Checking the supply voltage - Figure 25
Technical conditions
| Contacts | Voltage |
| 1 and mass | battery |
Make sure the ignition is off.
Disconnect the oxygen sensor electrical connector.
Start the engine at idle speed.
Measure the voltage between the wiring connector terminal and ground.
Check the second oxygen sensor heater.
Checking the ground circuit - Figure 25
Technical conditions
| Contacts | Resistance |
| 3 and mass | Zero |
Make sure the ignition is off.
Disconnect the oxygen sensor electrical connector.
Measure the resistance between the oxygen sensor connector terminal and ground.
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