Mazda CX-9 Grand Touring 2009 Manual page 1029

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
INSPECT FOR PROPER CKP BIAS
VOLTAGES IN PCM
Disconnect the CKP sensor connector.
Turn the ignition switch to the ON position
(Engine off)
6
Measure the voltage between:
CKP sensor terminal A on the wiring
harness side and battery negative
CKP sensor terminal B on the wiring
harness side and battery negative
Are the voltages between 1-3 V?
INSPECT CKP SENSOR RESISTANCE
Turn the ignition switch off.
7 Measure the resistance between CKP
sensor terminal A and B on the component
side.
Is the resistance between 0.25-1 kilohms?
INSPECT CKP WIRING HARNESS SHIELD
CIRCUIT FOR SHORT TO GROUND
NOTE:
The wiring harness shield protects the
CKP signal from electrical noise and is
grounded at one end, typically near the
PCM.
NOTE:
8
Perform the following resistance
measurement between the CKP shield
and the ground.
Measure the resistance between:
CKP_SHLD assembly connector
wiring harness side and ground
Is the resistance less than 5 ohms?
INSPECT FOR SHORT BETWEEN CKP (+)
AND CKP (-) IN WIRING HARNESS
9
Turn the ignition switch off.
Disconnect the PCM connector.
2008 Mazda CX-9 Grand Touring
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Go to the next step.
Go to Step 8.
Replace the CKP sensor. Then go to Step
13.
Repair the short circuit. Check for a poor
ground. Then go to Step 13.