Workshop Manuals Factory service & repair Alfa Romeo
01 General information02 Specifications03 Manufacturing data and tolerances04 Tightening torques05 Fluids and lubricants06 Maintenance07 Diagnostic checks08 Engine09 Clutch10 Gearbox and differential11 Transmission (4x4)12 Axles and driveshafts13 Brakes14 Steering15 Suspension and wheels16 Heating, air conditioning and auxiliary units17 Electrical equipment18 Body fittings19 Body panels and frame20 Wiring diagrams and electrical functions21 Wiring harnesses22 Connectors and pin-outs23 Fault diagnosis24 Special tools
Alfa Romeo Brera and Spider Factory Service Manual (2005-2010)23 · Fault diagnosis
23 · Diagnostics

Engine knocking

Make
Alfa Romeo
Model
Brera and Spider Factory Service Manual
Year
2005–2010
Section
Noise / vibrations › Engine knocking
Fault diagnosisEngine knocking

ENGINE KNOCKING

2.4 JTD 20v

The customer complains of: Irregular combustion noise, engine knock

Results of the tests
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

Check that the engine oil level is correct

Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY

Check that the air intake/vacuum circuit is working properly by carrying out the

See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK

Check the condition of the fuel supply circuit and make sure that it is working properly carrying out the

See Test 1040OA FUEL SUPPLY CIRCUIT CHECK

Check the operation of the low pressure supply circuit by carrying out the

See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT

Move on to Step 1Oil level incorrect

Restore the correct engine oil level

Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY

1AMBIENT PARAMETERS CHECKAll OKProblems encounteredOperation

Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.

Check the value of the following parameters:

. Battery voltage

See Test 5530BB BATTERY VOLTAGE CHECK

. Atmospheric pressure

See Test 1060GD ATMOSPHERIC PRESSURE CHECK

. Air temperature in the intake manifold

See Test 1064BD SUPERCHARGING TEMPERATURE CHECK

. Supercharging pressure Objective

. Supercharging pressure Measured

See Test 1060GF

. Measured air mass

See Test 1060GG MEASURED AIR MASS CHECK

. Engine coolant temperature

See Test 1060OE CHECK ON OPERATION OF COOLANT TEMPERATURE SENSOR

. Diesel temperature

See Test 1060EA DIESEL FUEL TEMPERATURE CHECK

. Objective Diesel pressure

. Measured Diesel pressure

See Test 1060GH DIESEL FUEL PRESSURE CHECK

. Engine rpm

See Test 1060GI ENGINE SPEED CHECK

Move on to Step 2
2PREHEATING RELAY ACTIVE DIAGNOSISAll OKProblems encounteredOperation

Carry out the active diagnosis for the preheating relay, checking that the result is positive.

The check on the following system is only necessary if the outside temperature is below 0 °C.

End of diagnosisThe result of the active diagnosis is negativeMove on to Step 3
3HEATER PLUGS CHECKAll OKProblems encounteredOperation

Check that the heater plugs are working properly

See Test 5520CA GLOW PLUGS FUNCTIONAL TEST

End of diagnosis

Parts & tools for this job Staging For 2005 Alfa Romeo Brera

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