Gaschecker

I bought an 2003 sl55 amg they had been sat under a tree for a couple of years and hasnt been used.

straight away for 2 new battery’s and got the car fired up without an issue although was in limp mode.

gargae for hold of it and diagnosed abs rear axel drive shaft rings perished so were replaced and all was good.

MOT passed.

took it to get washed (boot was leaking and hasn’t had time to get repaired)

driving back from washing it with it with a hose pipe and the car engine lost drive and power steering was lost and then ground to a stop.

car wouldn’t crank. The radiator fan was going full speed.

all the day light up without issue.

the suspension lights on the centre console all light up with 2 red led’s and car is at full height and no way to change.

took battery’s off an recharged but still no crank and fan on full blast.

ive checked a couple of sensors and have 5v to both.

during the initial stop I heard some relays behind the seat going mental.

can anybody help me?

ive had it plugged into Star and the guy says it’s a paw pump issue causing the initial fault and the car not starting.

any help of checks to follow would be good.

dan

Gaschecker

I have also checked every single fuse in the car. The fuses are all good and I have double checked all
fuse positions are correct and rated properly.

bobterry99

Dan, there are knowledgeable people on this forum with more of an appetite than me for engaging in these sorts of threads, and I trust one or more of them will reply. Until then, a couple of points/questions to move this along.

You might explain in a reply what you mean by "limp" mode. The throttle, suspension, transmission, and power system all have a limp mode.

To be clear, you turn the key to position "3" but the starter does not engage?

What is a "paw" pump?

The cooling fan running at high speed (and a starter which does not engage?) may suggest the engine management controller has no power (user Rodney can confirm or refute this). The behaviour of the LEDs on the ride height control may be another obvious clue.

Rudeney

That's correct. When the engine suction fan gets power, but no signal form the ECU, it goes into default mode, which is high speed. Generally, when you switch the ignition on (position 2) and the fan runs on high, it means that the ECU is not communicating.

Sounds to me like water got somewhere is shouldn't have. The ECU is located in the e-box, along with the front left SAM, on the side under the hood. Maybe water got in there?

Gaschecker

So to be clear.

Its been plugged into star and one of the faults was the Pse pump. He says that’s stopping car from starting. Find it hard to believe as the central locking and soft close works for about 2 minutes after recycling the power.

When the key is in position 3 the car doesn’t attempt to crank

When in position 2 the radiator fans comes on full blast.

@Rudeney

what multi meter checks can I perform to test.

i have another guy coming to plug into car with Merc’s lastest software. I’ll ask him to check all sam’s and ecu.

i was wondering if it could be linked to an airbag fault where the car thinks and airbag has been deployed and let off a charge in the sams which could also be preventing car from starting.

thanks for everyone’s help on this @bobterry99

i’m trying to rescue this car from dying. :-)

bobterry99

I may be overlooking something obvious, but I strongly disagree. I surely hope neither that bloke nor the one who is coming with another Star kit is charging you much -- not when you can enjoy one of your own for so little money.

Incidentally, the "latest" software is of little or no benefit in comparison to the old.

Since the engine management controller seems to be dead, I would have a look at the attached schematic which shows power distribution to that and the other controllers and fuse boxes.

Gaschecker

Hi Guys,

Right had some fault codes sent to me. SL R 230.474

B1E70 The control unit PSE no longer sends on the CAN bus

ICM
B112D Fault in CAN communication with control unit N60 (central Locking Control Module

ESP
C151B Fault in CAN Communication with control unit Engine Control Module
C14B7 Steering angle sensor is not initialised

P208F M16/7 (recirculating air flap sensor faulty
P202E -008 M16/6 (Throttle Valve Actuator) Deflection of throttle valve (P0120)

Can anybody help advise on if any of the above codes would prevent the car from cranking. These are the only faults the car has.

I will probably start with a new PSE pump and get that talking and ill have a mechanic take a look at the throttle actuator and air flap.

Thanks in advance for your continued help

Dan

alk247

Dan,

I am no expert, but based on what has been said in this topic, I believe that above fault is the root of your problem. I would definitely leave the PSE pump for now and deal with the ECU.

Rudeney

But I don't think that alone would prevent the engine from starting. Of course if the ECU is not communicating at all, then that would cause that error along with others. Was SDS able to communicate with the ECU at all?

Gaschecker

Yes no problem at all. ECU itself showed no errors. Only esp talking to ecu.

Gaschecker

Checked the key and all the functions showed to work
perfectly. Also stop lamp was also working fine and showing on the diagnostics when break pedal pressed.

MUSTANGRIDAH

Was this ever solved…?