• Confirm trouble symptom using the following diagnostic index, then go to the appropriate trouble shooting chart.
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No.
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TROUBLESHOOTING ITEM
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DESCRIPTION
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PAGE
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|
|---|---|---|---|---|
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1
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Melting of main or other fuses
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-
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2
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MIL comes on
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MIL is illuminated incorrectly.
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3
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Will not crank
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Starter does not work.
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4
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Hard start/long crank/erratic start/erratic crank
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Starter cranks engine at normal speed but engine requires excessive cranking time before starting.
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5
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Engine stalls
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After start/at idle
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Engine stops unexpectedly at idle and/or after start.
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6
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Cranks normally but will not start
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Starter cranks engine at normal speed but engine will not run.
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7
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Slow return to idle
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Engine takes more time than normal to return to idle speed.
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8
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Engine runs rough/rolling idle
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Engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively.
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9
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Fast idle/runs on
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Engine speed continues at fast idle after warm-up.
Engine runs after ignition switch is turned off.
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10
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Low idle/stalls during deceleration
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Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
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11
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Engine stalls/quits
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Acceleration/cruise
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Engine stops unexpectedly at beginning of acceleration or during acceleration.
Engine stops unexpectedly while cruising.
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|
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Engine runs rough
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Acceleration/cruise
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Engine speed fluctuates during acceleration or cruising.
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Misses
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Acceleration/cruise
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Engine misses during acceleration or cruising.
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Buck/jerk
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Acceleration/cruise/deceleration
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Vehicle bucks/jerks during acceleration, cruising, or deceleration.
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Hesitation/stumble
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Acceleration
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Momentary pause at beginning of acceleration, or during acceleration
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Surges
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Acceleration/cruise
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Momentary minor irregularity in engine output
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12
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Lack/loss of power
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Acceleration/cruise
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Performance poor under load (e.g. power down when climbing hills).
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13
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Knocking/pinging
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Acceleration/cruise
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Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g. hot spot in combustion chamber).
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14
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Poor fuel economy
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Fuel economy is unsatisfactory.
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15
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Emissions compliance
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Fails emissions test
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16
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High oil consumption/leakage
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Oil consumption is excessive.
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17
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Cooling system concerns
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Overheating
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Engine runs at higher than normal temperature/overheats.
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|
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18
|
Cooling system concerns
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Runs cold
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Engine does not reach normal operating temperature.
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19
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Exhaust smoke
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Blue, black, or white smoke from exhaust system
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20
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Fuel odor (in engine compartment)
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Gasoline fuel smell or visible leakage
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21
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Engine noise
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Engine noise from under hood
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22
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Vibration concerns (engine)
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Vibration from under hood or driveline
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23
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A/C does not work sufficiently
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A/C compressor magnetic clutch does not engage when A/C is turned on.
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24
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A/C always on or A/C compressor runs continuously.
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A/C compressor magnetic clutch does not disengage.
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25
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A/C does not cut off under wide open throttle conditions.
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A/C compressor magnetic clutch does not disengage under wide open throttle.
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26
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Exhaust sulphur smell
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Rotten egg smell (sulphur) from exhaust
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27
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Constant voltage
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Incorrect constant voltage
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28
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Spark plug condition
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Incorrect spark plug condition
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29
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ATX concerns
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Upshift/downshift/engagement
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ATX concerns not related to engine performance
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(See Diagnosis Index.)
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