Mazda 3 Workshop Manual page 373

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(See VARIABLE INTAKE-AIR SOLENOID VALVE
INSPECTION [LF].)
• Is variable intake-air solenoid valve normal?
INSPECT VARIABLE INTAKE-AIR SOLENOID
VALVE POWER SUPPLY CIRCUIT FOR OPEN
CIRCUIT
• Turn the ignition switch to the ON position
(Engine off).
5
• Measure the voltage between variable intake-air
solenoid valve terminal B (wiring harness-side) and
body ground.
• Is the voltage B+?
INSPECT VARIABLE INTAKE-AIR SOLENOID
VALVE CONTROL CIRCUIT FOR SHORT TO
GROUND
• Inspect for continuity between variable intake-air
6
solenoid valve terminal A (wiring harness-side) and
body ground.
• Is there continuity?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Disconnect the PCM connector.
7
• Inspect for poor connection at terminal 2AJ.
(damaged/pulled-out pins, corrosion, etc.).
• Is there malfunction?
INSPECT VARIABLE INTAKE-AIR SOLENOID
VALVE CONTROL CIRCUIT FOR OPEN
• Inspect for continuity between variable intake-air
8
solenoid valve terminal B (wiring harness-side) and
PCM terminal 2AJ (wiring harness-side).
• Is there continuity?
VERIFY TROUBLESHOOTING OF DTC P0661
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
9
• 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.
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Yes Go to the next step.
Repair or replace the wiring harness for
No
open, then go to Step 9.
Repair or replace the wiring harness for
Yes
short to ground, then go to Step 9.
No Go to the next step.
Yes Repair the terminal, then go to Step 9.
No Go to the next step.
Yes Go to the next step.
Repair or replace the wiring harness for
No
open circuit, then 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.
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