Bosch ETB Wiring Question

[chris023]

Specific TPS/APS Applications > Bosch

Bosch

Bosch PN 0 280 750 473  Electronic Throttle Body (82mm bore) & Bosch PN 0 280 750 150 Electronic Throttle Body

 

I am looking at this help article and want to verify that I am wiring this to the ECU correctly.

Based on this pinout would these values be correct?

Electronic Throttle Body
Pin 1 - Aux 9
Pin 2 - ECU Gnd Output
Pin 3 - ECU 5v Output
Pin 4 - Aux 10
Pin 5 - ANVolt7
Pin 6 - AnVolt12

Additionally I also have my gas pedal wired up to:
APS (Main) - ANVolt8
APS (Sub) - ANVolt9

 

Are these wiring values correct? Thanks!

[Adamw]

Yep all looks fine.  I would just swap aux 9 & 10, it will work fine as is since you can reverse the control logic in G4X, it has always been links convention to have aux 9 connected to motor +ve.  
And yes “sensor ground” is labeled “ground out” in some of our pinouts (green wire in link looms).

[chris023]

Thanks @Adamw! I think the answer is yes but just want to confirm here as well -- Is the aux out enough to power the ETB without a relay?

[Adamw]

The motor will be connected direct to the aux, but you still need the E-throttle relay on the aux9/10 supply so the ecu can cut power to throttle if there is a safety issue.  

[chris023]

I had my NS15X ECU sent to your main office in NZ to have the e-throttle added.  My understanding is that this means I do not need the external e-throttle relay you're mentioning here? The ECU I received had the 4 cables Aux9,10 and AnVolt7,12 coming out of the ecu board with a small bit of clear glue on the circuit board where the wires are attached.

17 hours ago, Adamw said:

The motor will be connected direct to the aux, but you still need the E-throttle relay on the aux9/10 supply so the ecu can cut power to throttle if there is a safety issue.  

[Adamw]

Correct, you will not need the relay in your case.

[chris023]

@Adamw What value do I set for "E-throttle relay 1" in this case? When attempting to run the TPS calibration I get "Error 1: E-throttle relay NOT selected."

[Adamw]

Set to aux 16.

[chris023]

44 minutes ago, Adamw said:

Set to aux 16.

Thanks! I was able to run the TPS calibration now and have it succeed. I did need to reverse the active state on Aux 9 from Low to High. 

I left the default values for these:
- PWM Frequency
- Proportional Gain
- Integral Gain
- Derivative Gain

When I attempted to use the suggested values in the help article and calibrate, I got an error that the throttle plate did not move.  However I hear an audible hum coming from the throttle body when it is on that makes me think these values need to be adjusted.  This is the specific throttle body I have installed: https://www.summitracing.com/parts/BCH-0280750151#overview.

Do you have any suggestions?

 

in
-

[Adamw]

Its not going to work well at 100Hz.  Really want at least 500Hz.  

Can you set the PID recorder to E-throttle 1 as per pic below and do me a log using the settings shown in the help file.  I would expect your throttle probably shares many parts with the part numbers we have tested so I would think the settings wouldnt be too far off. 

[chris023]

I'm new to this software so not sure if I logged it correctly. I set the values to the ones in the help article and ran a calibration.  I get an error something like "Error 5: no main movement" when trying to use those PID settings.  I took two logs each contains a unique calibration with the same result.

PC Datalog - 2022-09-18 6;59;47 pm.llgx PC Datalog - 2022-09-18 6;57;18 pm.llgx

[Adamw]

Can you attach a copy of the map that was in the ecu when you done these logs. 

[chris023]

Yup! Here you go @Adamw

9.18.22 map.pclx

[Adamw]

Can you set the max clamp to 100% and try again.

 

[chris023]

43 minutes ago, Adamw said:

Can you set the max clamp to 100% and try again.

 

Was able to get the calibration to succeed with that.  Still quite a bit of noise coming from the throttle body when e-throttle is not in the disabled state.  It sounds like a buzz or hum coming from the throttle body.  The pitch of the hum  changes with the PWM frequency, it is a much higher noise at 10k than it was at 100.  Attached is the new calibration.

Any suggestions to eliminate the hum?

PC Datalog - 2022-09-18 9;26;25 pm.llgx

[Adamw]

The hum or whine is normal.  Set it to quiet throttle if it bothers you.  

[chris023]

1 hour ago, Adamw said:

The hum or whine is normal.  Set it to quiet throttle if it bothers you.  

Will do.  Can you give me more insight into what the min/max clamp value does? I have read other suggestions to set the max open/close values to 98% so the motor is not struggling to keep the plate near the end of its maximum ranges.  Would this correlate to 98% min/max clamp values? I also saw for example that the GM throttle body it is recommended to set the clamp to 90%.  The bosch wiki doesn't have recommended values for this.

Thanks so much for your help today -- Just a hobbyist mechanic so doing my best to keep up here!