Exhaust Gas Recirculation: Testing and Inspection

Special Tools:

Conventional tools
- Tachometer -- All-Test 3610-MB

Y-distributor - 117 078 01 45:

Function diagram exhaust gas recirculation:

1 Fuel distributor
12 Intake manifold
79 Thermovalve 50°C
89 EGR valve 90 Vacuum amplifier
90a Shutoff diaphragm
90b Check valve
123 Throttle valve housing
155 EGR line
156 Exhaust manifold

Test Page 1:

Fig. 1:

Fig. 2:

Fig. 3:

a To EGR thermovalve
b To fuel evaporation, canister thermovalve
c From purge valve
d To EGR vacuum control valve

Test Page 2:

Test Page 3:

Fig. 4:

79 Thermovalve
90 Vacuum amplifier