Cummins/Onan — Controller A1 Removal / Replacement
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAV, Cummins/Onan MDKAW, Cummins/Onan MDKAZ, Cummins/Onan MDKB, Kubota D1105 engine, Kubota V1305 engine, Kubota V1505 engine, Kubota V1903B engine, Kubota V2203B engine, Kubota V2803B engine
Before you start
- Accidental or remote starting can cause severe personal injury or death
Procedure
- Disconnect negative battery cable before removing any panel.
- All models except MDKBG: remove front access door and left panel.
- Remove screw securing bond strap to left side of controller.
- Remove three connectors and two mounting screws and withdraw controller left.
- MDKBG: remove four screws securing controller enclosure to genset.
- Remove four screws securing controller to enclosure and disconnect three connectors.
- Reassemble and reconnect the electrostatic discharge bond strap.
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Connections through connectors P1 (black), P2 (grey) and P3 (green)
Full service-parts list: Cummins/Onan MDKAV →, Cummins/Onan MDKAW →, Cummins/Onan MDKAZ →, Cummins/Onan MDKB →, Kubota D1105 engine →, Kubota V1305 engine →, Kubota V1903B engine →
Source: Cummins/Onan 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.