Volvo Penta Group 23 EDC III — Functionality check of relays
Testing & diagnosis · Relays (main relay)
For the Volvo Penta Group 23 EDC III, from the Volvo Penta service manual.
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Procedure
- Disconnect the main relay from the engine.
- Measure between pins 87a and 30 (high frequency); multimeter should emit an alarm.
- Measure between pins 87 and 30; multimeter should not emit an alarm.
- Measure resistance between pins 85 and 86; should read 240–270 Ω.
- Connect 24V between pins 85 and 86; measure between pins 87 and 30 (should alarm).
- Connect 24V between pins 85 and 86; measure between pins 87a and 30 (should not alarm).
- Replace the relay if test results do not match.
Tools required
- 9510060-8 Multimeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pins 85–86: 240–270 Ω
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.