M104 2.8 HFM hesitating/rpm down and up while coming to a stop - Page 2 - Mercedes-Benz Forum
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post #11 of 57 (permalink) Old 07-24-2015, 07:23 AM Thread Starter
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I've checked the PDF, ok so you think there could be a problem with the starter lockout switch (S16/3)?

This is what it says:
Quote:
The starter lockout switch (S16/3) is used for recognizing selector lever positions P/N and also 2/3 for the HFM control unit.
The selector lever position is required in the HFM control unit for the following functions:
D Fuel injection
- Post-start enrichment
D Catalytic converter heating
D Transmission shiftpoint retard
D Camshaft adjustment
D Governing maximum engine speed
Let's say it is this, would this be a simple fix, as in replace sensor/switch? Is this testable?
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post #12 of 57 (permalink) Old 07-24-2015, 07:38 AM
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You do not need to hurry. If your engine was idling RPM 700 (or 600) always (in any position of the selector lever) it would be possible to blame the selector. But you idle speed does not correspond to any standards. I recommend you buy the equipment, do a test, and I'll tell you where you have a problem, I do not like to divine (read fortune)

for example scanner show flags (see picture, first row parameters):
first rectangle:
IDLE - idle speed mode, when IDLE white - throttle is open
second rectangle:
P/N - selector in parking\neutral
Drive - selector in "motion"



when you make diagnose i see the all parameters and may say about problem (often)


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post #13 of 57 (permalink) Old 07-24-2015, 10:46 AM Thread Starter
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I just checked codes:

Pin 8:
None

Pin 14:
Code 5

Did check cold and hot engine idle in D and P/N:

Cold
P:


D:




Hot
P:


D:
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post #14 of 57 (permalink) Old 07-24-2015, 10:47 AM
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I'm thinking eGas module
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post #15 of 57 (permalink) Old 07-24-2015, 09:40 PM
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Hi.
Revs cold P - very high (such normally after starting the engine for 30 seconds, but not for idling).
I think you need to look parameters on module EFP (E-GAS) to understand the reason. But I do not know how to read it (you need to watch it live parameters: signal status S29/3, M16/1s2 and other) ...
Tonight I received vehicle data with the same problem - all parameters for HFM is good, but i see that the throttle is opened strongly, so idling 1000 firing angle -3* (must be +8*), ie, HFM ECU want revs down due to(through) firing angle but can not make them correct.

Code 5 on E-GAS:
Check Stop Lamp switch S9/1 (microswitch brake pedal)


PS: Revs on hot engine slightly above normal (visual), but it's better to control the scanner, because tachometer is not a precision instrument, and I met with a situation where he was lying on a 150 rpm.

Last edited by Mike.K; 07-25-2015 at 12:11 AM.
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post #16 of 57 (permalink) Old 07-25-2015, 05:30 AM
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Am I seeing 10.7 battery volts in that pic? If so, your car is undercharging

Last edited by sbaert; 07-25-2015 at 05:31 AM.
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post #17 of 57 (permalink) Old 07-25-2015, 05:49 AM
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Quote:
Originally Posted by sbaert View Post
Am I seeing 10.7 battery volts in that pic? If so, your car is undercharging

ECU at home (for test adapters)
old computer power supply provides power to the ECU
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post #18 of 57 (permalink) Old 07-28-2015, 12:26 AM Thread Starter
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Guys thanks for the replies and sorry for me not answering, I'm ill at home ((
@Mike.K As for the Cold P revs, it was exactly after I started the car cold, within 5 seconds after starting to be exact
I'm sure I should just get those cables you said, if it won't help it's a nice diagnostic tool anyway so I'll bite the bullet and get that!
@sbaert
I'm gonna do some googling/reading up on eGas module, I'm not sure what that is exactly.

I'm wondering if the loud whirring noise when I start it up (only cold) also has to do with this? Steve already said it's probably a dieing airpump and that I should disconnect the plug to test it. I have had a look but can't find the plug.

I guess I'll let you guys know when I receive the cables and know more about the egas module.
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post #19 of 57 (permalink) Old 07-28-2015, 12:42 AM
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Hi Gripen.
do not be sick
for understanding:
your car has 2 computer that controls the engine
1. ECU HFM - control injector nozzles, spark
2. ECU E-GAS - throttle control, cruise, ASR.

My program hfmscan can read only ECU HFM.
E-GAS computer can not read any free program, only expensive scanners. But, you can find error codes using an LED or my program (I taught her to count blink codes but failed to do the English translation - it will be available in a couple of days on my website)..

when scanning system hfm , we will see the real engine speed (tachometer can distort readings).
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post #20 of 57 (permalink) Old 07-29-2015, 09:34 PM
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Quote:
Originally Posted by Mike.K View Post
I think you have a problem with the signal selector.
M104, the idle speed the engine is warm:
Neutral \ parking = 700 rpm
motion(D) = 600 rpm

The car has cruise control or ASR?

The problem of the selector does not cause errors in the computer.
You can spend 25 EUR to buy an adapter USB KKL+cable W124 and diagnise engine by my test plan

Mike , this is a great info, long time ago I am just dreaming for having this opportunity. Seems need to purchase the cables - but the software also...
The question how to order? software has restriction ( operation system ?)
I use only Macintosh, software available for Mac also?
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