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SPN 49 — Power Amp (Meritor (ex-WABCO), Renault Trucks and ZF AS-Tronic)

Safe to driveDrivable, but watch it yourself

SPN 49 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Meritor (ex-WABCO), Renault Trucks and ZF AS-Tronic, and what the second half of the code (FMI) means.

Meritor (ex-WABCO)Renault TrucksZF AS-Tronic

Meritor (ex-WABCO)

FMI 3Power Amp. Out Valve Right Front — Shorted to Battery
FMI 5Power Amp. Out Valve Right Front — Open Circuit
FMI 6Power Amp. Out Valve Right Front — Short to Ground

Renault Trucks

FMI 10Open circuit. Repair: Switch the ignition off, switch it on again and repeat the test. If the fault persists, replace the control unit.

ZF AS-Tronic

ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.

FMI 10Fault on transmission brake valve Y1 output circuit.

What FMI means in J1939

SPN 49 FMI 349/3 · 49.3voltage above normal or shorted high
SPN 49 FMI 549/5 · 49.5current below normal or open circuit
SPN 49 FMI 649/6 · 49.6current above normal or grounded circuit
SPN 49 FMI 1049/10 · 49.10abnormal rate of change

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Drivable, but watch it yourself

This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.

You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.

Nearby: other

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