SYMPTOM DIAGNOSTIC INDEX [L3 Turbo]SM2444499
SYMPTOM DIAGNOSTIC INDEX [L3 Turbo]

id0103b4800500

• Verify malfunction symptoms using the following diagnostic index, then go to the appropriate troubleshooting chart.

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 the engine at normal speed but the engine requires excessive cranking time before starting.
• Battery is operating normally.
5
Engine stalls
After start/at idle
• Engine stops unexpectedly at idle or after start or both.
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 the engine stalls.
• 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.
• Engine speed continues at fast idle after warm-up.
8
Engine runs rough/rolling idle
• Engine speed fluctuates between the specified idle speed and lower speed, and engine shakes excessively.
• Idle speed is too slow and the 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 (e.g., power down when climbing hills).
13
Knocking/pinging
• Sound is produced when air/fuel mixture is ignited by something other than a spark plug (e.g., hot spot in the 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 hood.
22
Vibration concerns (engine)
• Vibration from under the hood 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 WOT.
26
Exhaust sulphur smell
• Rotten egg smell (sulphur) from exhaust.
27
Fuel refill concerns
• Fuel tank does not fill smoothly.
28
Fuel filling shut off issues
• Fuel does not shut off properly.
29
Spark plug condition
• Incorrect spark plug condition.
30
ATX concerns
Upshift/downshift/engagement
• ATX concerns not related to engine performance.