AD07.61-P-6000-26C | Secondary air injection, ME-SFI fuel injection system electrical testing | Model 170 with code (923) low-pollutant D3 compressor Model 202 Model 202 with code (923) low-pollutant D3 compressor |
| Scope of test | Tester/test connection | Operation/ prerequisite | Specified value | Possible cause/ remedy | ||
1.0 | Secondary air injection (causal chain) Model 170 with code (923) low-pollutant D3 compressor Model 202 Model 202 with code (923) low-pollutant D3 compressor Measurement: O2 sensor signal upstream of TWC |
23 (31C) Com-pressor 3 (3A) 3 (3A) Naturally aspirated engine 3 (3A) 3 (3A) | N3/10 N3/10 |
24 (32C) 125 (21F) 66 (10E) 20 (28C) 66 (10E) | At engine coolant temperature of at least > 80 °C allow to idle for 2 minutes Insert jumpers in socket box | O2 sensor voltage oscillates between -0.2 V and +1.0 V With air pump or compressor running, voltage changes to < 100 mV within 20 s. | Air pump changeover valve stuck (Y32) Secondary air injection combination valve No air pump/compressor output |