Fuel Evaporation System Test

Test Condition:
- Engine idling and coolant temperature above 50°C (122°F)

Model Year 1984 and Later
Functional Diagram of Vacuum Line Routing





1. Intake manifold
2. Throttle valve housing
3. Air guide housing
4. Air flow sensor
5. Fuel distributor
6. Warm-up compensator
7. Pressure damper
8. Ignition distributor
9. Throttle (orifice)
15. Control unit
16. Oxygen sensor (model 107)
16a. Oxygen sensor (model 126)
17. Frequency valve
18. Throttle valve switch
19. Temperature switch 16°C (61°F) oil
25. Air pump
29. Check valve (air injection)
30. Suction line, air pump
32. Cylinder head
33. Primary catalyst (model 107)
33a. Primary catalyst (model 126)
37. Thermo-vacuum valve 50°C (122°F)
37a. Thermo-vacuum valve 50°C (122°F)
38. Air cleaner
40. Air shutoff valve
43. Switchover valve
44. Check valve (vacuum)
46. Timing chain housing cover
50. Fuel tank
51. Vent valve
52. Charcoal canister
53. Purge valve
100. Vacuum switch, acceleration enrichment
Model year 1985 and prior if vacuum switch was subsequently installed

a) Leak-off connection
b) To exhaust manifold

Color Code
bk = black
bl = blue
gr = green
pu = purple
re = red
wh = white

Test Procedure:

Fig. 1:

Fig. 2:

Testing of fuel evaporation control system