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Exhaust Gas Temperature Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect.
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 0004 PID: SPN: None FMI: LAMP: SRT: |
Exhaust Gas Temperature Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect. The exhaust gas treatment monitor unit has detected that the exhaust gas temperature sensor number 1 is not changing. |
None on performance. |
 Exhaust Gas Temperature Sensor Number 1 Circuit
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Circuit Description
The exhaust gas temperature sensor provides the exhaust gas temperature to the exhaust gas treatment monitor unit through the exhaust gas treatment monitor harness.
Component Location
The exhaust gas temperature sensor will be located near the inlet to the exhaust catalyst. The location will vary depending on application.
Shop Talk
This fault code is activated when the exhaust gas treatment monitor unit detects that the exhaust gas temperature signal value is not changing (ie, stuck in range). In order for this fault code to activate, the exhaust gas treatment monitor unit must detect that the exhaust gas temperature is below 100°C [212°F] during one hour of continuous engine operation.
Possible causes of this fault code include:
- Faulty exhaust gas temperature sensor.
This fault code will only be present in the exhaust gas treatment monitor unit, and will not be present in the engine electronic control module (ECM). The exhaust gas treatment fault code and maintenance lamps will both flash four times in sequence to alert the operator that this condition exists. The engine diagnostic lamps will not illuminate.
Refer to Troubleshooting Fault Code t05-0004
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