M30 engine ECU learning

[Annddrriy]

I am trying to check TPS from the German language I did translate to English and the german ETM written The voltage decreases as the throttle valve opens. Another information from the same ETM If you now slowly open the throttle valve the value must change from 1.0 KOhm to 4.0 KOhm. How if it should be wiring connected in TPS when throttle plate open it should voltage decrease or increase. If wiring backward then voltage could decrease and vice versa ? Thanks in advance for your answer !

[shogun]

E32 Bentley Repair manual page 130-16 and 130-17 mentions

Throttle position switch (TPS), testing and adjusting (M30 engine w/o EML). On the M30 engine without EML (electronic throttle control), a throttle position switch (TPS) provides an idle and full throttle position signal to the ECM. The idle position signal is used mainly for activation of the idle speed control valve. The full throttle position signal is used for A/C compressor cutout and fuel enrichment. The TPS is mounted to the side of the throttle housing. The switch can be checked with the throttle housing installed. NOTE:On 735i/iL (M30 engine) with traction control (ASC), the EML control module provides the throttle position signal to the ECM.
Disconnect harness connector (arrow) from throttle switch. With ignition on, check for supply voltage (VDC) to switch, If voltage is not present, check wiring from ECM.
TPS test terminals (M30 engine)
• Manual transmission
Idle position.......................................... ......... 2 and 18
Full throttle position........................... ..............3 and 18
• Automatic transmission
Idle position........................... ............ 4 and 6
Full throttle position............................. 4 and 5

— Check for continuity at switch terminals with throttle at idle and at full open positions. Adjust or replace switch if any faults are found.
— To adjust throttle switch, loosen switch screws and connect an ohmmeter across switch terminals. With throttle at idle, rotate switch just until there is continuity. Tighten mounting screws. Seal mounting screws using paint or lacquer.

Throttle-position-switch-dis-assembly-Testing-technical-data https://www.bimmerforums.com/forum/s...1#post30796741

[Annddrriy]

The Motronic sends a voltage signal to the potentiometer which is two wiper track and measures the returned voltage. The voltage decreases as the throttle valve opens the signal is send to the automatic transmission TCU not the engine ECU.

[Annddrriy]

What ECM module can provide the throttle position signal to the engine ECM ? In vehicle with EML module the throttle position signal received from the EML module and the throttle position switch could provide signal to the engine ECU in vehicle without EML module.

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Idle 4 to 6 cannot make a potentiometer signal to the engine ECU because it’s on/off switch but ETM written voltage decreases as the throttle valve opens. Another information from the same ETM If you now slowly open the throttle valve the value must change from 1.0 KOhm to 4.0 KOhm.

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The potentiometer is attached to the right side of the throttle valve and cannot be adjusted. The Motronic sends a voltage signal to the potentiometer and measures the returned voltage. The voltage decreases as the throttle valve opens.
The potentiometer is located on the right side of the throttle valve and is not adjustable. The DME sends a signal to the potentiometer and measures the returned voltage. Voltage goes down/smaller when the throttle valve opens.

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If I install hydraulic only automatic transmission without the TCM ? Should I install TPS 3 wires only with potentiometer ?

[Annddrriy]

Forum E9coup.com. Does he need to install a special jumper from the automatic part of the harness to the 179 ECU to get it to work properly? #1 yes #2 no #3 no

[Annddrriy]

To run automatic transmission right I have to try wired same as in 750iL automatic transmission TCM pins 7 and 9 not connected. That is E9 version of the valve body without adaptive automatic transmission. Have a look on this automatic transmission TCM how it is wired.
IMG_0349.jpg

[Annddrriy]

The TPS for manual transmission is quite simple it has one pin ground and one pin power supply and one pin signal return to the engine ECU. I was thinking about the TPS has potentiometer for the engine ECU.

[Annddrriy]

if you wired TPS potentiometer to the engine ECU pins 52 idle and pin 53 wide open throttle then other three wires of the TPS should work as on/off switch to the automatic transmission. The automatic transmission TCM pins 9 will receive power from the TPS pin 6 it's idle contact is closed and the automatic transmission TCM pin 7 will be return signal from the TPS pin 5 and the automatic transmission TCM pin 6 is ground will be with ground of the TPS pin 4.

[Annddrriy]

IMG_0376.jpegAnyone can help me out how to check capacitors with oscilloscope ? To determine the capacitance we will measure the time that it charges to a specific voltage. Using a simple circuit where a capacitor is in series with a resistor we can slowly charge a capacitor and measure the voltage across it using an oscilloscope.

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I would like to check out the capacitor which is located on the engine ECU pin 3 ? Thanks in advance for your answer!

[Annddrriy]

I think this capacitor is important for fuel pump. I found in Motronic 1.1 few diodes was open circuit in both ways but the engine was still running on that ECU with bad diodes. I don’t remember what the ECU pin was related to. I will check that and let you know.

[Annddrriy]

Is it good to check 1000 microfarads and 16 volts capacitors by setting digital multimeters scale on 2000 ohms ? The digital multimeter doesn’t have 1000 ohms and doesn’t have 500 ohms ? It has 200 ohms and 20M and 2M and 2.000 ohms 20.000 ohms. What would you advise for scale setting ? I will set scale to 2Mohms. Thanks in advance for your advice !
IMG_0382.jpeg

[Annddrriy]

2000ohms should be ok ?

