AD14.20-D-3000A | Exhaust gas recirculation (EGR) diagnosis operational check | 11.6.97 |
ENGINE 601.943 in MODEL 901, 902, 903, 904 with CODE (MD1) Low pollution vehicle according to EC class 1
| Exhaust gas recirculation (EGR) diagnosis, previous knowledge | ||
Function check | |||
Test step / scope of test | Measuring instrument / test connection | Operation / requirement | Cause / remedy |
1 Vacuum to solenoid valve | Tachometer Y distributor Vacuum manometer | Start engine Wait approx. 100 s Engine speed: 600 - 1000 rpm 0 mbar 1000 - 3300 rpm > 300 mbar > 3300 rpm 0 mbar | Control module defective Check individual parts |
2 Vacuum to solenoid valve | Tachometer Y distributor Vacuum manometer | Micro switch MS1 actuated Engine speed: 600 - 1450 rpm 0 mbar 1450 - 2500 rpm > 300 mbar > 2500 rpm 0 mbar | Control module defective Check individual parts |
3 Vacuum to solenoid valve | Tachometer Y distributor Vacuum manometer | Micro switch MS1 + MS2 actuated Engine speed: 600 - 3300 rpm In total speed range 0 mbar | Control module defective Check individual parts |