DTC's
System errors within the ECU show up as DTC Errors illuminated in red in the Emtune software.
They are also associated with the engine check light, should one be configured.
The source of the error is straight forward to determine.
Click on the red DTC tab & a breakout DTC list will appear.
This list will contain all of the current errors.
For this example, we will look at P0107 - Manifold Absolute Pressure Circuit Low Input.
Press F3 to open the ECU Runtime Values Tab
Using the Raw inputs tab, determine if the voltage observed at the input is within the defined range of operation
Ensure the input calibration error threshold is set outside the normal operating range of the sensor.
If the calibration data is correct together with correctly set error thresholds.
The error can be considered valid and should be investigated.
A valid version of the example error (P0107) may indicate a dead short or simply the sensor is unplugged
What is a Diagnostic Trouble Code (DTC)?
Diagnostic trouble codes (or fault codes) are codes that are stored by the ECU. These are stored in response to a problem when a sensor in the car reports a reading that is outside the normal/accepted range
These DTC’s identify a particular problem area and are intended to provide the user with a guide as to where a fault might be occurring within the vehicle. The ECU will always reply with a ‘P’ code or Powertrain code
DifferenceĀ Between Generic & Manufacturer Specific…
| Code type | Explanation |
|---|---|
| Generic (normally P0xxx) | The definition for the code is defined in the EOBD / OBD-II standard and will be the same for all manufacturers. |
| Manufacturer-specific (normally P1xxx) | Where manufacturers feel that a code is not available within the generic list, they can add their own codes. The definitions for these are set by the manufacturer. |
In general, codes that begin with P0 are Generic codes, whereas codes that begin with P1 are manufacturer-specific in this case codes generated by Emtron.