming the FRS systems will take care of that.


As a sidebar,, the pulley bracket goes to welding tomorrow.