Mazda 3 - Page 70

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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4
INSPECT MAF SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between MAF/IAT
sensor terminal C (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 MAF SENSOR
• Inspect the MAF sensor.
(See MASS AIR FLOW (MAF) SENSOR
INSPECTION [Z6].)
• Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to Step
8.
(See MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) 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.
7
INSPECT MAF SENSOR GND CIRCUIT
FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between MAF/IAT
sensor terminal B (wiring harness-side) and
PCM terminal 2BC (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a
possible open circuit, then go to the next
step.
8
VERIFY TROUBLESHOOTING OF DTC
P0103 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [Z6].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR
PROCEDURE".
(See AFTER REPAIR PROCEDURE [Z6].)
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [Z6].)
No
DTC troubleshooting completed.