ME2.7.2(AMG)

Idle speed control detects unmetered air. (P0505)


Possible cause:

- Unmetered air
Affected functions:

- Engine output

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Test 1: Inspect charge air system for leaks.

1. Inspect charge air system for leaks.
Inspect charge air system for leaks.Possible cause and remedy

- Check charge air system for leaks and tighten all hose clamps (see diagram).
- Check for unrestricted flow in charge air system.
Note

- If no boost pressure is built up, it may be because the turbocharger is not functioning (blocked).In this case, remove the exhaust system and check for free movement of both turbochargers by hand.
Figure legend/figure

- 5/1-Charge air cooler, left cylinder bank
- 5/2-Charge air cooler, right cylinder bank
- 12- Intake manifold
- 110a-Left turbocharger
- 110b-Right turbocharger
- 110/1-Suction pipe
- 110/6-Boost pressure pipe
- 121/1-Air cleaner, left cylinder bank
- 121/2-Air cleaner, right cylinder bank
- 110/7-Hose section with hose clamp
- 101/8-Y-connection
- M16/6 (Throttle valve actuator)
B- ExhaustD- Clean air downstream of air cleanerE- Charge air