| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| First, check:- condition of the air filter;
- battery correctly fastened to earth; (Wiring Diagram ) E1010 POWER SUPPLY
| Move on to Step | 1. Filter element dirty, damaged or not correctly fitted | 1. Replace or restore the correct filter element fitting See in Op. 1048A14 air cleaner filtering element - replace. |
| 2. Fastening to earth incofrect | 2. Restore wiring |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check:- that there are no faults in the engine management control unit;
- parameter plausibility
| Move on to Step | 1. "Fuel system" error detected | 1. Continue following the instructions in Table Z050 |
| 2. "Upstream Lambda sensor" error detected | 2. Continue following the instructions in Table Z056 |
| 3. Another error detected in the control unit | 3. Continue following the instructions for the diagnostic equipment |
| 4. Parameter not consistent | 4. Continue following the instructions for the diagnostic equipment |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected.Check:- that there are no faults in the engine management control unit;
- parameter plausibility
| Move on to Step | 1. "Fuel system" error detected | 1. Continue following the instructions in Table Z050 |
| 2. "Upstream Lambda sensor" error detected | 2. Continue following the instructions in Table Z056 |
| 3. The sudden onset of another error in the control unit is detected | 3. Continue following the instructions for the diagnostic equipment |
| 4. Parameter not consistent | 4. Continue following the instructions for the diagnostic equipment |
| 3 | FUEL PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the fuel supply pressure, if necessary on the road (to reproduce the conditions in which the problem occurs) See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE | Move on to Step | 1. Pressure not correct: obstructions in the fuel supply pipe | 1. Remove the obstructions in the fuel pipe, replace it if necesary |
| 2. Pressure not correct: petrol pump damaged | 2. Replace the petrol pump assembly See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. |
| 4 | AIR CONDITIONING SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Road test the vehicle, checking that the irregular behaviour does not occur when the air conditioning is switched on or off | Move on to Step | Fault only present with the air conditioning switched on | Continue following the instructions in Table L010 |
| 5 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | | Fault persists control unit defective | Replace the control unit See in Op. 1056B52 Air flow meter ELECTRONIC MODULE - R.R. |