1G DSM and Galant VR-4
Installation involves tapping into three wires: +12V, GND and the O2 sensor output.
| SIGNAL | ECU wire color | ECU pin number | AFR Meter wire color |
| +12V | RED | 107 | RED |
| Ground | GREEN/BLACK | 24 | BLACK |
| O2 | WHITE | 4 | GREEN |
1G DSM ECU connector.
The pin numbers are shown as looking at the wires coming out of the ECU connector ECU plug.
Click HERE for ECU removal instructions.
2G DSM
Installation involves tapping into three wires: +12V, GND and the O2 sensor output.
| SIGNAL | ECU wire color | ECU pin number | AFR Meter wire color |
| +12V | RED | 25 | RED |
| Ground | GREEN/BLACK | 92 | BLACK |
| O2 | WHITE | 76 | GREEN |
2G DSM ECU connector.
The pin numbers are shown as looking at the wires coming out of the ECU connector ECU plug.
Every car is different when it comes to your tuning settings. This is because the air flow meters differ by up to 15%, (that is the reason for the adjusting screw). Any recommended settings are a starting point only. You set it by looking at the O2 voltage. The O2 sensors were never designed to be accurate to with in .1v For the most part these numbers will help but you can not compare numbers as gospel with someone else's.
At idle and part throttle you want to see the voltage cycling up and down between .2 and .8 roughly.
Typically it will go (O2 voltage):
.2-.8-.3.-.8-.1-.6-.2-.8-.3-.8-.4.-.9..2-.8-.2-.8.1-.9.........up and down, up and down, up and down........
When you go past 40% throttle the voltage will be set at what ever you have the AFC set at. This is the same for full throttle.
On 91 octane gas you will want .94-.95v If you are at a higher altitude
then lower voltage is OK.
On 92 octane gas you will want .94v
On 93-94 octane gas you can get away with .92v
When the O2 sensor heats up after several runs, the voltage out put will drop off a little. What was .94v will drop to .92v. This is normal.
The O2 voltage will vary a lot more from car to car. Your numbers can vary from these easily by as much as .05v. 1G cars have more grounding issues and 90s in particular will read leaner (lower voltage) With a 1G car the compression is lower too so you can run leaner before getting knock that retards timing.
On 91 octane gas you will want .89 to .91v If you are at a higher
altitude then lower voltage is OK.
On 92 octane gas you will want .88v
On 93-94 octane gas you can get away with .86v
The same applies to the O2 Voltage when the O2 sensor heats up, it will drop some.
For more info see http://www.roadraceengineering.com/newafc.htm