Check measured air mass
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Diesel injection system › Check measured air mass
CHECK MEASURED AIR MASS
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Turn the ignition key ON. With the engine off and all users off the measured Air Mass must be in a range between 0 and 1 kg/h | Move on to Step 5 |
| 2 | With the engine idling and warmed up, with the EGR valve closed and accelerator pedal not operated, the measured Air Mass must be in a range between 40 and 60 kg/h | Move on to Step 5 |
| 3 | With all users off, when the accelerator pedal is pumped several times, the measured Air Mass must be seen to alter in a short time. | Move on to Step 5 |
| 4 | With the EGR Valve open and accelerator pedal not operated, the Measured Air Mass must be in a range between 20 and 40 kg/h. The test may be said to be completed | Move on to Step 5 |
| 5 | Turn the ignition key OFF. Disconnect the wiring harness connector from the air flow meter. Turn the ignition key ON. Measure the voltage between Pin 1 (wiring side) of the gauge and Earth, ensuring it is greater than 11 V. Move on to Step 7 | Move on to Step 6 |
| 6 | If faults are present, repair or if necessary replace the electrical wiring between the engine compartment junction unit and the debimeter. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 7 | Measure the voltage between Pins 1 and 2 (wiring side) of the gauge and Earth, ensuring it is greater than 11 V. Move on to Step 9 | Move on to Step 8 |
| 8 | If faults are present, repair or if necessary replace the electrical wiring between the engine control unit and the debimeter. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine management control unit |
| 9 | Measure the voltage between Pin 4 (wiring side) of the gauge and Earth, ensuring it is in a range between 4.8 and 5.2 V. | Move on to Step 8 |
| 10 | Replace the debimeter and check the fault has disappeared | Repair the original debimeter and replace the engine management control unit. |
| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
|---|---|---|
| 1 | With the engine idling and warmed up, with the EGR valve closed and accelerator pedal not operated, the measured Air Mass must be in a range between 10 and 22 kg/h | Move on to Step 4 |
| 2 | With all the appliances off, the measured air mass must be greater than 20 kg/h when the accelerator pedal is operated slightly. | Move on to Step 4 |
| 3 | When the accelerator pedal is left without operating for at least 70 seconds, the measured air mass must be in a range between 25 and 35 kg/h. The test can be considered over | Move on to Step 4 |
| 4 | Check the tightening and connections of the oil dipstick and the engine oil filler cap Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY | Restore the seal and tightness |
| 5 | Check that the seal of the intake/turbo system hoses is efficient (secondary air, blockages and porosity) Check that the pipe restriction bands in the air intake/inlet system are correctly fitted. Check the hoses and connected pipes to identify any obstructions, damage etc. | Repair the faulty connections/components |
| 6 | Check that the air filter is not contaminated and is correctly fitted | Clean or, if necessary, replace the wiring |
| 7 | Check that the exhaust system components are correctly fastened | Repair the faulty connections/components |
| 8 | Check that the EGR valve is working properly by carrying out the | |
| 9 | Turn the ignition key to the OFF position. Disconnect the wiring harness connector from the air flow meter. Measure the voltage across gauge Pin 2 and Earth, checking it is greater than 11 V Move on to Step 16 | Move on to Step 10 |
| 10 | Remove fuse F59 (second from the left on the second row from the bottom) from the engine compartment junction unit and check it has not blown. Move on to Step 14 | Move on to Step 11 |
| 11 | Turn off all the electrical users. Release any gear (neutral) Fit a new fuse F59 and check it does not blow. | Repair or if necessary replace the electrical wiring between the engine compartment junction unit and the debimeter |
| 12 | Engage reverse and check tha fuse F59 does not blow | Replace the reversing light relay |
| 13 | Replace the debimeter Op. 1060G10 AIR FLOW METER - R.R. The test can be considered over | |
| 14 | Measure the voltage between fuse F59 input contact and earth, checking it is greater than 11 V | Restore the correct electrical connections in the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT If necessary, replace it Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 15 | Repair or if necessary replace the electrical wiring between the engine compartment junction unit and the debimeter See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | |
| 16 | Measure the voltage between gauge Pins 2 and 3 checking that it is less than 11 Ohm. Move on to Step 18 | Move on to Step 17 |
| 17 | If faults are present, repair or if necessary replace the electrical wiring between the debimeter and the engine control unit. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the engine management control unit |
| 18 | Measure the voltage across gauge Pin 4 and the earth, checking that it is in a range between 4.8 and 5.2 V | Move on to Step 17 |
| 19 | Replace the debimeter Op. 1060G10 AIR FLOW METER - R.R. and check the fault has disappeared | Repair the original debimeter and replace the engine management control unit. |
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