Jrosa55

I inserted the wrong relay in the SAI position while T/S the P410 code. The relay did spark when I did this. Now the ML350 won't crank or start. All fuses are good, replaced the starter relay, disconnected battery for 20 seconds. Tried another key. All the cluster lights work
I can close and remotely lock and close the car. No luck. Immobilizer symptoms. It won't crank with a jumper btw 5 and 3 on the relay box while the key is inserted first so not to activate the immobilizer. Did I blow the ECU?
Help

P0410 OBD-II Trouble Code: Secondary Air Injection System Malfunction

Jrosa55

Update: my code reader is not linking even when the switch is on.

Maj. Dundee

What fuse boxes have you checked and how did you test the fuses?

Jrosa55

I tested all visible fuses in the rear, next to the SAM, Dash and engine compartment. To include the SAM next to the battery. I'm planning on opening that SAM next to the battery and check the internal fuses. I have no comms with the ECU.
I thought I replaced the starter relay. Today I'll replace the correct relay now that I got the correct relay and fuse locations for the W164 variance. I don't think it would help because no comms with the ECU. I really need a electrical wiring diagram bad. Showing the engine fuse / relay box.

I need to find out what fuse I shorted when I mistakenly placed the wrong relay in position G = air suspension compressor. I don't have that option on my vehicle.

Thanks for the response.

Maj. Dundee

Jrosa, I asked one simple question, What fuse boxes have you checked and how did you test the fuses?

I am trying to help you and you didn't answer that question at all. Stop telling me about the wrongly inserted relay and the truck won't start. I know that.

At the Prefuse Box, with the key on, test both contacts at fuse #8 for 12v+.

At the Eng. Comp. Fuse Box, with the key turned to start, (helper needed), test both contacts at fuses 105 & 122 for 12v+.

Jrosa55

I checked the fuses for continuity at the rear, dash and engine compartment. I didn't know there are fuses in the pre fuse box. I'll check those out today. Also, I'll follow your instructions to the T.

Thank you for your services and support ,

JR

Jrosa55

Confirmed 12v at the pre fuse box. No voltages at the engine compartment box fuses 105 and 122. What's next?

JR

Maj. Dundee

Did you check the fuses with the key turned to start?

Did you remove the fuses to see if they were blown?

Please test those fuses with the key on, not start.

Jrosa55

Yeap. Tried it multiple ways. No voltages on those fuses. I'm an engineer with multiple expensive voltmeters. Its tuff to Troubleshoot without a wiring diagram. The horn is not working. Any hints? Fuses are OK like I stated before.

Maj. Dundee

For what reason did you insert the wrong relay?

Is the horn problem because of the wrong insertion or because you were trying to correct the problem?

Jrosa55

read above explanation. Mistake. I mention the horn as another symptom.

Jrosa55

What is btw the pre fuse box and the compartment fuse box.
I order the wiring diagram from Ebay. ETA August 9. In the meantime I have the wife up my butt. Help

full booty Joe

Maj. Dundee

Cancel what you ordered and order Mitchell Diagrams for your veh. You must have a Personal Computer and you can print out every diag. for every system.

http://www.eautorepair.net/Marketing/Default.asp

Jrosa55

Found the problem. I shorted out the engine compartment fuse / relay box. New one fixed my problem.

exhaustgases

So it was just a fuse? Or a messed up box? And what happened to it, short something out and something burns or blows. ?? I'd like more details.

Jrosa55

I shorted the fuse box. Broken solder run inside. I could had solder it back for continuity but just threw it away.

E63sMonster

Need help hav a 2009 ml350 it won’t start
replaced a power steering pump had it parked for 3 weeks after replacing pump went to start it it won’t crank. Google it ppl said it could b crank sensor replaced that no start. Replaced battery still no crank. Light turns on but no crank. Checked with both keys. Need help car been parked for over a month now. Thanks

Maj. Dundee

You cannot leave any vehicle idle for a long period of time as all the modules will drain voltage. When that happens and the battery voltage falls below 9.7 v multiple codes will be stored in many modules.

After replacing the battery you must scan for codes in all modules and all those codes must be deleted, if you don't the vehicle will not be able to crank or start the vehicle.

You need a scanner.

E63sMonster

once battery was replaced there was only one code of low coolant which I deleted. Car still won’t crank.

Maj. Dundee

Do you own a scanner, NOT A CODE READER ? YES OR NO ?

E63sMonster

yes

Maj. Dundee

Then you must check for codes of low battery voltage in the ECM . If the codes are not deleted, the car will not start or crank.

What scanner do you own?

E63sMonster

i hav icarsoft max. I hav to figure it out to c how to check low voltage in ecm.

Maj. Dundee

When you want to check for codes, click on CHECK FOR CODES ON ALL MODULES.

E63sMonster

Finally had some free time plug my computer in. When I check for all codes noting comes up I did individually check for codes when I did for rear Sam module it gave me these