Golf GL L4-2.0L (AVH) (2002)
If specification is not obtained:
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Check quantity supplied by fuel pump
If specification is obtained:
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Switch ignition off.
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Hold pressure and check for leaks. Observe pressure drop on gauge. After 10 minutes, there must be a residual pressure of at least 2.0 bar.
If holding pressure drops below 2 bar:
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Start engine and run at idling speed.
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Switch ignition off after the pressure has build-up. At the same time close pressure tester VAG 1318 shut-off tap (handle at right angles to
through-flow direction -arrow-).
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Observe pressure drop on gauge.
If pressure does not drop
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Check fuel pump non-return valve
If pressure drops again:
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Open shut-off tap on pressure tester VAG 1318 (handle point in direction of flow -arrow-).
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Start engine and run at idling speed.
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Switch ignition off once the pressure has built-up and clamp off return hose at same time.
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If pressure does not drop:
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Replace fuel pressure regulator
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Erase DTC memory to return learned values to a neutral (default) position.