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Discussion Starter #1
Hello everyone,

I recently bought 2008 cbr600rr and the tachometer doesnt work. While the needle goes all the way up and back to zero when you turn the ignition on but if you rev the bike the needle doesnt move a bit. Also the temperature guage shows two dashed lines. Everything else on the cluster work. The speedometer works as well. The person i bought the bike from told me that i need to replace the fan relay and that should fix the problem. Do i really need a fan relay?

Any help will be appreciated
 

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no you don't need a fan relay. that has nothing to do with the dash whatsoever.



you should look for corrosion or poor connections in the harnesses leading to the dash. the tach and ECT sensor are unrelated, so it's not likely to be a single issue causing both symptoms.
 

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Check all your connections, something is simply not plugged in.
 

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Does your fan come on? If so, your ect sensor is probably working and your fan relay is ok too.

Which means the wiring going from the ECU to the cluster is dodgy. Both the tach and temp signal is wired from the ECU.

Get yourself a wiring diagram and multimeter to check the connections.
 

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Discussion Starter #6
Yes, the fan always stays on. When i turn in the ignition key the fan is already kicking in.

So i looked at the wiring diagram, if i am reading it correctly, the wiring for tachometer goes into the ECT sensor and the temperature gauge goes in the ECU. How do i check the connections with multimeter ?

Sorry i am not mechanically inclined
 

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Yes, the fan always stays on. When i turn in the ignition key the fan is already kicking in.

So i looked at the wiring diagram, if i am reading it correctly, the wiring for tachometer goes into the ECT sensor and the temperature gauge goes in the ECU. How do i check the connections with multimeter ?

Sorry i am not mechanically inclined
That is definitely not right. The fan should only come on when the coolant temperature is about 103 Celsius.

Either there's some short circuit that's permanently engaging the fan relay or someone's done some dodgy wiring to compensate for the faulty coolant temperature reading.

The wiring for the tacho should go to the ECU not the ECT sensor.

1) Disconnect your battery (very important!!)
2) disconnect your cluster connector and ECU connectors.
3) put the multimeter in continuity buzz mode and probe from the relevant pin on the cluster side to the ecu side

E.g. if the tacho signal was pin 6 on the cluster and pin 36 on the ecu, you should probe those two pins. If the wiring is good, the multimeter will buzz and indicate a resistance of 1 ohm or less.

If the wiring is faulty it may indicate a higher resistance or complete open circuit with no buzzing.

To probe those type of connectors you may need to get some automotive type probes or use some connector wire. Ensure you get the right pins and in case of the ECU, the right connector as well or you may be chasing a problem that doesnt exist.

I dont have the schematics handy to tell you the pins/wire colour.
 

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Discussion Starter #8
That is definitely not right. The fan should only come on when the coolant temperature is about 103 Celsius.

Either there's some short circuit that's permanently engaging the fan relay or someone's done some dodgy wiring to compensate for the faulty coolant temperature reading.

The wiring for the tacho should go to the ECU not the ECT sensor.

1) Disconnect your battery (very important!!)
2) disconnect your cluster connector and ECU connectors.
3) put the multimeter in continuity buzz mode and probe from the relevant pin on the cluster side to the ecu side

E.g. if the tacho signal was pin 6 on the cluster and pin 36 on the ecu, you should probe those two pins. If the wiring is good, the multimeter will buzz and indicate a resistance of 1 ohm or less.

If the wiring is faulty it may indicate a higher resistance or complete open circuit with no buzzing.

To probe those type of connectors you may need to get some automotive type probes or use some connector wire. Ensure you get the right pins and in case of the ECU, the right connector as well or you may be chasing a problem that doesnt exist.

I dont have the schematics handy to tell you the pins/wire colour.

The guy whom i bought the bike from told me that I need a fan relay. That is why the fan is kicking in all the time. Could that be it ?
 

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i doubt it. relays are very dependable devices. taking guesses and spending money won't fix your bike.


there may be some circuit trouble that's causing the fan call to be present all the time.


my suspicion is there is harness damage. lift the tank and have a look, something may be pinched.
 

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Discussion Starter #11
Thanks for ya'lls input. I'll open up the gas tank this weekend (probably post pictures too) and give an update.
 

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Discussion Starter #12
Sorry for the late response. I have been out of country for a while and recently wrecked my "new" motorcycle. So i haven't got the chance to work on my issue until today. Upon checking up the wiring harness, I found two of the wires broken. Having fixed that solved my issue of tachometer and missing temperature gauge.

Thank you everyone for your help
 

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