Too high or low fuel pressure

/ 9-3 (9440) / 2010 / 2. Engine / 4-cylinder diesel / EDC 16 engine management system / Fault diagnosis, fault symptoms / Too high or low fuel pressure

Fault symptom

Too high or low fuel pressure

Criteria

Diagnostic trouble codes: P0090 or P0091

Procedure

1.	Check the pressure from the feed pump. The pressure should be 3.8 - 5 bar.

2.	Check that the back pressure in the return line is not too high. The pressure may be a maximum of 1 bar.

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