Scania Fault Code

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135 (SPN 110 FMI 3)

Fan running at max speed; Cold start enrichment active while hot; High temp alarm.

System

Not specified

Symptom

Fan running at max speed; Cold start enrichment active while hot; High temp alarm.

Diagnosis & fix steps

Coolant Temp Sensor Voltage High. LOGIC: Signal > 4.5V (Open Circuit). The ECM assumes a "fail-safe" cold value, causing the engine to over-fuel and the fan to lock on. ACTION: 1. Unplug sensor and bridge pins (Jumper Test). If code changes to FMI 4, wiring is good. 2. Inspect the harness where it passes near the thermostat housing. FIX: Replace Coolant Temp Sensor or repair wire break at the plug.

Red Seal field insights

Scania DC16s use the coolant temp to control the oil cooler bypass. If this sensor fails, your oil temps can climb because the ECM doesn't know the engine is warm enough to open the cooler flow.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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