TPS or not ?

My bike has had some really strange symptoms lately. I've read the symptoms of a bad TPS but they aren't *quite* like that.

The bike will occasionally hesitate. That is, I'll be cruising along and it will suddenly act as though I cut the throttle a little. It will do this for a few seconds and then go back to normal. A few miles later it will do it again.

Once it gets into this state, it idles really high, sometimes 3000 RPM.

When I shut off the engine, it will occasionally flash "Err2_3" but its so fast that I may have got the numbers wrong.

If I do a TPS diagnostic, it is always fine: 16-100.

When I turn the bike back on and start it, it will start idling normally again.

It sounds like something electrical to me rather than a bad TPS but what do I know. Any one have an idea ?

Sounds possible - I'd call your dealer and verify whether or not your bike was affected by the TPS recall and if so whether or not it was performed. You can read more here:

http://www.600riders.com/forum/fz6-technical/181-throttle-position-sensor-issues-you-experiencing-poor-idle-mileage-stalls.html

FWIW - I didn't think I had any symptons before mine went really bad so ensuring that it is done is prudent either way.

I had the TPS replaced under recall a year or two ago, however its my understanding that they don't last forever. Some bikes have had multiple TPS', etc.

Since the problem goes away (for a while) after power-cycling the bike, I have a hard time believing that the problem is a varistor.

If you turn the key off, it "resets everything" and your TPS would show up normal. To test it, shut it off with the kill switch, and don't touch the key.

keraba said:

My bike has had some really strange symptoms lately. I've read the symptoms of a bad TPS but they aren't *quite* like that.

The bike will occasionally hesitate. That is, I'll be cruising along and it will suddenly act as though I cut the throttle a little. It will do this for a few seconds and then go back to normal. A few miles later it will do it again.

Once it gets into this state, it idles really high, sometimes 3000 RPM.

When I shut off the engine, it will occasionally flash \"Err2_3\" but its so fast that I may have got the numbers wrong.

If I do a TPS diagnostic, it is always fine: 16-100.

When I turn the bike back on and start it, it will start idling normally again.

It sounds like something electrical to me rather than a bad TPS but what do I know. Any one have an idea ?

Click to expand...

I just had the TPS replaced on my 05 yesterday. They also had to replace some washer on the front sproket. It didn't cost me a dime. The bike seems run a little smoother. It only took them 1 1/2 hours to do the work. You should get the recall taken care of.

I'd push to have it changed. Its a true safety issue and could cause a wreck. Fromt eh hesitation part, it could also be a spark plug or plug wire issue but again, the TPS is a recall and a safety issue if you needed to throttle up to avoid a collision and the bike hesitates or stalls.

Here are the Definition of the Fault Codes listed in the FZ6 Service Manual:


Fault Code: 12
Diagnostic Code: --
Symptom: No normal signals are received from the crankshaft position sensor.
Probable cause of malfunction:
Open or short circuit in wiring harness.
Defective crankshaft position sensor.
Malfunction in pickup rotor.
Malfunction in ECU.
Improperly installed sensor.

Fault Code: 13
Diagnostic Code: 03
Symptom: Intake air pressure sensor-open or short circuit detected.
Probable cause of malfunction:
Open or short circuit in wiring sub lead.
Open or short circuit in wiring harness.
Defective intake air pressure sensor.
Malfunction in ECU.

Fault Code: 14
Diagnostic Code: 03
Symptom: Faulty intake air pressure sensor pipe system
Probable cause of malfunction:
detected hose
clogged hose
Intake air pressure sensor hose is detached, clogged,
kinked, or pinched.
Malfunction in ECU.

Fault Code: 15
Diagnostic Code: 01
Symptom: Throttle position sensor-open or short circuit detected.
Probable cause of malfunction:
Open or short circuit in wiring sub lead.
Open or short circuit in wiring harness.
Defective throttle position sensor.
Malfunction in ECU.
Improperly installed throttle position sensor.

