Engine Test, Adjustment

Engine Test, Adjustment

NOTE:
- Engine test adjustment is only possible using the hand-held tester (HHT) or equivalent scanner.
- With starting or warm up complaints do not condition engine to operating conditions but proceed according to complaint.
- Refer to "Test and Adjustment Data [Specifications]" for measured readings. Test and Adjustment Data [Specifications]

Listing of Test Steps
1. Test equipment
Connect/disconnect according to connection diagram
2. Throttle control linkage
Check throttle valve for free movement and condition. Lubricate bearings, gate levers and ball sockets.
3. Engine coolant level
Check, correct.
4. Engine oil temperature
Check.
5. Engine control module version => Ignition: ON
Read, only possible using HHT.
6. DTC's in engine control module (ME-SFI) => Ignition: ON
Read using HHT. Reading Diagnostic Trouble Codes
7. Engine oil level
Check, observe condition of oil.
8. Fuel tank level
Check.
9. WOT contact, CTP contact at pedal value sensor
Check.
10. Fuel pressure
Check.

WARNING: Release pressure using 2 or 3 way valve on gauge.

11. Engine rpm at Idle (transmission selector lever in P/N position)
Check.
12. ECT
Check.
13. IAT
Check.
14. Ignition timing
Check.
15. Throttle valve angle
Check.
16. Throttle valve stop
Check.
17. Battery voltage
Check.
18. Purge valve on-off ratio
Check.
19. Injection time => Engine: at Idle
Check.
20. EA actuator
Check.
21. Deceleration shut-off=> Engine: decelerating
Check.
22. AIR pump => Engine: at Idle
Check.
23. CTP and WOT recognition
Check.
24. Camshaft adjustment solenoid
Check.
25. Camshaft Hall-effect sensor
Check.
26. Air mass => Engine: at Idle
Check.
27. MAP voltage
Check.
28. O2S 1 voltage (before TWC)
Check.
29. Lambda control (before TWC)
Check.
30. O2S 2 voltage (after TWC)
Check.
31. Lambda control (after TWC)
Check.
32. Self-adaptation => Engine: at Idle/partial load
Check.
33. Transmission range (selector lever position P/N)
Check.
34. A/C compressor
Check.
35. Purge control system
Check.
36. Safety fuel shut-off
Check.
37. Torque
Check.
38. Idle speed under load
Check with selector lever in "D" (with service and parking brake applied) and consumers on.






Connection Diagram - (shown on model 140, engine 120)

A Throttle linkage
X11/4 Data link connector, (DTC readout, 38-pole)
014 Exhaust vent hose
018 Oil thermometer
042 Pressure gauge
087 Hand-Held Tester (HHT)
094 Multiplexer

Special Tools:

Component Locations