Dtc P0703 [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Is the variable intake-air solenoid valve
normal?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
5
• Inspect for poor connection at terminal 2AJ.
(such as damaged/pulled-out pins, corrosion).
• Is there malfunction?
INSPECT VARIABLE INTAKE-AIR
SOLENOID VALVE CONTROL CIRCUIT
SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
6
• Measure the voltage between variable intake-
air solenoid valve terminal A (wiring harness-
side) and body ground.
• Is the voltage B+?
VERIFY TROUBLESHOOTING OF DTC
P0662 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
7
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Access RPM PID.
• Increase the engine speed 4,750 rpm or
more for 10 times.
• Is the same DTC present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
8
(See AFTER REPAIR PROCEDURE
• Are any DTC present?
DTC P0703
Downloaded from
[LF].)

DTC P0703 [LF]

Brake switch input circuit problem
https://carmanualshub.com/
Yes Repair the terminal, then go to Step 7.
No Go to the next step.
Repair or replace the wiring harness for
Yes short to power supply, then go to the next
step.
No Go to the next step.
Replace the PCM, then go to the next step.
Yes
(See PCM REMOVAL/INSTALLATION
[LF].)
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [LF].)
No Troubleshooting completed.
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B3E010201089W01