Fault Code: 16
Diagnostic Code: 01
Symptom: A stuck throttle position sensor is detected.
Probable cause of malfunction:
Stuck throttle position sensor.
Malfunction in ECU. 01

Fault Code: 19
Diagnostic Code: 20
Symptom: Open circuit in the input line of ECU No4 terminal is detected when the start switch is pressed.
Probable cause of malfunction:
Open circuit in wiring harness (ECU coupler).
Malfunction in ECU.

Fault Code: 21
Diagnostic Code: 06
Symptom: Coolant temperature sensor-open or short circuit detected.
Probable cause of malfunction:
Open or short circuit in wiring harness.
Defective coolant temperature sensor.
Malfunction in ECU.
Improperly installed sensor.

Fault Code: 22
Diagnostic Code: 05
Symptom: Intake air temperature sensor-open or short circuit detected.
Probable cause of malfunction:
Open or short circuit in wiring harness.
Defective intake temperature sensor.
Malfunction in ECU.
Improperly installed sensor.

Fault Code: 30
Diagnostic Code: 08
Symptom: The motorcycle has overturned.
Probable cause of malfunction:
Overturned.
Malfunction in ECU.

Fault Code: 33
Diagnostic Code: 30
Symptom: Open circuit is detected in the primary lead of the ignition coil (# 1, #4).
Probable cause of malfunction:
Open circuit in wiring harness.
Malfunction in ignition coil.
Malfunction in ECU.
Malfunction in a component of ignition cut-off circuit system.

Fault Code: 34
Diagnostic Code: 31
Symptom: Open circuit is detected in the primary lead of the ignition coil (# 2, #3).
Probable cause of malfunction:
Open circuit in wiring harness.
Malfunction in ignition coil.
Malfunction in ECU.
Malfunction in a component of ignition cut-off circuit system.

Fault Code: 41
Diagnostic Code: 08
Symptom: Lean angle cut-off switch-open or short circuit detected.
Probable cause of malfunction:
Open or short circuit in wiring harness.
Defective lean angle cut-off switch.
Malfunction in ECU.
Fault Code: 42
Diagnostic Code: 07, 21
Symptom: No normal signals are received from the speed sensor; or, an open or
short circuit is detected in the neutral switch.
Probable cause of malfunction:
Open or short circuit in wiring harness.
Defective speed sensor.
Malfunction in vehicle speed sensor detected unit.
Defective neutral switch.
Malfunction in the engine side of the neutral switch.
Malfunction in ECU.

Fault Code: 43
Diagnostic Code: 09
Symptom: Supply power to the injector and fuel pump is not normal
Probable cause of malfunction:
Open circuit in wiring harness. (red/blue line or blue/yellow line)
Malfunction in ECU.

Fault Code: 44
Diagnostic Code: 60
Symptom: An error is detected while reading or writing on EEPROM.
Probable cause of malfunction:
Malfunction in ECU. (The CO adjustment value is not properly written on or read from the internal memory).

Fault Code: 46
Diagnostic Code: --
Symptom: Power supply to the FI system is not normal.
Probable cause of malfunction:
Malfunction in "CHARGING SYSTEM".

Fault code: 50
Diagnostic Code: --
Symptom: Faulty ECU memory. When this malfunction is detected, the code
number might not appear on the meter.
Probable cause of malfunction:
Malfunction in ECU. (The program and data are not
properly written on or read from the internal memory.)

Fault code: Er-1
Diagnostic Code: --
Symptom: No signals are received from the ECU.
Probable cause of malfunction:
Open or short circuit in wiring sub lead.
Malfunction in meter.
Malfunction in ECU.

Fault code: Er-2
Diagnostic Code: --
Symptom: No signals are received from the ECU within the specified duration.
Probable cause of malfunction:
Improper connection in wiring sub lead.
Malfunction in meter.
Malfunction in ECU.

Fault code: Er-3
Diagnostic Code: --
Symptom: Data from the ECU cannot be received correctly.
Probable cause of malfunction:
Improper connection in wiring sub lead.
Malfunction in meter.
Malfunction in ECU.

Fault code: Er-4
Diagnostic Code: --
Symptom: Non-registered data has been received from the meter.
Probable cause of malfunction:
Improper connection in wiring sub lead.
Malfunction in meter.
Malfunction in ECU.