6
INSPECT FOR PROPER CKP BIAS
VOLTAGES IN PCM
z
Disconnect the CKP sensor connector.
z
Turn the ignition switch to the ON position
(Engine off)
z
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
z
Are the voltages between 1-3 V?
Yes Go to the next step.
No
Go to Step 8.
7
INSPECT CKP SENSOR RESISTANCE
z
Turn the ignition switch off.
z
Measure the resistance between CKP
sensor terminal A and B on the component
side.
z
Is the resistance between 0.25-1 kilohms?
Yes Go to the next step.
No
Replace the CKP sensor. Then go to Step
13.
8
INSPECT CKP WIRING HARNESS SHIELD
CIRCUIT FOR SHORT TO GROUND
z
Measure the resistance between:
{
CKP_SHLD assembly connector
wiring harness side and ground
z
Is the resistance less than 5 ohms?
NOTE:
z
The wiring harness shield protects the
CKP signal from electrical noise and is
grounded at one end, typically near the
PCM.
NOTE:
z
Perform the following resistance
measurement between the CKP shield
and the ground.
Yes Go to the next step.
No
Repair the short circuit. Check for a poor
ground. Then go to Step 13.
9
INSPECT FOR SHORT BETWEEN CKP (+)
AND CKP (-) IN WIRING HARNESS
z
Turn the ignition switch off.
z
Disconnect the PCM connector.
Yes Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:37 AM
Page 165
© 2005 Mitchell Repair Information Company, LLC.
