Cummins/Onan — Battery Temperature Sensor Test
Testing & diagnosis
From a Cummins/Onan owner's manual covering: 1.5HJBAA, 2.0HJBAA, 2.5HJBAA, 3.0HJBAA. Check it applies to your exact model before use.
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Procedure
- Disconnect the sensor at the Inverter-Charger and measure resistance across the two leads; replace if not 8000 to 15,000 Ohms at room temperature.
- While the sensor is disconnected, cycle power; after approximately 5 minutes the Display should indicate Fault 24, Battery Temp Sensor Error.
- Reconnect the sensor, cycle power and wait 10 minutes; the fault will not be declared if the sensor circuit is within operating limits.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Resistance 8000 to 15,000 Ohms at room temperature
Source: Cummins/Onan owner's 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.