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I have found the fuel pump control unit but trying to work…

Customer Question
I have found the...

I have found the fuel pump control unit but trying to work out which colour wire is the PWM (FPC) on my SC400 (1991) Sorry my name is ***** ***** Kilby]

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

If I connect the fuel pump to B+ the fuel pump runs at full power (noisy) but car starts and gives dark grey smoke

Submitted: 2 years ago.Category: Australia Car
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Customer reply replied 2 years ago
It doesn't have colours on the pinouts for the wires. Just codes like B+ (battery 12v) FPC, Di (sends 12v back to to tell ecu is working) I think one may be earth, so that is 5 pins
->B (12v)
->FPC
<-fuel pump
<-Di
Earth
Answered in 5 hours by:
2/22/2016
AU Auto Mechanic: indy-tech, Australia Car Mechanic replied 2 years ago
indy-tech
indy-tech, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 7,446
Experience: All import and domestic car repairs and diagnostics
Verified

If you can energize the Fuel pump with the jumping the B+ in the DLC 2 then check the EFI main opening relay .

Or have you tested this relay .

Greg

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Customer reply replied 2 years ago
The fuel pump runs with B+ no problems albeit at full power. I need to keep the variable fuel pump rate.
Customer reply replied 2 years ago
If I can work out what wire does what. At least if I can find out which wire is the pulse width modulation, I can make up my own circuit to regulate the power going to the fuel pump.
Customer reply replied 2 years ago
Ok so now I know what PWM is, how do I check to see if PWM is working? Do I use AC on an analogue meter? Or do I use a digital meter on AC?
AU Auto Mechanic: indy-tech, Australia Car Mechanic replied 2 years ago

Kilby PMW do not read or speak Analog, only digital .

What you trying to test .

Check the connections and wiring to the Fuel pump ECU if you have the pump working then you are not getting power from your FP ECU.

Rgds Greg

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Customer reply replied 2 years ago
Fuel pump works. If the fuel pump controller isn't getting a pwm signal, then basically it won't turn on the pump. So that's why I want to check the pwm signal. But how?
AU Auto Mechanic: indy-tech, Australia Car Mechanic replied 2 years ago

Do you have power at pin 6 green wire (Fuel pump ECU) when cranking the engine .This is power to the fuel pump when cranking ;

No power , check the voltage at the FPC red / green wire..if no power from the ECU then you have a bad ECU

Greg

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Customer reply replied 2 years ago
There is no PWM coming from the red/green line. But when I connect the OBD scan tool to the car, I get a connection error. Strangely, if I force the fuel pump to work using +B (joining Red wire with green wire) , the engine will start.
Customer reply replied 2 years ago
I mean +B and FP joined will start the car but pump will run at full speed. There is no pulse width modulation coming down the FPC line. Does that mean the ECU is not happy? I tried to connect to the ECU using an ODB1-> odb2 wireless reader but so far no luck.
AU Auto Mechanic: indy-tech, Australia Car Mechanic replied 2 years ago

Sounds like a bad ECU.

You need to try another .

Greg

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