Upstream lambda sensor operation check
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Emission control system › Upstream lambda sensor operation check
UPSTREAM LAMBDA SENSOR OPERATION CHECK
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Turn the ignition key OFF. Disconnect the wiring harness from the lambda sensor on the preconverter and from engine control unit connector A. Turn the ignition key ON. Measure the voltage between Pin 1 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 2 | Turn the ignition key OFF. Check that the resistance between Pin 1 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 3 | Measure the resistance between Pin 1 (wiring side) of the sensor and Pin 65 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 4 | Turn the ignition key ON. Measure the voltage between Pin 5 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 5 | Turn the ignition key OFF. Check that the resistance between Pin 5 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 6 | Measure the resistance between Pin 5 (wiring side) of the sensor and Pin 87 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 7 | Turn the ignition key ON. Measure the voltage between Pin 2 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 8 | Turn the ignition key OFF. Check that the resistance between Pin 2 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 9 | Measure the resistance between Pin 2 (wiring side) of the sensor and Pin 86 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 10 | Turn the ignition key ON. Measure the voltage between Pin 6 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 11 | Turn the ignition key OFF. Check that the resistance between Pin 6 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 12 | Measure the resistance between Pin 6 (wiring side) of the sensor and Pin 64 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 13 | Replace the Lambda sensor Op. 1080B90 LAMBDA SENSOR - R.R. and check the fault has disappeared | Repair the original lambda sensor and replace the engine management control unit. |
| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK | |
|---|---|---|
| 1 | Turn the ignition key OFF. Disconnect the cable loom from the lambda sensor. Disconnect the wiring harness connector from engine control unit connector B. Turn the ignition ON. Turn the ignition key ON. Measure the voltage between Pin 1 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 2 | Turn the ignition key OFF. Check that the resistance between Pin 1 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 3 | Measure the resistance between Pin 1 (wiring side) of the sensor and Pin 47 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 4 | Turn the ignition key ON. Measure the voltage between Pin 5 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 5 | Turn the ignition key OFF. Check that the resistance between Pin 5 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 6 | Disconnect the wiring harness connector from engine control unit connector B Disconnect the cable loom connector from the engine management control unit connector A. Measure the resistance between Pin 5 (wiring side) of the sensor and Pin 80 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 7 | Turn the ignition key ON. Measure the voltage between Pin 2 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 8 | Turn the ignition key OFF. Check that the resistance between Pin 2 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 9 | Disconnect the wiring harness connector from engine control unit connector A Disconnect the wiring harness connector from engine control unit connector B Measure the resistance between Pin 2 (wiring side) of the sensor and Pin 45 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 10 | Turn the ignition key ON. Measure the voltage between Pin 6 (wiring side) of the sensor and earth is less than 0.3 V. | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 11 | Turn the ignition key OFF. Check that the resistance between Pin 6 (wiring side) of the sensor and earth is greater than 500 kOhms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 12 | Measure the resistance between Pin 6 (wiring side) of the sensor and Pin 46 (wiring side) of the control unit is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. |
| 13 | Replace the Lambda sensor Op. 1080B90 LAMBDA SENSOR - R.R. and check the fault has disappeared | Repair the original lambda sensor and replace the engine management control unit. |
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