ABOVE UPPER LIMIT (FRA)
Test results
1
CHECK ON SEEPAGE IN EXHAUST MANIFOLD
All OK
Problems encountered
Operation
Check for the presence of any seepage in the exhaust manifold.
Go to Step 2
Seepage inside the exhaust manifold.
Restore correct operation
2
PRESSURE SENSOR CHECK
Check that the pressure sensor is working properly by carrying out the
See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR
Go to Step 3
Pressure sensor not working properly.
Replace the pressure sensor
Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
3
SENSOR CONDITION CHECK
Check for the presence of any oil or oxidation on the sensitive element or impact to the sensor casing. Also check that it is correctly fitted.
Go to Step 4
Sensor fouled, contaminated or not correctly installed.
Clean the sensor or fit it correctly.
4
LAMBDA SENSOR OPERATION CHECK
Check that the Lambda sensor is working properly by performing the
See Test 1080BA Check on the operation of the upstream Lambda sensor
Go to Step 5
Lambda sensor not working properly.
Replace the Lambda sensor
Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R
5
ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK
Check that the engine management control unit is working properly.
End of diagnosis
Engine management control unit faulty.
Replace the engine management control unit
Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
BELOW LOWER LIMIT (FRA)