Onan HGJAA-HGJAF error code 4 (Overcrank)
First-level fault. Cranking exceeded 30 seconds without engine starting. Controller cannot sense generator frequency.
What to check, and in what order, is in the app. The flow Overcrank (Fault Code 4) - No Start 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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