Bike not starting

[Killakody]

I have a 2005 Yamaha fz6 that was purchased recently. Tried to start it, and it turns over but won’t start.

when I turn the bike on, I get 4 codes.
13,21,41 and 46.

any help would be greatly appreciated.
Thanks in advance, Kody.
Also, will not start even with starting fluid.

 

[TownsendsFJR1300]

Pull your plugs, crank and check for spark.

If sparking, check compression.

.

 

[Gary in NJ]

I have a 2005 Yamaha fz6 that was purchased recently. Tried to start it, and it turns over but won’t start.

when I turn the bike on, I get 4 codes.
13,21,41 and 46.

any help would be greatly appreciated.
Thanks in advance, Kody.
Also, will not start even with starting fluid.

Code 13 = Intake air pressure sensor - open or short circuit (likely a connector issue or a short in the wiring harness)
Code 21 = Open or short circuit in the coolant temperature circuit (likely a connector issue or a short in the wiring harness)
Code 41 = Open or short circuit in the lean angle cut-off switch (likely a connector issue or a short in the wiring harness)
Code 46 = Power supply to the fuel injection system relay is not normal (likely a connector issue or a short in the wiring harness or a low battery)

Codes 13, 21 & 41 all have sensors that are in the fault tree as well, but for all three sensors to fail at the same time would be the unlucky lottery indeed. This is likely a connector issue. Were you doing any maintenance or modifications to the bike recently?

I didn't take the time to see if those 3 sensors share the same connector, but my spidy sense says they do. They all terminate at the ECU...so I would check those connectors first.

While you are searching for a loose or broken connector...be sure to charge the battery to clear code 46. Since this is a new-to-you bike, while you are checking connectors, take the time to spray them with contact cleaner, blow 'em out with air, and then use dielectric grease prior to reassembly. If this bike has been living outside...that alone may solve the current problem and future problems.

 

[Motogiro]

Welcome to our great community!

All of those sensors mentioned from the error codes are common to a black with a blue tracer wire that comes from the ECU. Those sensors each have their own 3 wire or 2 wire plug. Since all are in the error chain I would suspect the connector at the ECU because you're also seeing a malfunction from the fuel injection voltages being off. The fuel injection is fed from a different circuit but actuated via the ECU. It could even be the ECU plug is not completely seated into the ECU. The ECU plug has 26 wires.
Let us know what you find.

 

[Killakody]

So I got to work on the bike a little bit, do not have spark nor fuel. Went into diag mode and my lean-angle sensor is reading 5v, which means that the that it won’t get spark/fuel, correct? I cannot find the sensor. If y’all could show me a picture of where to look, I would highly appreciate it.

 

[TownsendsFJR1300]

Part #27, under the right pod:

 

[Killakody]

Part #27, under the right pod:


View attachment 74125

Is it by the fuse box? If So, I found the wires but no sensor. I will take a picture of the mounting to see if I’m looking at where it should go.

 

[Motogiro]

So I got to work on the bike a little bit, do not have spark nor fuel. Went into diag mode and my lean-angle sensor is reading 5v, which means that the that it won’t get spark/fuel, correct? I cannot find the sensor. If y’all could show me a picture of where to look, I would highly appreciate it.

The lean angle sensor will not prevent spark. It will tell the ECU there is a problem and then the ECU will not allow spark/fuel etc.
Does the service manual say what voltage is normal at the lean angle sensor? Transistor logic is many times regulated from a 5 volt source that would be regulated via the ECU. That means that 5 vdc would not have to mean there is a problem unless the service manual indicates 5 vdc is a problem.
You are having multiple errors that appear from more than one sensor. You are also showing an error code from fuel injection.

I would first go the the plug at the ECU. Unplug it and inspect the plug and the pins on the ECU (There are 16 pins) for corrosion etc.

If you read posts numbered 3 and 4 you will see why we think this is a possibility.
In summary you will not get spark if the ECU can not see the Crankshaft Position Sensor signal which is also on the same sensor circuits. Those circuits may actually be provided source voltage from a 5 vdc source that the ECU provides.

 

[Motogiro]

Is it by the fuse box? If So, I found the wires but no sensor. I will take a picture of the mounting to see if I’m looking at where it should go.

Uh Oh!

 

[trepetti]

Uh Oh!

Looking at the above photo I see the fuse box pulled off its mount and the bolts for the tip-over sensor. No sensor?

