Chain Length, Checking: Procedure

-- Remove the front noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING .

-- Remove the plug -arrow-.

Fig 1: Identifying Plug

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-- Turn the vibration damper in direction of engine rotation until the chain tensioner piston is extended the maximum distance in the direction of -arrow-.

Fig 2: Identifying Vibration Damper

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-- Count the visible piston teeth.

TIP: 

The visible teeth are all of the teeth that are located to the right of the chain tensioner housing -arrow-.

• If six or fewer teeth are visible, the timing chain must not be replaced.
• If six or fewer teeth are visible and there is an entry in the DTC memory: adjust the chain length using the Vehicle Diagnostic Tester, 01 - CHAIN LENGTH ADAPTATION DIAGNOSIS  and delete the DTC memory.
• If seven or more teeth are visible: replace the camshaft timing chain.