Volvo Owners Club Forum - View Single Post - Engine 850: B5202S/2.0/10v:

stevepcar · Sep 17th, 2021, 17:29

I have followed a tutorial on Mathews Volvo forum and soldered a diode between the 32 & 37 positions in the ECU. However, after a few seconds from starting the engine the EML light still comes on. I ran the codes and it is showing up as 4-4-2, which means that the air pump is still faulty. So I cleared the codes and got 1-1-1, which was fine. After starting the engine again after a few seconds the EML light came back on & the code 4-4-2 reappeared. Do I need to disconnect the air pump as well to stop the ECU thinking it is still malfunctioning. If so is that the only disconnection I need to make pleasse. Any advice welcomed.

Sep 17th, 2021, 17:29	#2
stevepcar Steve Last Online: Today 11:02 Join Date: Jul 2012 Location: Bristol	Deleting Secondary Air System (Air Pump) I have followed a tutorial on Mathews Volvo forum and soldered a diode between the 32 & 37 positions in the ECU. However, after a few seconds from starting the engine the EML light still comes on. I ran the codes and it is showing up as 4-4-2, which means that the air pump is still faulty. So I cleared the codes and got 1-1-1, which was fine. After starting the engine again after a few seconds the EML light came back on & the code 4-4-2 reappeared. Do I need to disconnect the air pump as well to stop the ECU thinking it is still malfunctioning. If so is that the only disconnection I need to make pleasse. Any advice welcomed.