Mazda 6 2002, Workshop Manual

Page: 185 / 1248

F–56
CONTROL SYSTEM
KNOCK SENSOR INSPECTION
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Note
•
Perform the following test only when directed.
Resistance Inspection
1. Turn the ignition switch to LOCK.
2. Disconnect the knock sensor connector.
3. Measure the resistance between the knock sensor terminals A and B using an ohmmeter.
•
If not as specified, replace the knock sensor.
•
If the knock sensor is okay, but PID value is out of specification, perform the “Circuit Open/Short
Inspection”.
Specification
Approx. 4.87 megohms
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See F–43 PCM
REMOVAL/INSTALLATION .)
2. Inspect the following wiring harnesses for open or
short. (Continuity check)
Open circuit
•
If there is no continuity, the circuit is open. Repair
or replace the harness.
— Knock sensor terminal A (harness-side) and
PCM terminal 2S (harness-side)
— Knock sensor terminal B (harness-side) and
PCM terminal 2P (harness-side)
Short circuit
•
If there is continuity, the circuit is shorted. Repair
or replace the harness.
— Knock sensor terminal A (harness-side) and power supply
— Knock sensor terminal A (harness-side) and body GND
— Knock sensor terminal B (harness-side) and power supply
— Knock sensor terminal B (harness-side) and body GND
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KNOCK SENSOR REMOVAL/INSTALLATION
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1. Remove the intake manifold. (See F–10 INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
2. Remove the knock sensor attachment bolt to
remove the knock sensor.
3. Install in the reverse order of removal.
Tightening torque
16.2—23.8 N·m
{1.66—2.42 kgf·m, 12.0—17.5 ft·lbf}
End Of Sie
HEATED OXYGEN SENSOR (HO2S) INSPECTION
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HO2S Voltage Inspection
Note
•
Perform the following inspection only when directed.
1. Warm up the engine and run it at idle.
2. Disconnect the HO2S connector.
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