1999 DF70 EFI Feul Pump or ECM not working

[reelly11]

Hi, Thanks in advance for any insight. I am helping someone with a Suzuki DF70 1999. The motor has set up for a while and the entire fuel system had to be cleaned. The fuel pump is still not working here is what has been done:
1)Fuel pump did not work when hooked directly to battery so new pump was installed.
2)Fuel pressure regulator was replaced.
3)Needle and seat in VST tank replaced.
4)Final filter on pump and inline filters replaced.
5)Fuel rail and lines cleaned.

After all that the new pump will not kick on with the key in the on position. I can straight wire it with 12 volts and will come one.
The fuel pump fuse is good and verified.

Testing with a 12v meter I have 12V on the pink wire at pump if grounded to block. If tested on pink and the black/white wire at pump I have 10.5V.

I have come to the conclusion (I Think) that the ECM is not cutting pump on. ( I assume it does this with ground) I have grounded ECM directly to battery with external ground wire with no different result.

I do not have a wiring schematic so I do not know how to verify that the ECM is even getting 12V. The grey wire coming from the Fuel relay has 12V going into the ECM though.
I have taken the fuel rail out of block and turned over motor and injectors are not firing. Leaves me to believe the ECM is not operating.
Can anybody advise me on what to do next?? ???

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Testing with a 12v meter I have 12V on the pink wire at pump if grounded to block. If tested on pink and the black/white wire at pump I have 10.5V.

Test the voltage at the pump on the pink and black/white wire. Turn the key off. Should read 0v. Turn the key to on it should read battery voltage for 3 seconds or so while the high-pressure pump primes. If not then you may need a new ECU.

 

[reelly11]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks trendsetter240,
I have done that and the voltage at the connector is around 10.5 V with key on or off. Not looking good.

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks trendsetter240,
I have done that and the voltage at the connector is around 10.5 V with key on or off. Not looking good.

I was testing the fuel system on the same engine over the weekend. My high pressure pump ended up being blown.

I have the wiring diagram and testing procedures at home. I will post more info for you when I get there in a couple hours.

 

[reeldutch]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Bring it to a dealer.

they can do an actuator test when its hooked up with SDS , or swap a ecm to see if thats the culprit.

those ecm s are expensive.

 

[reelly11]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks trendsetter240 for the wiring diagram possibly and troubleshooting tips that would be great!

Yea reeldutch it is looking that way but I would like to do what i can before then. I am about at that point though..

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks trendsetter240 for the wiring diagram possibly and troubleshooting tips that would be great!

Yea reeldutch it is looking that way but I would like to do what i can before then. I am about at that point though..

OK. Here is what my motor reads with a known good ECU. Mine is a 2000 model Evinrude 70 which is the same powerhead as a DF70.

Voltmeter red to pink and black to black/white:

Key off: 0v
Key on: 13v for a second or so then 11.5v and holds.

My service manual describes the test as:

If the meter shows battery voltage for 3 seconds during this test (and the pump does not prime) then replace the pump. If not then connect voltmeter red to pink, black to a clean engine ground and turn key to on. If voltage is present replace ECU. If no voltage is present replace or repair engine harness.

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

I have taken the fuel rail out of block and turned over motor and injectors are not firing. Leaves me to believe the ECM is not operating.

How did you test the injectors in this case? Did you watch for fuel spraying out? It may have been that they simply weren't getting fuel past the HP pump.

You can test the ECU control of the injectors by unplugging the injector electrical connections and plugging in injector test lights or "noid" lights.

The firing order for the injectors is 1-3-4-2.

 

[reelly11]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks Trendsetter,
I tested the fuel injectors by just pulling the entire fuel rail out of intake and turning motor over. The fuel rail was charged with fuel. I "hot wired" the fuel pump with straight 12V to pressurize the fuel rail and see if motor would start. So unless they are completely clogged up they were not firing either. I do not have a test light for the injectors.

Ok on the voltage test here is what i get.

testing the pink and black/white wire at connector
key off- I get 10.5V
key on- still 10.5V no change, there is no 12-13V at first three seconds.

Testing to engine ground
key off- 0V
key on- 12V

not looking good

I am recharging battery, the battery voltage is reading 12.2 volts instead closer to 13V. I dont that is my problem but I will try any last resorts. Thanks again!

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks Trendsetter,
I tested the fuel injectors by just pulling the entire fuel rail out of intake and turning motor over. The fuel rail was charged with fuel. I "hot wired" the fuel pump with straight 12V to pressurize the fuel rail and see if motor would start. So unless they are completely clogged up they were not firing either. I do not have a test light for the injectors.

Ok on the voltage test here is what i get.

testing the pink and black/white wire at connector
key off- I get 10.5V
key on- still 10.5V no change, there is no 12-13V at first three seconds.

Testing to engine ground
key off- 0V
key on- 12V

not looking good

I am recharging battery, the battery voltage is reading 12.2 volts instead closer to 13V. I dont that is my problem but I will try any last resorts. Thanks again!

I hate to say it but it's sounding like you have a bad ECU. Before you replace the ECU you will want to ensure that all your wiring connections are clean and that there are no shorts. You don't want to plug in a new ECU only to have it blown. Might just be time to bring it into a dealer as mentioned.

 

[reelly11]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks Trendsetter, Yea we talked about taking it to a dealer tomm. Do you know what the readings are supposed to be on the system relay. I have four wires as follows.

White 12V key on or off.
Two grey wires 12V with key on 0V with key off
The pink/black is what I have a question about, it reads 4.5V with key on and 0V with off. ?? That one goes to ECM what gives?
Thanks and after this it is going out of here.

 

[trendsetter240]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Thanks Trendsetter, Yea we talked about taking it to a dealer tomm. Do you know what the readings are supposed to be on the system relay. I have four wires as follows.

White 12V key on or off.
Two grey wires 12V with key on 0V with key off
The pink/black is what I have a question about, it reads 4.5V with key on and 0V with off. ?? That one goes to ECM what gives?
Thanks and after this it is going out of here.

Here are my results, tested red onto relay, black onto engine ground.

White: 12.7v key on of off. (Battery voltage)
Gray#1: 0v key on or off.
Gray#2: 12.7v Key on, key off 5v and slowly dropped down to 0v after about 30 seconds.
Pink/black: 0v key on or off.

White is your power from the 30a fuse.
Gray#1 goes to a capacitor and your wiring harness.
Gray#2 goes to your ignition coils, fuel injectors and fuel pump 15a fuse.
Pink/Black goes back to ECU. (I think this is a signal cable but my diagram doesn't show)

I hope that can provide you some help, I can't really be sure what your issue is. Have you checked everywhere for shorted connections? I'd be leaning towards the ECU as the culprit.

 

[flyboywithyz]

Re: 1999 DF70 EFI Feul Pump or ECM not working

Hi,
I have exactly the same problem - turn the key on and the pump will start, but not run anymore than 1/2 a second. I have installed a new HP pump and seperator, but still the same problem.
I think I have an ECM problem - with the connector to the pump unplugged, I get 12 Volts, but when plugged in, nothing. I have traced it back to the earth from the ECU, as it just drops out. The pump runs fine with direct 12volts applied to it - I was thinking of trying the motor with 12v directly applied, but it looks like the injectors also use the same common, so they wouldnt work either.
I will have to have a dealer check it out, but not looking too good.