DTC 1-5-4

FD. Diagnostic trouble code (DTC) 1-5-4 DI EZ 116 K

* 1-5-4 EGR system flow too high







DTC conditions
- Cold engine (temperature lower than 6500 (i 490 F)).
- Rising temperature indicated by the temperature sensor (decreasing signal level).
If the control module detects the EGR temperature sensor signal level changing by more than the default (temperature dependent) values before the engine temperature has reached 65°C (149°F), the control module interprets this as an EGR flow and a DTC is logged.

Causes of fault:
- Faulty EGR valve (leak)
- False signal to the EGR vacuum controller
- Faulty EGR vacuum controller
- Poor connection to GND
- Fault in the engine thermostat

Fault symptoms:
- The engine may idle unevenly

Important! Be careful when removing yellow and white hoses. The hoses may burst or crack if they are removed roughly from nipples.

FD1




Checking the Idling
- Start the engine and listen to it running.

If the engine idles unevenly
^ check the signal wiring FD2.

If the engine idles evenly
^ check the engine temperature FD5.

FD2




Checking the signal wiring Engine idling.
Disconnect the connector from the EGR vacuum controller.

If the engine still idles unevenly
^ check the EGR vacuum controller FD3.

If the engine now idles evenly
^ check the wiring between terminal 15 on the control module and terminal-1 on the EGR vacuum controller for grounding in accordance with NA3. NA. Checking the Wiring

FD3




Checking the EGR vacuum controller
- Engine idling.
Carefully remove the yellow hose from the EGR vacuum controller.

If the engine still idles unevenly
^ check the yellow hose FD4.

If the engine now idles evenly
^ try using a new EGR vacuum controller.

FD4




Checking the yellow hose
- Engine idling.
Carefully remove the yellow hose at the EGR valve.

If the engine now idles evenly
^ try using a new hose.

If the engine still idles unevenly
^ try using a new EGR valve.

FD5




Checking the engine temperature
- Engine mrunning Check that:
1) the engine temperature rises normally.
2) the temperature gauge needle points straight up (90°) and that the upper radiator hose is hot.

If engine temperature rises slowly and the needle of the temperature gauge does not point straight up
^ try using a new engine thermostat.

If engine temperature is normal
^ check the connectors FD6.

FD6




Checking connectors
Contact resistance in the EGR and ECT sensor connectors can cause a DTC to be logged.
- Switch off the ignition.
- Clean the EGR and ECT sensor connectors and treat them for corrosion in accordance with NA7. NA. Checking the Wiring
- Remove the GND terminal (at the intake manifold), clean it and reinstall it.