[savvamatveev]

Hi everyone. Is there a difference between m30b30 and m30b35 ECUs? My car had an m30b30EML from the factory, but due to spun bearings I’ve swapped a used m30b35 block. Everything except the block itself is from my original engine (throttle body, injectors, MAF, etc). Engine seems to work a little rich and I was wondering if I could remap it or change a chip, or do I need to change the whole ECU to an m30b35EML one?

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Also if I floor it sometimes it goes in to a limp mode and an EML light turns on. The car is manual with traction control. I really want to get rid of these gremlins. Hoping for your help.

[shogun]

original in Europe: 0261200151 M1.1 M30B30 , 0261200150 M1.1 M30B35 ; 0261200178 M1.3 M30B30 , 0261200179 M1.3 M30B35 . if you only changed the block, the ECU should work, the main difference in engine volume should be adjusted by the ECU, so when the engine works rich, the O2 sensors should report that to the ECU and that should make the adjustments in the intake system.
comment on the German forum: Die beiden Steuergeräte sind zu 100% zueinander kompatibel. Zu Testzwecken kann man auch das Steuergerät vom M30B30 im M30B35 und umgekehrt verwenden. Der Unterschied besteht im wesentlichen in der Hardware. Die Motronic mit der Endnummer 150 ist eine Motronic 1.1. Das Steuergerät besteht aus zwei Platinen und man hat nicht die Möglichkeit per Blinkcode über die Check Engine Lampe (nicht im Instrumentenkombi bestückt!), Fehler auszulesen. Das Steuergerät mit der Endnummer 179 ist die Motronic 1.3. Das ist die modernere. In dem Steuergerät ist alles auf einer Platine untergebracht, des weiteren hat es ein überarbeitetes Kennfeld. Auch kann man mit der 1.3 Motronic bei bestückter Check Engine Lampe im Instrumentenkombi, Fehler per Blinkcode auslesen.
translated: The two control units are 100% compatible with each other. For test purposes, you can also use the control unit from the M30B30 in the M30B35 and vice versa. The main difference is in the hardware. The Motronic with the end number 150 is a Motronic 1.1. The control unit consists of two circuit boards and it is not possible to read out errors via the Check Engine lamp (not fitted in the instrument cluster!) using a blink code. The control unit with the final number 179 is the Motronic 1.3, which is the more modern one. In the control unit, everything is housed on one circuit board, and it also has a revised map. With the 1.3 Motronic, it is also possible to read out errors via a flashing code when the check engine lamp in the instrument cluster is fitted.

If EML light sometimes goes on when you floor it, read out the fault codes.

Info von Pelican Parts for US versions:

730i E32 M30/B30 89-92 0 261 200 178 Bosch Motronic M1.3
735i/iL E32 M30/B35 86-88 0 261 200 150 Bosch Motronic M1.1
735i/iL E32 M30/B35 (211hp) 89-92 0 261 200 179 Bosch Motronic M1.3
740i/iL E32 M60/B40 9/92-4/940 261 200 404 Bosch Motronic M3.3
750iL E32 M70/B50 88-90 0 261 200 156Bosch Motronic M1.2
750iL E32 M70/B50 91--> 0 261 200 352 Bosch Motronic M1.7

840i E31 M60/B40 9/93-12/94 0 261 200 404 Bosch Motronic M3.3
840i E31 M60/B40 1/95--> 0 261 203 484 Bosch Motronic M3.3 w/ EWS-II
840i E31 M62/B44 96--> 0 261 203 474 Bosch Motronic M5.2 (OBD-II)
850i E31 M70/B50 91--> 0 261 200 352 Bosch Motronic M1.7

520i E34 M20/B20 (129hp) 87-90 0 261 200 172 Bosch Motronic M1.3
525i E34 M20/B25 87-90 0 261 200 173 Bosch Motronic M1.3
525i E34 M20/B25 87-90 0 261 200 524Bosch Motronic M1.3
525i E34 M50/B25 thru 8/91 0 261 200 405 Bosch Motronic M3.1
525i/iT E34 M50/B25 9/91-1/92 0 261 200 403 Bosch Motronic M3.1
525i/iT E34 M50/B25 2/92-93 0 261 200 402 Bosch Motronic M3.1
525i/iT E34 M50tu/B25 93-12/94 0 261 200 413 Bosch Motronic M3.3.1
525i/iT E34 M50tu/B25 1/95--> 0 261 200 413 Bosch M3.3.1 with EWS-II
535i E34 M30/B35 89-92 0 261 200 179 Bosch Motronic M1.3
530i E34 M60/B30 3/93-8/94 0 261 200 404 Bosch Motronic M3.3
530i E34 M60/B30 9/94-12/94 0 261 200 404 Bosch M3.3 w/ air pump
530i E34 M60/B30 1/95-4/94 0 261 203 484 Bosch M3.3 w/ EWS-II
540i E34 M60/B40 thru 12/94 0 261 200 404 Bosch Motronic M3.3
540i E34 M60/B40 1/95--> 0 261 203 484 Bosch Motronic M3.3 w/ EWS-II
M5 E34 S38/B36 (315hp) 91--> 0 261 200 350 Bosch Motronic M1.2
Alpina B10 Biturbo E34 M30 (360hp) 89-94 0 261 200 079 M1.1

[Annddrriy]

The control unit with the final number 179 is the Motronic 1.3, which is the more modern one but the chip could be for manual transmission and could cause the engine ECU stored the code 54.