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Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Car
Satisfied Customers: 1044
Experience:  16 years of experience
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These are the readings I got from the Key on key off.

Customer Question

These are the readings I got from the Key on key off.
Positive Key on
1. +12.05 -3.60
2.+12.04 -3.60
3.+12.05 -3.60
4. +12.04 -3.58
5. +12.04 - 3.60
6. +12.04 - 3.64
7. +12.04 -3.60
8. +12.04 - 3.61positive key off
1. +1.15 -0.24
2. +1.15 -0.37
3.+1.15 -0.37
4. +1.15 -0.36
5. +1.15 -0.54
6. +1.15 -0.56
7 +1.15 -0.51
8. +1.15 -0.43negative key on
1. -8.41
2. -8.48
3. -8.50
4. -8.49
5. -8.50
6. -8.46
7. -8.49
8. -8.48negative key off
1. -11.42 +11.17
2. -11.41 + 11.17
3. -10.90 +11.17
4. -10.58 +11.18
5. -11.13 + 11.18
6. -11.52 +11.18
7. -10.84 +11.18
8. -11.37 + 11.89
Submitted: 3 months ago.
Category: Car
Expert:  Kalamykid replied 3 months ago.

Can you do the same tests key off with the ecm unplugged please?

Customer: replied 3 months ago.
I will have it in the morning
Expert:  Kalamykid replied 3 months ago.

Thank you.

Customer: replied 3 months ago.
w/ ECM unplugged
key off neg ground
1. +.06 -.04
2. +.06 -.04
3.+.06 -.04
4. +.06 -.05
5. +.05 -.05
6. +.06 -.06
7. +.05 -.06
8. +.07 -.06key on neg ground
1.+2.32 -6.19
2 +2.26 -4.58
3. +2.21 -4.00
4. +2.20 -4.20
5. +2.16 -5.20
6. +2.15 -4.11
7. +2.12 -4.34
8. +2.12 -5.41key off positive ground
1. +12.17 -11.68
2. +12.16 -11.96
3. +12.15 -11.45
4.+12.16 -10.81
5. + 12.38 -11.91
6. +12.33 -12.24
7. +12.27 -11.18
8. +12.02 -11.82key on positive ground
1. +10.02 -6.71
2.+10.02 -7.91
3. +10.04 -7.65
4.+10.04 -6.86
5. +10.04 -6.82
6. +10.06 -8.3
7. +10.07 -7.93
8. +10.09 -6.86
Expert:  Kalamykid replied 3 months ago.

I can't really understand your readings. The only thing I need to know it with the computer unplug the injectors unplugged your meter set to DC voltage. What is the voltage on the two wires to the computer from the injector? If you can explain the numbers better that would help me tremendously. But from what I hear you've got major wiring problems. The wires to the injectors go straight to the computer. You should not have any voltage on any of the wires with the computer unplug as well as all the injectors.

Customer: replied 3 months ago.
positive ground :means red side of meter to positive side of batterry...neg ground mean: black lead to neg side of battery....just like u told me to do ....key on/ key off...the results i just sent u, is w/the computer unplugged
Expert:  Kalamykid replied 3 months ago.

If you had the computer unplugged then you should not have gotten anything on any of the wires. The computer feeds both the power and the ground to the injectors.

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