Quote:
Originally Posted by greenberet123
Getting 2A00, so I disconnected the secondary air pump hose which goes to the valve and did a cold start, but no air coming out of the pump. I can't tell from the sound whether it's working or not, so decided to remove it.
Looks like I need to provide a 12V DC source to test it. I don't have one. All I have are 1) The 12V charging port inside the car, and 2) A 12V 1000A battery that I use to jump-start. Would any of these be ok to test the air pump? I'm guessing 1000A is too much for the air pump, but will it only draw as much current as it needs? [Yes, that's what "Resistors" are for. To test for yourself, get SMALLEST 12V bulb you can find, like a 4W low voltage bulb, and use Patch Cables/ Alligator clips to connect it to that battery. Bulb will light & NOT burn out.] |
I don't have an N51 with Air Pump, but based upon the BMW Fault Code Lookup Fault Information page linked below, 2A00 does NOT suggest something wrong with the PUMP, but rather the passage to the Valve in Bank 1 (similar supply to Bank 2 and separate code for condition in Bank 2). It appears from Bentley that the Hex-code is the SAME for each, but the P-code is P0491 for Bank 1, and P0492 for Bank 2.
https://bmwfault.codes/XMLDiagView?d...QANQAxADAANAA=
There are about 9 different P-codes for Secondary Air Injection Faults, so make SURE you have read ALL codes. A simple P-code reader may be better than a Hex-code Scan Tool for this, UNLESS the Tool provides the CORRECT Fault Definition for YOUR MSV80 DME. A "2A00" code can mean issue with Flow to (1) Bank 1, (2) Bank 2, (3) BOTH Banks (P140A).
You do NOT indicate if you have the proper wiring diagram for Secondary Air Pump on your vehicle. I'll attach that wiring diagram from ISTA for 2008 328i E93 N51 to next post. Since the Connector has ONLY TWO wires, and Brown (X1124/1) is always Chassis Ground on E9x Models, it's NOT EASY to screw up if mind is engaged.
George