ENGINE SYMPTOM TROUBLESHOOTING [L8, LF]
id0103a0800300
Diagnostic Index
|
No. |
TROUBLESHOOTING ITEM |
DESCRIPTION |
|
|---|---|---|---|
|
1
|
Melting of main or other fuses
|
—
|
|
|
2
|
MIL illuminates
|
• MIL is illuminated incorrectly.
|
|
|
3
|
Will not crank
|
• Starter does not work.
|
|
|
4
|
Hard to start/long crank/erratic start/erratic crank
|
• Starter cranks engine at normal speed but engine requires excessive cranking time before starting. (The battery is in normal condition.)
|
|
|
5
|
Engine stalls
|
After start/at idle
|
• Engine stops unexpectedly at idle and/or after start.
|
|
6
|
Cranks normally but will not start
|
• Starter cranks engine at normal speed but engine will not run.
• Refer to symptom troubleshooting “NO.5 ENGINE STALLS” if this symptom appears after engine stall.
• Fuel is in tank.
• Battery is in normal condition.
|
|
|
7
|
Slow return to idle
|
• Engine takes more time than normal to return to idle speed.
|
|
|
8
|
Engine runs rough/rolling idle
|
• Engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively.
• Idle speed is too slow and engine shakes excessively.
|
|
|
9
|
Fast idle/runs on
|
• Engine speed continues at fast idle after warm-up.
• Engine runs after the ignition switch is turned off.
|
|
|
10
|
Low idle/stalls during deceleration
|
• Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
|
|
|
11
|
Engine stalls/quits
|
Acceleration/cruise
|
• Engine stops unexpectedly at beginning of acceleration or during acceleration.
• Engine stops unexpectedly while cruising.
|
|
Engine runs rough
|
Acceleration/cruise
|
• Engine speed fluctuates during acceleration or cruising.
|
|
|
Misses
|
Acceleration/cruise
|
• Engine misses during acceleration or cruising.
|
|
|
Buck/jerk
|
Acceleration/cruise/deceleration
|
• Vehicle bucks/jerks during acceleration, cruising, or deceleration.
|
|
|
Hesitation/stumble
|
Acceleration
|
• Momentary pause at beginning of acceleration or during acceleration.
|
|
|
Surges
|
Acceleration/cruise
|
• Momentary minor irregularity in engine output.
|
|
|
12
|
Lack/loss of power
|
Acceleration/cruise
|
• Performance is poor under load (such as power down when climbing hills).
|
|
13
|
Knocking/pinging
|
Acceleration/cruise
|
• Sound is produced when air/fuel mixture is ignited by something other than spark plug (such as hot spot in combustion chamber).
|
|
14
|
Poor fuel economy
|
• Fuel economy is unsatisfactory.
|
|
|
15
|
Emission compliance
|
• Fails emissions test.
|
|
|
16
|
High oil consumption/leakage
|
• Oil consumption is excessive.
|
|
|
17
|
Cooling system concerns
|
Overheating
|
• Engine runs at higher than normal temperature/overheats.
|
|
18
|
Cooling system concerns
|
Runs cold
|
• Engine does not reach normal operating temperature.
|
|
19
|
Exhaust smoke
|
• Blue, black, or white smoke from exhaust system.
|
|
|
20
|
Fuel odor (in engine compartment)
|
• Gasoline fuel smell or visible leakage.
|
|
|
21
|
Engine noise
|
• Engine noise from under bonnet.
|
|
|
22
|
Vibration concerns (engine)
|
• Vibration from under bonnet or driveline.
|
|
|
23
|
A/C does not work sufficiently
|
• A/C compressor magnetic clutch does not engage when A/C is turned on.
|
|
|
24
|
A/C is always on or A/C compressor runs continuously
|
• A/C compressor magnetic clutch does not disengage.
|
|
|
25
|
A/C is not cut off under wide open throttle conditions
|
• A/C compressor magnetic clutch does not disengage under wide open throttle.
|
|
|
26
|
Exhaust sulphur smell
|
• Rotten egg smell (sulphur) from exhaust.
|
|
|
27
|
Spark plug condition
|
• Incorrect spark plug condition.
|
|
|
28
|
AT concerns
|
Upshift/downshift/ engagement
|
• AT concerns not related to engine performance.
|