Dtc P0668 [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Inspect for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
INSPECT VARIABLE INTAKE-AIR SHUTTER
VALVE ACTUATOR CIRCUIT FOR OPEN
CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following
circuits:
- Variable intake-air shutter valve
8
actuator terminal A (wiring harness-
side) and PCM terminal 2AO (wiring
harness-side)
- Variable intake-air shutter valve
actuator terminal B (wiring harness-
side) and PCM terminal 2AS (wiring
harness-side)
• Is there continuity?
VERIFY TROUBLESHOOTING OF DTC
P0660 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
9
• Start the engine.
• Access the RPM PID.
• Increase the engine speed 4,100 rpm or
more.
• Is the same DTC present?
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
10
(See AFTER REPAIR PROCEDURE
• Are any DTCs present?
DTC P0668
Downloaded from
[Z6].)

DTC P0668 [Z6]

PCM temperature sensor circuit low input
https://carmanualshub.com/
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
[Z6].)
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [Z6].)
No Troubleshooting completed.
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B3E010200600W04