2. Measure the oxygen sensor feedback voltage.
a) Connect the positive lead of the voltmeter to the "VF1" terminal of the diagnostic connector and the negative lead to the "E1" terminal and perform the test according to the algorithm given on the next page.
3. Measure the resistance of the oxygen sensor heater by connecting an ohmmeter to the "+B" and "HT" terminals.
- Nominal resistance (at t = 20°C) — 11.7-14.3 Ohm
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If the resistance value is outside the specified range, replace the oxygen sensor.