Mazda 3 Workshop Manual page 70

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
INSPECT MAF SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
4
• Measure the voltage between MAF/IAT
sensor terminal C (wiring harness-side) and
body GND.
• Is the voltage B+?
INSPECT MAF SENSOR
• Inspect the MAF sensor.
5
(See MASS AIR FLOW (MAF) SENSOR
INSPECTION [Z6].)
• Is there any malfunction?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
6
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
INSPECT MAF SENSOR GND CIRCUIT
FOR OPEN CIRCUIT
• Turn the ignition switch off.
7
• Inspect for continuity between MAF/IAT
sensor terminal B (wiring harness-side) and
PCM terminal 2BC (wiring harness-side).
• Is there continuity?
VERIFY TROUBLESHOOTING OF DTC
P0103 COMPLETED
• Make sure to reconnect all disconnected
connectors.
8
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR
9
PROCEDURE".
(See AFTER REPAIR PROCEDURE
Downloaded from
[Z6].)
https://carmanualshub.com/
Repair or replace the wiring harness for a
Yes possible short to power supply, then go to
Step 8.
No Go to the next step.
Replace the MAF/IAT sensor, then go to Step
8.
Yes
(See MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION
No Go to the next step.
Repair or replace the terminal, then go to
Yes
Step 8.
No Go to the next step.
Yes Go to the next step.
Repair or replace the wiring harness for a
No possible open circuit, then go to the next
step.
Replace the PCM, then go to the next step.
Yes
(See PCM REMOVAL/INSTALLATION
No Go to the next step.
Go to the applicable DTC inspection.
Yes
(See DTC TABLE [Z6].)
No DTC troubleshooting completed.
- automotive repair manuals website
[Z6].)
[Z6].)