EGR Temp. Sensor Signal Absent/Faulty (PTC)

FL. Diagnostic trouble code (DTC) 4-1-3 DI EZ 116 K (PTC)

* 4-1-3 Exhaust Gas Recirculation (EGR) temperature sensor signal absent or faulty (PTC)

EGR system with PTC type temperature sensor

See the table in section FH to determine whether the EGR temperature sensor is of the NTC or PTC type.EGR System Flow Too Low (NTC)

For EGR Systems with NTC type temperature sensors, see section FK.EGR Temp. Sensor Signal Absent/Faulty (NTC)




DTC conditions
The control module uses the signal from the EGR temperature sensor to determine whether there is an EGR flow or not. If the control module receives a signal which is too high, too low or faulty (the temperature sensor signal changes when the control module is not sending an EGR flow), a DTC is logged.

Causes of fault:
Faulty temperature sensor (break or short circuit in the sensor; sensor resistance is approx. 500-600 ohms at room temperature)
- Break in the signal wiring
- Grounding in the signal wiring
- Break in the wiring to GND
- Short circuit

FL1




Checking the EGR temperature sensor connector
- Ignition on.
Connect a voltmeter between terminal 1 in the EGR temperature sensor connector and GND.
- Read off the voltmeter. Make a note of the reading.
- Switch off the ignition.
- Take the connector apart.




- Clean the terminals with anti-rust spray.
- Grease the connector. (Grease P/N 1161417-9.)
- Put the connector together.
- Remove the GND terminal (at the intake manifold), clean and replace the terminal.




- Switch on the ignition again.
- Repeat the measurements.

If the readings have changed
^ the fault was caused by contact resistance in the connector and has been remedied.

If the reading is unchanged
^ check the wiring to GND FL2.

FL2




Checking the wiring to GND
- Ignition off.
- Remove the connector at the EGR temperature sensor.
Connect an ohmmeter between terminal 2 in the temperature sensor connector and GND.
The ohmmeter should read approx. 0 ohms.

If the reading is OK
^ check the signal wiring FL3.

If the reading is incorrect
^ check the wiring between terminal 2 in the temperature sensor connector and GND for breaks in accordance with NA2. NA. Checking the Wiring

FL3




Checking the signal wiring
- Ignition on.
Connect a voltmeter between terminals 1 and 2 in the temperature sensor wiring connector.
The voltmeter should read approx. 5 V.

If the voltmeter reads 0 V
^ check the signal wiring for breaks or grounding in accordance with NA2 and NA3. NA. Checking the Wiring

If the voltmeter reads approx. 5 V
^ try using a new EGR temperature sensor (PTC type).

If the voltmeter reads over 5 V
^ check the wiring between terminal 1 on the sensor and terminal 22 on the control module for short circuiting in accordance with NA4. NA. Checking the Wiring
^ Continue with Checking the EGR temperature sensor signal FL4.

FL4




Checking the EGR temperature sensor signal
If the signal wiring has been short circuited the EGR temperature sensor may have broken. Check the EGR temperature sensor In accordance with the following.
- Connect the connector to the EGR temperature sensor.
- Switch on the ignition.
- Delete the DTC.
Measure between terminals 1 and 2 on the EGR temperature sensor connector with a voltmeter.

If the voltmeter reads approx. 5 V
^ the temperature sensor is faulty. Try using a new temperature sensor (PTC type).