Protege LX L4-1.6L DOHC (2000)
Oxygen Sensor: Testing and Inspection
Voltage Inspection
H02S (Front and Rear) Voltage Inspection
NOTE: Perform the following test only when directed.
1. Warm up the engine and run it at idle.
2. Disconnect the H02S (Front or Rear) connector.
3. Connect the voltmeter test leads to the following H02S terminals:
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(+) lead-H02S terminal A
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(-) lead-H02S terminal B
4. Run the engine at 3,000 rpm until the voltmeter indicates approx. 0 - 1.0 V.
Specification
5. Verify that the voltmeter needle moves when the engine speed increases and decreases suddenly several times.
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If not as specified, replace the H02S.
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If the H02S is okay, but PID value or PCM terminal 60 (Front), 35 (Rear) voltage are out of specification, carry out the "Circuit Open/Short
Inspection".
Circuit Open/Short Inspection
1. Remove the PCM.
2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.
Tightening torque
7.9 - 10.7 N.m {80 - 110 kgf.cm, 69.5 - 95.4 in.lbf}
4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals
with ohmmeter leads.
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If there is an open or short circuit, repair or replace wiring harnesses.
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If there is no open or short circuit, replace the HO2S.
Open circuit