MIL / Service engine light voltage
02-13-2019, 08:53 PM
#1
TECH Enthusiast
Thread Starter
MIL / Service engine light voltage Anyone know the voltage from the PCM computer to the trouble / error / code light?
Is it going to ground in the PCM or is the volts coming out.
Reason: I'm trying to hold up a light in the dash.
Is it going to ground in the PCM or is the volts coming out.
Reason: I'm trying to hold up a light in the dash.
Last edited by Tramminc; 02-14-2019 at 02:15 PM.
02-22-2019, 04:11 PM
#2
I'm running an E38 PCM from an '07 LS2, and according to the tech at Current Performance where I bought my harness, the Check Engine light wire from the PCM is a switched ground.
02-23-2019, 07:25 PM
#4
TECH Fanatic
On my 896 / 411 PCMs, the MIL light wire is supplied with keyed 12 volts positive and will illuminate the check engine light when the PCM detects a code and then provides a ground for the MIL wire.
Rick
Rick