TPS low voltage
#3
#4
Registered
I don't have a wiring diagram handy, but most likely ECT, IAC, MAP, IAT. Have you done any work on it lately like maybe pulling the intake plenum? It may have a wire pinched and grounded out.
Last edited by snapmorgan; 05-03-2023 at 09:12 AM.
#5
VIP Member
VIP Member
I have seen a bad IAC cause weird voltage readings...is the boat idleing really bad?
#6
#7
ok I’ll take a look. Is there a way to test the 5v reference wires to see if any are grounded?
#8
Registered
You will need a wiring diagram and/or a pinout of the ECM. There is probably just one 5V reference wire from the ECM that will split off to all of the sensors. You will need to measure voltage at the ECM on that wire. If you have 5v I would then go to the splice and you will most likely find your problem there. If you don't have 5V out of the ECM, you will need to disconnect that wire from the ECM and measure again. Any short on that wire will drop the voltage out of the ECM. If still low voltage at ECM, you need a new one. If you now have your 5V at the ECM, you have a wire/sensor shorted. I would start by checking for 5V at the rest of the sensors. If you have voltage there, It could just be a bad connection at the splice going to the TPS. If no 5V with all of the sensors disconnected, probably bad ECM or wire shorted to ground or the splice has come apart.
#9
Registered
Think the ECT sensor is a 3 wire sensor also.