Mazda 3 Workshop Manual page 295

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
STEP
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
1
• Has FREEZE FRAME DATA been recorded?
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
2
availability.
• Is any related repair information available?
INSPECT POOR CONNECTION OF ECT
SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect ECT sensor connector.
3
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
CLASSIFY ECT SENSOR MALFUNCTION
OR WIRING HARNESS MALFUNCTION
• Connect the WDS or equivalent to the DLC-
2.
• Access ECT PID.
4
• Connect a jumper wire between ECT sensor
terminals A and B.
• Verify the ECT value.
• Is the voltage 4.6 V or below?
INSPECT ECT SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER
• Turn the ignition switch to the ON position
(Engine off).
5
• Measure the voltage between ECT sensor
terminal A (wiring harness-side) and body
ground.
• Is the voltage B+?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Disconnect the PCM connector.
6
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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INSPECTION
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ACTION
Yes Go to the next step.
Record the FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform repair or diagnosis according to the
available repair information.
Yes
• If the vehicle is not repaired, go to the next
step.
No Go to the next step.
Repair or replace the terminal, then go to
Yes
Step 9.
No Go to the next step.
Yes Replace the ECT sensor, then go to Step 9.
No Go to the next step.
Repair or replace the wiring harness for
Yes
short to power supply, then go to Step 9.
No Go to the next step.
Repair or replace the terminal, then go to
Yes
Step 9.
No Go to the next step.
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