ME-SFI secondary air injection - Fault code description - AD07.61-P-4000-42A
| 1 | Fault code | P1420 Air pump changeover valve (Y32) P4453 Air pump relay in the fuse and relay module |
| 2 | Fault storage Activation of the engine diagnosis (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp |
Following the expiry of the test duration and fault Following two consecutive driving cycles with fault |
| 3 | Frequency of the test | Continuously |
| 4 | Checked signal or status | The voltage supply of the air pump relay in the fuse and relay module and the air pump changeover valve (Y32) are evaluated by measuring the current in the relevant output stage. |
| 5 | Fault setting conditions Limit values |
Secondary air injection OFF
: A maximum of 3 V may be present at the output Secondary air injection ON : At least 9 V must be present at the output |