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ENGINE SYMPTOM TROUBLESHOOTING

BHE010300103W01

• Confirm trouble symptom using the following diagnostic index, then go to the applicable troubleshooting chart.

Diagnostic Index

No. | TROUBLESHOOTING ITEM | DESCRIPTION
--- | --- | ---
1 | Melting of main or other fuses | -
2 | MIL comes on | The MIL is illuminated incorrectly. (No DTC's)
3 | Will not crank | The starter does not work.
4 | Hard to start/long crank/erratic start/erratic crank | The starter cranks engine at normal speed but engine requires excessive cranking time before starting.
5 | Engine stalls. | After start/at idle | The engine stops unexpectedly at idle and/or after start.
6 | Cranks normally but will not start | The starter cranks engine at normal speed but engine will not run.
7 | Slow return to idle | The engine takes more time than normal to return to idle speed.
8 | Engine runs rough/rolling idle | The engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively.
9 | Fast idle/runs on | The engine speed continues at fast idle after warm-up. The engine runs after ignition switch is turned off. ]Exhaust afterburn
10 | Low idle/stalls during deceleration | The engine stops unexpectedly at beginning of deceleration or recovery from deceleration. Exhaust afterburn
11 | Engine stalls/quits. | Acceleration/cruise | The engine stops unexpectedly at beginning of acceleration or during acceleration. The engine stops unexpectedly while cruising.
Engine runs rough. | Acceleration/cruise | The engine speed fluctuates during acceleration or cruising.
Misses | Acceleration/cruise | The engine misses during acceleration or cruising.
Buck/jerk | Acceleration/cruise/ deceleration | The vehicle bucks/jerks during acceleration, cruising, or deceleration.
Hesitation/stumble | Acceleration | A momentary pause at beginning of acceleration or during acceleration.
Surges | Acceleration/cruise | A momentary minor irregularity in engine output.
12 | Lack/loss of power | Acceleration/cruise | The performance is poor under load (e.g. power down when climbing hills).
13 | Knocking/pinging/detonation | Acceleration/cruise | Sound is produced when the air/fuel mixture is ignited by something other than the spark plug (e.g. hot spot in combustion chamber).
14 | Poor fuel economy | The fuel economy is unsatisfactory.
15 | Emission compliance | Fails emissions test.
16 | High oil consumption/leakage | The oil consumption is excessive.
17 | Cooling system concerns | Overheating | The engine runs at higher than normal temperature/overheats.
18 | Cooling system concerns | Runs cold | The 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 hood or driveline
23 | A/C does not work sufficiently. | The 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. | The A/C compressor magnetic clutch does not disengage.
25 | A/C does not cut off under wide open throttle conditions. | The 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 | An incorrect spark plug condition.
28 | AT concerns | Upshift/downshift engagement | AT concerns not related to engine performance.