Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hello, the secondary air injection system can be tricky to diagnose ,what happens if you jump the relay terminals? instead of jumping the pump.
ok i hear you, theres no worry though, let me get a diagram up.
ok what is your build date its on the drivers door sticker
NM ok so its fuse 45 and relay K28 correct?
pins 1 and 2 of the relay are the ones that are activated by the ecm to turn the relay on, so you need to see if power is there on a cold start.
ok so jump pins 3 and 5 on the fuse box where the relay goes, there is a diagram on the side of the relay and numbers on the bottoms of the pins
ok so take a wire with terminal ends and bridge the 87 and 30 terminals or the 3 and 5 terminals depending on the relay you have since you said it has a 85-85 that tells me it will be 87 and 30. you are pretty much going to jump power from 30 to 87 where the relay terminals would go into the fuse box
im sorry i meant since you said it has 85 and 86
ok yes but now i want you to jump power from 30 to 87 to see if it will activate the pump
are you able to do this tonight because i cant be on much longer and i would like to get your situation resolved
ok i am going to opt out i wish you luck.
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Did you still need help with this here?
Let me know so we can continue,thanks Pete.
Do you have the radio code as the battery will need disconnected?
Since the pin fell into the fuse panel you want to disconnect the battery to prevent any shorts from occuring first here.Below is the instructions on how to remove this fuse panel so you can remove the pin.Let me know when you get the pin removed so we can continue from here.
Remove, Install 1 Open hood and raise to vertical position 2 Disconnect ground cable of battery CAUTION: To prevent unintended contact, insulate ground lead cable lug 3 Remove cover for fuses (1) NOTE: Installation: Check gasket for damage 4 Unscrew screws (3) and remove cover for control module section (2) NOTE: Installation: Check gasket for damage 5 Unscrew screws (4) and remove fuse and relay holder (5) upwards 6 Mark and disconnect electrical connectors to fuse and relay holder. NOTE: Connectors are fitted with mis-plug protection to prevent mix-ups. - Assignment and cable connections of fuse blocks 7 Detach electrical screwed connections to fuse and relay holder and remove fuse and relay holder 8 Remove injection system control module 9 Remove traction system control module 10 Unscrew screws (6) 11 Disconnect electrical coupling to blower motor/module box (M2/2) 12 Pull the wiring loom without separation point from the engine or major assemblies compartment with cable retainer out of the fuse and relay module (F1) and route the wiring loom back into the engine compartment. 13 Remove cover below instrument panel 14 Unhook control cable for hood release (13) from the operating lever and route cable outwards through the fuse and relay module 15 Unscrew nuts (8). 16 Disconnect electrical connectors and connections in the left footwell NOTE: This step involves all lines and wiring harnesses which run through the fuse and relay module and do not have a separation point inside the fuse and relay module. 17 Pull back wiring harnesses to the fuse and relay module 18 Unhook hoses for the windshield washer system from the brackets on the fuse and relay module 19 Remove windshield washer system reservoir 20 Remove fuse and relay module 21 Install in the reverse order