 

[Motogiro]

Did someone remove the lean angle sensor and try to bypass the circuit? That may be the problem. Shorting the sensor voltage on all the sensors to ground.
Did this bike run when you got it?

 

[trepetti]

The lean angle sensor will not prevent spark. It will tell the ECU there is a problem and then the ECU will not allow spark/fuel etc.
Does the service manual say what voltage is normal at the lean angle sensor? Transistor logic is many times regulated from a 5 volt source that would be regulated via the ECU. That means that 5 vdc would not have to mean there is a problem unless the service manual indicates 5 vdc is a problem.
You are having multiple errors that appear from more than one sensor. You are also showing an error code from fuel injection.

I would first go the the plug at the ECU. Unplug it and inspect the plug and the pins on the ECU (There are 16 pins) for corrosion etc.

If you read posts numbered 3 and 4 you will see why we think this is a possibility.
In summary you will not get spark if the ECU can not see the Crankshaft Position Sensor signal which is also on the same sensor circuits. Those circuits may actually be provided source voltage from a 5 vdc source that the ECU provides.

I just took a look at the schematic. That is some BUSY wire! I am in the process of reassembling my 05 and you can BET I am going to break out the contact cleaner and dielectric grease!

 

[Killakody]

Did someone remove the lean angle sensor and try to bypass the circuit? That may be the problem. Shorting the sensor voltage on all the sensors to ground.
Did this bike run when you got it?

it looks like they tried to bypass it, I bought the bike last week. He had it started, but it wouldn’t stay running.

 

[Killakody]

The lean angle sensor will not prevent spark. It will tell the ECU there is a problem and then the ECU will not allow spark/fuel etc.
Does the service manual say what voltage is normal at the lean angle sensor? Transistor logic is many times regulated from a 5 volt source that would be regulated via the ECU. That means that 5 vdc would not have to mean there is a problem unless the service manual indicates 5 vdc is a problem.
You are having multiple errors that appear from more than one sensor. You are also showing an error code from fuel injection.

I would first go the the plug at the ECU. Unplug it and inspect the plug and the pins on the ECU (There are 16 pins) for corrosion etc.

If you read posts numbered 3 and 4 you will see why we think this is a possibility.
In summary you will not get spark if the ECU can not see the Crankshaft Position Sensor signal which is also on the same sensor circuits. Those circuits may actually be provided source voltage from a 5 vdc source that the ECU provides.

Ecu connector is clean as a whistle.

 

[Gary in NJ]

Wait a minute

When you purchased this bike, was it running? Or did you purchase a non-running bike.

If you purchased a non-running machine, you will need to buy a replacement Lean Angle Sensor. If this bike was running, but now it's not...did someone steal your sensor?

 

[Killakody]

Wait a minute

When you purchased this bike, was it running? Or did you purchase a non-running bike.

If you purchased a non-running machine, you will need to buy a replacement Lean Angle Sensor. If this bike was running, but now it's not...did someone steal your sensor?

So, the bike was non-running. BUT somehow, it started and idled for a second.

 

[Gary in NJ]

The Lean Angle Sensor has a connector with three wires; Blue, Yellow/green and Black/blue.

The Blue and Black/blue are reference power from the ECU and are shared with the Speed Sensor, Throttle Position Sensor and Intake Air Pressure Sensor. The Yellow/green is the actual sensor wire.

I don't see that connector, or any wires of those colors in your photo. Hopefully you didn't purchase a bike with a hacked harness. Being that some of the above sensors are also throwing codes...I think you might be dealing with some hackery here.

 

[Killakody]

The Lean Angle Sensor has a connector with three wires; Blue, Yellow/green and Black/blue.

The Blue and Black/blue are reference power from the ECU and are shared with the Speed Sensor, Throttle Position Sensor and Intake Air Pressure Sensor. The Yellow/green is the actual sensor wire.

I don't see that connector, or any wires of those colors in your photo. Hopefully you didn't purchase a bike with a hacked harness. Being that some of the above sensors are also throwing codes...I think you might be dealing with some hackery here.

I didn’t take a picture of it, but all three wires are there. Looked like someone cut the connector off and tried to bypass it somehow.

 

[Motogiro]

I didn’t take a picture of it, but all three wires are there. Looked like someone cut the connector off and tried to bypass it somehow.

When you say, (tried to bypass it somehow), are there resistors or are any wires connected? Or are they just not connected?

 

[Killakody]

When you say, (tried to bypass it somehow), are there resistors or are any wires connected? Or are they just not connected?

The yellow/green and blue are connected