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CBR600RR 04 - Need some help

211 Views 8 Replies 3 Participants Last post by  proj600rr, 
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HI guys,

I need some help to find an issue with my cbr600rr 2004, 60k miles. I am out of idea and thninking that it might be the ECM that is faulty.

When cold, the bike feels like it hits a limitator very low in rpm. While heating up, the rpm climb up a little more but still hesitates as you will see in the video linked below. Once under load, it will jerk randomly troughout the rpm wether the engine is cold or not.

Here what I have done to the bike so far:

oem spark plugs, new air filter, oil and filter change
tested rectifier and stator : within manual specs
checked for loose grounds
NO FI light stored in ECM
OEM exhaust and no Power commander
New battery
Fuel pump tested for flow and exceeds specs in manual

Link for video : May 18, 2023 - YouTube

Thank you!
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D
What numbers did you measure for flow-test?
Did you do pressure-test?


Measure vacuum in MAP-sensor line. Might have leak which throws off ECU's load-calculations.

Do MAP-sensor circuit tests from manual.
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dannoxyz said:
What numbers did you measure for flow-test?
Did you do pressure-test?


Measure vacuum in MAP-sensor line. Might have leak which throws off ECU's load-calculations.

Do MAP-sensor circuit tests from manual.
Click to expand...
It has pumped around 250 ml for 10 seconds.
I did not pressure test it. I would have to buy myself a kit.

I will run circuit tests on map sensor as per the manual. I remember having it disconnected and the bike ran the same, except with a 1 blink FI light stored in the ecm. I will measure vaccum in map sensor line as well. Thanks for your help!
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If it ran same with and without MAP-sensor vacuum-hose connected, then something is definitely wrong with MAP-sensor or its wiring.

Use vacuum-T with gauge and measure vacuum at idle and 4000rpms in neutral.

Also measure MAP-sensor voltage output at those as well. Manual's very vague about actual numbers, but they have to be within correct range for ECU to make proper load calculations.
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dannoxyz said:
If it ran same with and without MAP-sensor vacuum-hose connected, then something is definitely wrong with MAP-sensor or its wiring.

Use vacuum-T with gauge and measure vacuum at idle and 4000rpms in neutral.

Also measure MAP-sensor voltage output at those as well. Manual's very vague about actual numbers, but they have to be within correct range for ECU to make proper load calculations.
Click to expand...
It was only with the connector unplugged , vaccum hose was still attached
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Hmm, would still be major problem with MAP sensor unplugged. Then you would get error code with it unplugged?
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Yes it is the same problem with map sensor unplugged, it throws a code instantly
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NewRedRider
You're going to need that pressure gauge kit now and in the future. Either rent one for now or just buy one to keep. You're going to have to test the fuel pressure at some point in the future just because of the nature of the non-serviceable final fuel filter. You'll need to make sure it doesn't starve the motor of fuel.
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While in diagnostic mode ( jump the red diagnostic connector, engine not running), FI light and oil pressure light stay lit up as long as the ignition is turned on. Based on the manual, it would be a faulty ecm or bad diagnostic circuit. Any thought on that? Thanks again!
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