Mazda 3 - Page 86

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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86
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
• Has FREEZE FRAME DATA been
recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the
available repair information.
• If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
INSPECT ECT SENSOR CONNECTOR
FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the ECT sensor connector.
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step
8.
No
Go to the next step.
4
INSPECT ECT SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between ECT sensor
terminal A (wiring harness-side) and body
GND.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a
possible short to power supply, then go to
Step 8.
No
Go to the next step.
5
INSPECT ECT SENSOR
• Inspect the ECT sensor.
(See ENGINE COOLANT TEMPERATURE
(ECT) SENSOR INSPECTION [Z6].)
• Is there any malfunction?
Yes
Replace the ECT sensor, then go to Step 8.
(See ENGINE COOLANT TEMPERATURE
(ECT) SENSOR REMOVAL/INSTALLATION
[Z6].)
No
Go to the next step.
6
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step
8.
No
Go to the next step.