Mazda 6 2002, Workshop Manual

Page: 183 / 1248

F–54
CONTROL SYSTEM
— ECT sensor terminal B (harness-side) and power supply
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CRANKSHAFT POSITION (CKP) SENSOR INSPECTION
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Note
•
Perform the following inspection only when directed.
Resistance Inspection
1. Disconnect the CKP sensor connector.
2. Measure the resistance between CKP sensor terminals A and B using an ohmmeter.
•
If not as specified, replace the CKP sensor.
•
If CKP sensor resistance is okay, but RPM PID value is out of specification, perform the “Circuit Open/Short
Inspection”.
Specification
400—550 ohms
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.
— CKP sensor terminal A (harness-side) and
PCM terminal 2D (harness-side)
— CKP sensor terminal B (harness-side) and
PCM terminal 2G (harness-side)
Short circuit
•
If there is continuity, the circuit is shorted. Repair
or replace the harness.
— CKP sensor terminal A (harness-side) and power supply
— CKP sensor terminal A (harness-side) and body GND
— CKP sensor terminal B (harness-side) and power supply
— CKP sensor terminal B (harness-side) and body GND
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CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION
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Removal
1. Perform the following procedure to making the working space.
(1) Remove the Front wheel (RH).
(2) Remove the splash shield.
2. Disconnect the CKP sensor connector.
3. Remove the installation bolts to remove the CKP sensor.
Installation
Caution
•
When foreign material such as an iron chip is on the CKP sensor, it can cause abnormal output
from the sensor because of flux turbulence and adversely affect the engine control. Be sure there
is no foreign material on the CKP sensor when replacing.
1. Perform the following procedure so that piston No.1 is at the top dead center.
(1) Remove the front driveshaft (RH). (See M–17 DRIVE SHAFT REMOVAL/INSTALLATION .)
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