SOLVED - TORO ZS5000 - nothing happening when turning ignition key...no problems the day before. (FAULTY SOLENOID)

I.Q.

Member
EDIT: Problem solved. The problem was a faulty solenoid. Replacing it with a new solenoid did the trick.

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Hi folks,

SHORT STORY

I've got the TORO Timecutter ZS5000 (not the latest version, some 7 years old). Worked with it on Friday without a problem. Saturday, however, it would not start. Nothing.
The following parts do *not* seem to be causing the problem: the battery; the electronic park break module; the push button brake switches on the levers/arms; (the security seat switch is not involved in the starting, only when the PTO is engaged); the fuses; the starter; the PTO switch; the ignition/keyswitch; the engine itself.

That leaves me with the solenoid, and the wiring between the ignition/keyswitch and the solenoid. (Am I missing something?).

I don't quite understand why I do hear a click in the solenoid (which suggests that it works, although the click really is not very loud), but cannot measure any significant voltage coming from the ignition to the solenoid (I measured 0.01V at one point). If I hear the click, that should mean that electricity comes through to the solenoid, right? EDIT: I was measuring the wrong post (the one with the green wire). When measuring the post with the blue wire, it does give 12V, and the blue wire is the one between the solenoid and the keyswitch, not the green wire. I think I mixed them up because in some youtube movies, the solenoid is set up exactly the other way around, and I was not paying attention to the colour of the wires.

Anyway, none of the posts that are on the starter unit side of the solenoid give 12V when the ignition key is in the START-position. This is not good.

How can I be sure it is the solenoid that needs replacing? How can I test if it is a broken wire problem?

Any help and suggestions are appreciated. Thanks.


LONG STORY

Friday it works without a problem. (Starting it took some time, because I had not used it for a number of months. I had forgotten to disconnect the battery before the inactivity, but had charged the battery beforehand). Saturday, however, it would not start. When I turn the key in the ON position, I hear a soft click coming from the engine. Also, I hear the park break sound when bringing in the arms/levers. That should mean that electronic park break module is functional and that there is juice in the battery. When measured, the battery is 13,8V. (After having had it on a battery charger for a couple of hours. Sunday: down to 12,7V, b.t.w.).

When turning the key from the ON position into the STARTER position, I do hear the click from the solenoid. (The click is not very loud, though. I have heard a louder click of similar solenoids in youtube videos).

However, the signalwire from the keyswitch/ignition to the small LEFT pole (that is: the starter-side of the) solenoid did NOT make my (basic) electricity testing screwdriver light up when trying the starter key (I measured 0.01V with a voltage meter, at one point). As far as I understand, that should light up, because that signalwire should “switch” on the solenoid so that power from the battery is transferred to the starter unit on the engine. So, although I do hear a click in the solenoid suggesting a “switch on” when trying to start it, it does not result in voltage being put through. The pole of the solenoid that is connected to the + pole of the battery does give the same voltage as the battery. The pole on the other side of the solenoid gives 0 Volts no matter what I do. (I might have the function of small poles on each side of the solenoid mixed up/not correct..?)

I checked, cleaned an re-seated the connectors of the keyswitch/ignition and the blade activator/stopper switch (PTO). Made no difference.

I checked the voltage on all poles of the ignition/keyswitch, and in the ON position, all but the pole with the blue wire gave the same voltage as the battery. From looking at a service manual, the blue wire pole is the #1 pole which is the “start” pole. With the keyswitch turned to start, this pole gives the same voltage as the battery.

Checked the two fuses, both still good, both getting the same voltage as battery when ignition in ON position.

I re-seated the electronic park break module plug (as I read this solved the no starting issue for someone. Alas, not for me).

I can start the engine by shorting the solenoid poles with a screwdriver. So, the starter unit is still good.

I'm starting to think that maybe the solenoid is not functioning properly and/or there is something wrong with the wiring coming from the ignition going to the solenoid (through the electric break system, right?).

The following parts do *not* seem to be causing the problem: the battery; the electronic park break module; the push button brake switches on the levers/arms; (the security seat switch is not involved in the starting, only when the PTO is engaged); the fuses; the starter; the PTO switch; the ignition/keyswitch.

That leaves me with the solenoid, and the wiring between the ignition/keyswitch and the solenoid. (Am I missing something?).
I don't quite understand why I do hear a click in the solenoid (which suggests that it works), but cannot measure any significant voltage coming from the ignition to the solenoid (I measured 0.01V at one point). If I hear the click, that should mean that electricity comes through to the solenoid, right? EDIT: I was measuring the wrong post (the one with the green wire). When measuring the post with the blue wire, it does give 12V, and the blue wire is the one between the solenoid and the keyswitch, not the green wire. I think I mixed them up because in some youtube movies, the solenoid is set up exactly the other way around, and I was not paying attention to the colour of the wires.

