Mercedes Benz SLK 5.5 2005 - Code P2003 malfunction of secondary air injection #
Posted by Scott Neal on December 13, 2013, 11:22 pm
Year of Manufacture *: 2005 Engine Size and Code *: 5.5 ( Optional ) Scanner Used: Bosch kts snap on solus ultra ( Optional) Fault Codes: p2003 malfunction of secondary air injection
Hi
Looking for some advise on this one. Car came in with the engine light on. Scanned for codes. P2003 malfunction of secondary air injection (p0410). Cleared code but it returns again after start up. Checks done so far are I've checked power and ground supply to both air pump and secondary air solenoid control valve on cold start up. They are both actuated at the same time for about 50 secs when starting from cold. When actuated you can hear the air pump, it doesn't sound noisy. The solenoid when actuated puts manifold vacuum to the secondary air valves on both banks on the intakes which i think confirms it's working OK. I have also applied vacuum to these manually without the engine running to check they are opening, and blown through the pipe from the air pump to ensure they are seating OK and opening OK. Ive also checked the intake system for leaks with smoke pro, there is a tiny amount of smoke comes out of a shaft on the egr valve, not sure if this is normal? Could it be that the pump is drawing to much current or maybe not pumping enough air? I'll try attaching a picture of the pico capture but not done it before so I'll see how it goes. The pump draws 135 amps of current on start up then goes down to 35 amps.
Re: Mercedes slk 55 amg 2005 p 2003 malfunction of secondary air injection (p0410)
When I follow the actuator function instructions on the solus ultra it displays the pre cat O2 sensor voltages, it then actuates the air pump and solenoid valve. The O2 sensors react almost instantly. It only activates the pump for around 3 seconds or so but it's long enough to see the sensors react. The fault didn't occur this morning for some reason, typical. I was just looking at the freeze frame data I captured when the car came in initially. The fault occurred when the car was stationary and the engine was at 79 degrees. Would the pump also be activated when it's warm briefly and the ecu monitors the O2 sensors to make sure they react as a means of checking the system is working ok?
Re: Mercedes slk 55 amg 2005 p 2003 malfunction of secondary air injection (p0410)
Yes it does use the o2 sensors to monitor the system, there is a test on Star which it has to see the O2 voltage drop below a certain voltage, but i cant remember how for how long or what min voltage it has to attain
on December 14, 2013, 5:38 am, in reply to "