| Checking fuel pressure (low pressure) up to high-pressure pump |
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| Control unit for electric fuel pump OK. |
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| Battery voltage at least 11 Volt |
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| Connect vehicle diagnosis and service information system -VAS 5052- and select engine control unit. |
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| Select “Engine electronics” in vehicle self-diagnosis. |
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| Then select function read “Measured values”. |
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| Select measured value block 103. |
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| With ignition on, the fuel pressure (low pressure) is indicated in display zone 1. |
Note | When the ignition is switched off and on, the control unit for the electric fuel pump -J538- will activate the fuel pump for several seconds. |
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| Measure the fuel pressure (low pressure). |
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| Specification: approx. 6 bar (5 ... 8 bar) |
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| If reading does not match specification, check delivery rate of electric fuel pump → Rep. Gr.20. |
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| Check fuel pressure and residual pressure using K-Jetronic pressure tester -V.A.G 1318- → Chapter. |
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