Symptom Troubleshooting [Engine Control System (Lf)]; Engine Symptom Troubleshooting [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
SYMPTOM TROUBLESHOOTING
[ENGINE CONTROL SYSTEM (LF)]

ENGINE SYMPTOM TROUBLESHOOTING [LF]

• Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting
chart.
Diagnostic Index
No. TROUBLESHOOTING ITEM
1 Melting of main or other fuses
2 MIL illuminates.
3 Will not crank
Hard to start/long crank/erratic start/erratic
4
crank
5 Engine stalls.
6 Cranks normally but will not start
7 Slow return to idle
8 Engine runs rough/rolling idle
9 Fast idle/runs on
10 Low idle/stalls during deceleration
Engine stalls/quits.
11
Engine runs rough.
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MIL is illuminated incorrectly.
Starter does not work.
Starter cranks engine at normal speed but engine
requires excessive cranking time before starting.
After start/at idle Engine stops unexpectedly at idle and/or after start.
Starter cranks engine at normal speed but engine will
not run.
Engine takes more time than normal to return to idle
speed.
Engine speed fluctuates between specified idle
speed and lower speed and engine shakes
excessively.
Engine speed continues at fast idle after warm-up.
Engine runs after ignition switch is turned off.
Engine stops unexpectedly at beginning of
deceleration or recovery from deceleration.
Engine stops unexpectedly at beginning of
acceleration or during acceleration.
Acceleration/cruise
Engine stops unexpectedly while cruising.
Engine speed fluctuates during acceleration or
Acceleration/cruise
cruising.
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B3E010318881W01