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Power probe IV driver test mode. How useful is it?

  • benphillipstn
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10 Mar 2019 22:02 - 10 Mar 2019 23:36 #27731 by benphillipstn
Power probe says: Modern ECUs have circuits that let the ECU know if a component is actually plugged in.

Has anyone encountered a ecu that needed voltage on the control circuit before it would activate it?
Last edit: 10 Mar 2019 23:36 by benphillipstn.

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  • Noah
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11 Mar 2019 06:39 - 11 Mar 2019 06:41 #27735 by Noah
Last week.
05 Cobalt, codes for 1-2 shift solenoid. Checked operation of the driver with scan tool and test light, nothing. Confirmed results by testing 3-4 solenoid.
Measured current draw of 1-2 solenoid with computer disconnected, 10 amps!
So it needs a computer and a shift solenoid.
After repair of trans and computer replacement, immediate TCC fault codes that will not clear.
So I connected the PP4 to the control wire for the TCC solenoid in "driver test mode", cleared the codes and they stayed gone. Activated the driver with the scan tool to prove the problem was with the solenoid in the trans, not the new/used computer.

I broke the solenoid reinstalling the side cover and had to go back in...

"The circuits in cars are not nanby-pamby Chinese consumer electronics "
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Last edit: 11 Mar 2019 06:41 by Noah.
The following user(s) said Thank You: Tutti57, benphillipstn

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