Network
generic or reserved
U3570
Stack Inlet Coolant Temperature Sensor Circuit
Generic fault on the coolant temperature sensor at the fuel cell stack inlet (deionized coolant cools the membrane electrode assemblies).
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 70
Possible causes
- Sensor failed high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–4 h
- Component: stack inlet coolant temp sensor
- Component: sensor wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012