BELOW THRESHOLD (short circuit to GND)
Test results
1
CHECK ON CONNECTIONS AT TURBOCHARGING AIR BY-PASS SOLENOID AND AT ENGINE MANAGEMENT CONTROL UNIT
All OK
Problems encountered
Operation
Check for the presence of loose connections at the turbocharging air by-pass solenoid and at the engine management control unit
Go to Step 2
Presence of loose connections
Restore the correct connections.
2
WIRING INSULATION CHECK
Check that the wiring is correctly insulated
Go to Step 3
Wiring insulation not correct
Restore correct insulation
3
TURBOCHARGING AIR BY-PASS SOLENOID OPERATION CHECK
Check that the turbocharging air by-pass solenoid is working properly
See Test 1064BH CHECK ON OPERATION OF SUPERCHARGING AIR BY-PASS SOLENOID VALVE (SHUT OFF)
Go to Step 4
Solenoid not working properly.
Replace the by-pass solenoid
Op. 1048B58 TURBOCHARGER AIR BY-PASS VALVE - R.R.
4
ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK
Check that the engine management control unit is working properly
End of diagnosis
Engine management control unit not working properly
Replace the engine management control unit
Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
BELOW THRESHOLD (short circuit to Vbatt)
NO SIGNAL (open circuit)
1. Wiring insulation not correct
2. Breaks in the wiring
1. Restore correct insulation
2. Restore the correct wiring.
EARTH CONNECTIONS CHECK
Check for the presence of unstable earth connections
Earth connections unstable
Restore the correct earth connections.
5