12 Lack/Loss Of Power-Acceleration/Cruise [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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.
21
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION
NO.12 LACK/LOSS OF POWER-
ACCELERATION/CRUISE [LF]
12
DESCRIPTION Performance is poor under load (such as power down when climbing hills).
• Improper A/C system operation
• Erratic signal or no signal from CMP sensor
• Air leakage from intake-air system parts
• Restriction in intake-air system
• Intake-air temperature too hot
• Improper variable intake-air control operation
• Improper variable tumble control operation
• Purge valve malfunction
POSSIBLE
• Improper EGR valve operation
CAUSE
• Brake dragging
• Erratic signal from CKP sensor
• Low engine compression
• Vacuum leakage
• Poor fuel quality
• Erratic signal to ignition coil
• Engine overheating
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LACK/LOSS OF POWER - ACCELERATION/CRUISE
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• Engine mounts
• Check valve (two-way)
Inspect for cause.
[LF].)
[LF].)
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B3E010318881W14