Onan HGJAA-HGJAF error code 47 (Ignition Fault)
Controller unable to sense ignition pulses (used for RPM input). On HGJAB and HGJAE the fault is enabled only in Engine Run Only (ERO) mode.
What to check, and in what order, is in the app. The flow Onan Code 47 — Ignition Fault walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Cummins-Onan Service Manual (document 0983-0501 Issue 26, March 2018, 202 pp) covering HGJAA Spec A-E / HGJAB A-E / HGJAC A-C / HGJAD A-E / HGJAE A-E / HGJAF A-C (rv-tech-resources/25-onan-hgjaa/0983-0501_Onan_HGJAA-HGJAF_Service_Manual_Issue_26.pdf)
- Onan HGJAA Generator Technician Service Diagnostic Reference (rv-tech-resources/25-onan-hgjaa/Onan_HGJAA_Generator_Technician_Service_Diagnostic_Reference.md)
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