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Intake Air Heater #1 Circuit – Voltage Above Normal or Shorted to High Source
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Overview
Intake Air Heater #1 Circuit – Voltage Above Normal or Shorted to High Source
| CODE | REASON | EFFECT |
| Fault Code: 2555 PID: S070 SPN: 729 FMI: 3 LAMP: Amber SRT: |
Intake Air Heater #1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the intake air heater signal circuit. |
The intake air heaters may be ON or OFF all the time. |
 Intake Air Heater #1 Circuit
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Circuit Description
The intake air heater improves starting and white smoke control in cold ambient conditions. The ECM controls relays that switch power to the intake air heater. 12-volt systems will have two relays while 24-volt systems only require one relay.
Component Location
The intake air heater is located at the air inlet connection into the intake manifold. The location of the intake air heater relays will vary by OEM. Refer to Procedure 100-002 in Section E.
Shop Talk
Possible causes of this fault code include:
- Intake air heater relay signal wire not connected to the relay
- Intake air heater relay return wire not connected to the relay
- Open circuit in the intake air heater relay signal wire
- Open circuit in the intake air heater relay return wire
- Intake air heater signal wire shorted to a voltage source.
Refer to Troubleshooting Fault Code t05-2555
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