9 Fast Idle/Runs On [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Inspect variable valve timing control
system operation.
(See Variable Valve Timing Control
System Operation
Does variable valve timing control
system work properly?
Is engine compression correct?
22
(See COMPRESSION INSPECTION
[Z6].)
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
23
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.9 FAST IDLE/RUNS ON [Z6]
9
• The engine speed continues during at fast idle after warm-up.
DESCRIPTION
• The engine runs after the ignition switch is off.
• ECT sensor malfunction
• Air leakage from intake-air system
• Throttle body malfunction
POSSIBLE CAUSE
• Accelerator cable free play misadjustment
• Improper load signal input
Diagnostic procedure
STEP INSPECTION
Downloaded from
No
Inspection.)
Yes
No
FAST IDLE/RUNS ON
RESULTS
https://carmanualshub.com/
Repair or replace the malfunctioning part.
Remove EGR valve and visually inspect for
mechanically stuck EGR valve.
If there is no malfunction, inspect valve
timing.
(See Timing Chain Installation
Inspect for cause.
[Z6].)
[Z6].)
ACTION
- automotive repair manuals website
Note.)
B3E010318881W42