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Fiat Croma Factory Service Manual (2005-2010)22 · Fault diagnosis
22 · Diagnostics

P0402 - EGR valve

Make
Fiat
Model
Croma Factory Service Manual
Year
2005–2010
Section
Examiner - electronic diesel management › P0402 - EGR valve
Fault diagnosisP0402 - EGR valve

P0402 - EGR VALVE

1.9 JTD 8v, 1.9 JTD 16v, 2.4 JTD 20v

The diagnostic equipment signals: Error P0402 (EGR valve).

This error is detected if the quantity of exhaust gas recirculation is too high.

As a result, the exhaust gas recirculation valve is switched off and the supercharging pressure can longer be controlled and the quantity of fuel injected is reduced.

0Preliminary checksALL OKPROBLEMS ENCOUNTEREDACTION

Check the seal of the inlet/supercharging system hoses.

Check the hoses and connected pipes to identify any obstructions, damage etc.

Check that the pipe restriction bands in the air intake/inlet system are correctly fitted.

Move on to Step 1Connections faulty, obstructions or porousnessRenew or, if necessary, replace the faulty components
1Check using diagnostic equipmentALL OKPROBLEMS ENCOUNTEREDACTION

Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system and check the following parameters:

  • Air temperature in the intake manifold

See Test 1064BD SUPERCHARGING TEMPERATURE CHECK

  • Supercharging pressure Objective
  • Supercharging pressure Measured

See Test 1060GF SUPERCHARGING PRESSURE CHECK

  • Measured air mass

See Test 1060GG MEASURED AIR MASS CHECK

End of diagnosis

Parts & tools for this job For 2005 Fiat Croma

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