opti question using meter.
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Instructor
Joined: Sep 2015
Posts: 143
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opti question using meter.
Hello,
92 lt1. No spark, no fuel. Using meter today have 10 volts at icm pins a and d. Have 5 volts high and low resolution voltage at opti test connector. Do not have 1 to 4 volts at icm pin b while cranking. Which way is the communication ? Is the opti sending a signal to the ecm, and I would have voltage, or other way around ? I have a bouncing tachometer and looks like steady oil pressure rising on gauge to make oil sending switch. Have code C 12. No other codes . I can't tell if it's and opti,ecm, or other ? Need some help.
92 lt1. No spark, no fuel. Using meter today have 10 volts at icm pins a and d. Have 5 volts high and low resolution voltage at opti test connector. Do not have 1 to 4 volts at icm pin b while cranking. Which way is the communication ? Is the opti sending a signal to the ecm, and I would have voltage, or other way around ? I have a bouncing tachometer and looks like steady oil pressure rising on gauge to make oil sending switch. Have code C 12. No other codes . I can't tell if it's and opti,ecm, or other ? Need some help.
Le Mans Master
Joined: Aug 2015
Posts: 6,086
Likes: 1,972
From: St. Charles MO
Hello,
92 lt1. No spark, no fuel. Using meter today have 10 volts at icm pins a and d. Have 5 volts high and low resolution voltage at opti test connector. Do not have 1 to 4 volts at icm pin b while cranking. Which way is the communication ? Is the opti sending a signal to the ecm, and I would have voltage, or other way around ? I have a bouncing tachometer and looks like steady oil pressure rising on gauge to make oil sending switch. Have code C 12. No other codes . I can't tell if it's and opti,ecm, or other ? Need some help.
92 lt1. No spark, no fuel. Using meter today have 10 volts at icm pins a and d. Have 5 volts high and low resolution voltage at opti test connector. Do not have 1 to 4 volts at icm pin b while cranking. Which way is the communication ? Is the opti sending a signal to the ecm, and I would have voltage, or other way around ? I have a bouncing tachometer and looks like steady oil pressure rising on gauge to make oil sending switch. Have code C 12. No other codes . I can't tell if it's and opti,ecm, or other ? Need some help.