Anyway, none of the posts that are on the starter unit side of the solenoid give 12V when the ignition key is in the START-position. This is not good.

How can I be sure it is the solenoid that needs replacing? How can I test if it is a wire problem?

Any help and suggestions are appreciated. Thanks.


I.Q.
 
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The user manual says: modelnr 74661. I'm going to see if I can find the serial number tag on the Toro itself.

Edit: confirmed on the sticker on the Toro itself, as well.
 
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wires at solenoid toro.JPG

Here is an image of the wire configuration of the solenoid. The right side is the battery side, the lefts side is the engine starter side.

An earlier youtube video gave me the impression that the green wires are the wires between the ignition switch and the solenoid (hence my confusion about this, in my original post), but watching another video yesterday evening (www.youtube.com/watch?v=LLSBif6jgew) explained that it is the blue wire(s) that comes from the ignition switch. And with the ignition switch turned to ON, it should give the same voltage as the battery, which it does (although not exactly the same, it is a little bit less..).

Now, according to this latest video, with the ignition switch turned to "start", the little ground pole with the green wires should also start giving the same voltage output as the battery. This it does not do with my solenoid, it gives 0.12V instead of 12.something Volt. Since this green wire(s) come from the electronic brake unit, I'm not sure if I can conclude that the solenoid is no longer functioning properly (even though a click can be heard from it), or that the electronic brake unit might (also?) be involved in causing the problem (even though the brakes engage and disengage as and when they should..).
 
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Wiring schematic is in the back of the owner manuals. It would take me a while to label Voltage checks on the schematic. But I out of the office most of today.

Basically to start the following wires at the controller must have 12V.

Gray, both Tan, Pink, and Blue wires.
Gray wire is controlled by the PTO and the switch must be off.
Brown wire can have 12v or not depending if you are on the seat or not.
Green wire is grounded thru the controller.
One Tan wire is from the lap bar switches in neutral position.
The other Tan wire is for the carb fuel solenoid.

Now the connector at controller is suppose to be water resistant but I have several that water got in there anyways. This will short out the controller or corrode things to not work. In nearly every case I had to replace the controller, the terminals, and connector housing. But for the new controller to be warrantied Toro requires the wire harness to be replaced as most of us don't have necessary terminals and housing or the proper terminal crimper.

Just be aware that even when I replaced the harness and controller, one time the controller shorted out while sitting on equipment yard. I heard the brakes cycling and before I could disconnect the battery magic smoke was released. So I recommend replacing the harness as required for warranty purposes.
 
Thanks for the reply, ST!

the following wires at the controller must have 12V

To what are you referring to with 'the controller'? I assume the electronic park break module, but I'd like to be sure before checking the voltage in the plug/connector.
 
Thanks for the reply, ST!



To what are you referring to with 'the controller'? I assume the electronic park break module, but I'd like to be sure before checking the voltage in the plug/connector.
Yes it is what they are they are now calling Brake Box assembly ie what you are calling the park brake module. To me it is Electronic Controller Unit since all the safeties are fed thru it.

On the schematic they are labeling it Brake Actuator.
 
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Clean the battery terminals then check the battery voltage WHILE YOU ARE TRYING TO START IT. It might read 12+V sitting then drop to 3 or 4 when you are trying to start it.
 
Clean the battery terminals then check the battery voltage WHILE YOU ARE TRYING TO START IT. It might read 12+V sitting then drop to 3 or 4 when you are trying to start it.
Thanks for the extra info on that. I checked it as suggested..battery stays 12V. So, the battery is not the problem, for sure, now.
 
Another way to test is to jump the 12v across to the starter and see if it engages. You can also jump the solenoid energize post to the 12V of the battery and see if the behavior is the same as when you turn the key.

next conventional test would be to test voltage between the the solenoid energize wire and ground when you turn the key. It should be the same 12V. If not then the problem is between the battery and that point, if it is Ok go to the next step

Next step, test the voltage at the starter post of the solenoid and ground when you turn the key. If 12V then go to next step. If not the solenoid is suspect

Next step, test the voltage right at the starter post when you turn the key. It should be the same as the prior test. If not check the cable and the connections.

If yes, then check the voltage between the starter housing and the battery ground when you turn the key. It should be close to zero. If it is higher, like 12V then the starter ground is bad somewhere between the battery negative and the starter housing. If you get 12V at the starter when the key is turned and zero on the case then the starter is bad.
 
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