Volvo Penta Group 23 EDC III — Fault detection on unit injectors
Testing & diagnosis
For the Volvo Penta Group 23 EDC III, from the Volvo Penta service manual.
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Procedure
- Perform a relative compression test on the cylinders (value below 80% indicates a compression error; test three times).
- Perform an injector test (switch off one injector at a time; engine noise level should change).
- Perform a relative acceleration test (lower engine speed when measuring; compare cylinder results).
Tools required
- PC diagnostics program Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Relative compression limit values 80%–100%
Source: Volvo Penta service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.