CX-7 L4-2.3L Turbo (2007)
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
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If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
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Rear HO2S terminal A and PCM terminal 2Q
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Rear HO2S terminal B and PCM terminal 1BC
Short circuit
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If there is continuity, there is a short circuit. Repair or replace the wiring harness.
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Rear HO2S terminal A and body ground
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Rear HO2S terminal A and power supply
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Rear HO2S terminal B and power supply
Rear HO2S Heater Resistance Inspection
1. Disconnect the rear HO2S connector.
2. Measure the rear HO2S resistance between terminals C and D.
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If not within the specification, replace the HO2S.
Rear HO2S heater resistance 2-50 ohms
Rear HO2S Circuit Open/Short Inspection (Heater)
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)