If you receive customer reports in the model vehicles listed below of the check engine light coming on and codes P2003 (M112, M113, M275), P2047 (M271), P0810 (M272, M273) or P0814 (M272, M273) are stored in the engine control module memory, perform the below procedure.
1. Air Pump Relay
Valid for Models: 164.186, 170.465/466, 171.454/456, 199.376, 203.052/054/056/061/064/065/076/ 081/084/087/092/261/264/281/284/764, 209.356/365/372/375/376/456/465/472/475/476, 211.056/065/070/072/076/082/9083/087/090/256/265/276/282/283/287, 215.373/374/375/376/379, 216.371, 219.372, 220.067/170/173/174/175/176/ 179/183/184, 221.171/186, 230.471/472/474/475/ 476/477/479, 251.156/165
This condition may be caused by a malfunctioning air pump relay. When the secondary air pump relay malfunctions, the air pump may be actuated beyond the maximum permissible operating time. This overload may lead to failure of the secondary air injection pump and result in a malfunction in the secondary air injection system. Proceed as follows:
Note: If diagnosis reveals a malfunctioning air injection pump, refer to step 1.2.
1.1. Test the secondary air injection function chain with SDS.
1.2. If the secondary air pump is determined to be defective, remove/replace the secondary air pump and air pump relay (refer to WIS document: AR14.30-P-7251QB).
1.3. If it’s determined that only the relay is defective, replace only the relay and retest the secondary air injection function chain with SDS.
1.4. Program the engine control module.
2. Check Valve for Vacuum Actuation of Air Pump
Valid for Models: 163.154/157/172/174/175, 164.175/186, 171.454/456/473, 199.376, 203.040/052/ 054/056/0361/064/065/076/081/084/ 087/096/261/264/281/284/740/764, 209.076/356/365/375/376/456/465/475/ 476, 211.056/065/070/076/082/083/087/ 256/265/276/282/283/287, 215.373/374/ 375, 219.375/376, 220.067/170/173/174/ 175/183/184, 230.472/474/475, 463.246/ 249/271
