Cummins/Onan — Engine Control System Checkout Procedure
Testing & diagnosis · Engine control modules
From a Cummins/Onan service manual covering: 165.0 DFP, 165.0 DYH, 192.0 DFP, 200.0 DFP, 200.0 DYH, 208.0 DFM, 208.0 DYB, 208.0 FT, 230.0 DFP, 250.0 DFS, 250.0 DFT, 250.0 DHA…. Check it applies to your exact model before use.
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Before you start
- Do not make voltage measurement on any module unless an extender card is used.
Procedure
- Remove front cover of engine module rack.
- Remove Cycle Cranker module A14.
- Insert Engine Control Tester module into A14 position.
- Set rheostat on Tester module fully counterclockwise.
- Place R-S-R switch in run position; depress lamp test switch to test fault lamp.
Tools required
- Engine Control Tester Part Number 420-0336 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.