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SPN 677 — Starter Relay

Safe to driveTo the nearest safe stop

J1939 code SPN 677. Below — how the fault is worded at the factory by Dongfeng, KAMAZ, MAZ, Renault Trucks, SITRAK and YaMZ, and what the second half of the code (FMI) means in the standard.

DongfengKAMAZMAZRenault TrucksSITRAKYaMZ

Dongfeng

FMI 3Short circuit to ground of the starter blocking relay. Scan tool code: P26E4. Effect: The engine will not start.
FMI 4Short circuit to power or open circuit of the starter blocking relay. Scan tool code: P26E4. Effect: The engine will not start.

KAMAZ

FMI 3Starter relay, low side: short circuit / open circuit. K-line code on KamAZ-5490: MR2 18005.
FMI 4Starter relay, low side: short circuit / open circuit. K-line code on KamAZ-5490: ADM3 13304.
FMI 5Starter relay, low side: short circuit / open circuit. K-line code on KamAZ-5490: MR2 18009.
FMI 6Starter relay (output relay 1). K-line code on KamAZ-5490: MR2 18008.
FMI 7Starter relay (output relay 1). K-line code on KamAZ-5490: MR2 18086.
FMI 14Starter relay (output relay 1). K-line code on KamAZ-5490: MR2 18033.

MAZ

FMI 3Starter relay driver circuit fault - Short to battery positive. Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.
FMI 4Starter relay driver circuit fault - Short to ground. Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.
FMI 5Starter relay driver circuit fault - Open circuit. Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.

Renault Trucks

FMI 3Starter relay (DCI11 only), short to battery voltage. Repair: Check the starter relay and the wiring.
FMI 5Starter relay (DCI11 only), open circuit or short to ground. Repair: Check the starter relay and the wiring.

SITRAK

FMI 2Over-temperature of the starter relay powerstage, low side. Scan tool code: P26E4. Effect: The engine will not start.
FMI 3Starter relay circuit short to battery, low side. Scan tool code: P26E4. Effect: The engine will not start.
FMI 4Starter relay circuit short to ground, low side. Scan tool code: P26E4. Effect: The engine will not start.
FMI 5Open load in the starter relay circuit, low side. Scan tool code: P26E4. Effect: The engine will not start.

YaMZ

FMI 3Starter relay driver circuit fault (Short to battery positive). Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.
FMI 4Starter relay driver circuit fault (Short to ground). Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.
FMI 5Starter relay driver circuit fault (Open circuit). Blink code: 1-2-1. The engine will not start. Repair: Check the starter relay and its wiring.

What FMI means in J1939

SPN 677 FMI 2677/2 · 677.2data erratic or intermittent
SPN 677 FMI 3677/3 · 677.3voltage above normal or shorted high
SPN 677 FMI 4677/4 · 677.4voltage below normal or shorted to ground
SPN 677 FMI 5677/5 · 677.5current below normal or open circuit
SPN 677 FMI 6677/6 · 677.6current above normal or grounded circuit
SPN 677 FMI 7677/7 · 677.7mechanical system not responding
SPN 677 FMI 14677/14 · 677.14manufacturer-specific instructions

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: To the nearest safe stop

The electrical system is not holding voltage. While the engine runs the alternator carries it; shut it off and you may not restart.

Next the lights go, then modules start dropping out and false codes appear all over the truck. Get to somewhere with help without shutting the engine down.

What to check on the spot

Check the battery terminals and earth strap — corrosion and loose clamps throw false codes all over the truck. Running voltage should be 27–29 V.

Nearby: power supply

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.