Step 3: No DTC(S) Present Symptom Charts
Step 3: No DTC(s) Present Symptom Charts
Chart 1
- Starting Concerns: Stalls After Start
- Stalls/Quits: Idle, Acceleration, Cruise
- Runs Rough
- Misses
- Buck/Jerk
- Hesitation/Stumble
- Surge
- Unique Idle concerns: Rolling Idle
Note: For stalls on passenger car applications, engine may stall if left running while refueling. Advise customers to turn engine off while refueling to avoid contamination or damage to the EVAP system.
Chart 2
Starting Concerns
- Hart Start/Long Crank
- Erratic Start/Erratic Crank
Chart 3
Starting Concerns:
- No Start, Normal Crank
Note: Extended cranking because of a no start can load the exhaust system with raw fuel, damaging the catalytic converter after the engine starts. For applications with Secondary Air Injection (AIR) Systems, perform the following after the no start has been repaired. Disconnect the electric secondary air injection (AIR) solid state relay, run the engine until the surplus fuel is used up, and reconnect the relay (disconnecting the relay may set a Continuous Memory PCM DTC that will need to be cleared).
Chart 4
Unique Idle Concerns:
- Slow Return To Idle
Chart 5
Unique Idle Concerns:
- Fast Idle
Additional Driveability Concerns:
- Diesels/Runs On
Note: If vehicle runs normally after the ignition key is turned OFF, check for damaged ignition switch, IGN RUN circuit short to power, VPWR circuit short to power, etc. Refer to applicable wiring diagram and/or service procedure.
Chart 6
Unique Idle Concerns:
- Low/Slow Idle
Stalls/Quits
- Deceleration
Chart 7
Backfires
Chart 8
Lack/Loss of Power
Note: Verify symptom is reported under normal driving conditions without excessive engine/vehicle load. Also, be aware of the engine rpm/speed limiting functions of the PCM.
Note: For applications with knock sensor, a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing will retarded and a lack of power may result.
Chart 9
Spark Knock
Chart 10
Poor Fuel Economy
Note: Since driving styles can have a significant influence on fuel economy, verify the concern before starting an in-depth diagnosis. Also, the following external factors could contribute to "poor fuel economy" conditions:
- Stop/go driving
- Improper tire pressure/size
- Vehicle loads (such as trailer towing)
- Extended winter warm-up conditions
- High speed driving
- Improper axle ratio
- Road/weather conditions
- Aftermarket add-ons
- Short run operations
- Customer expectations
Chart 11
Emission Compliance
Chart 12
Warning Indicators:
- NIL
- TCIL
- SIL
- Temperature Warning Indicator Lamp or Gauge (applications with CHT sensor)
- Check Fuel Cap Indicator Lamp
Note:
- If the symptom is both "MIL on" AND "exhaust emission test failure", GO directly to Chart 11.
- If engine is no start, GO directly to Chart 3.
- If engine runs rough at idle, Go directly to Chart 1.
Chart 13
Automatic Transmission Concerns:
- Upshift
- Downshift
- Engagement
Chart 14
Instrumentation
- Tachometer Inoperative
- Speedometer Inoperative
Chart 15
Oil System Concerns:
- High Oil Consumption
- Leaks
Chart 16
Cooling System Concerns
- Electric Cooling Fan (s) Does Not Operate (Low, Medium and/or High Speed)
- Hydraulic Cooling Fan Does Not Operate (LS6/8)
Chart 17
Cooling System Concerns:
- Electric or Hydraulic Cooling Fan(s) Always Runs
Note: This chart is intended to only diagnosis an electric or hydraulic cooling fan that always runs with a "cool" engine and the A/C and defroster off.
Chart 18
Exhaust System Concerns:
- Smoke
Note: Black smoke indicates a rich fuel mixture, blue smoke indicates burning oil, and white smoke indicates water in the combustion chamber.
Chart 19
Fuel System Concerns:
- Odor, Engine Compartment
Chart 20
Engine Noise (under hood)
Note: Attempt to identify source of noise. If noise is from source other than those listed below, refer to Symptom Index (for noise such as spark knock) or applicable Workshop Manual section.
Chart 21
Climate Control:
- Lack of Cooling (A/C)/ A/C Not Functioning
- A/C Always On
- A/C Compressor Runs Continuously
- A/C Does not CUT-OFF Under WOT Conditions (Mustang only)
Chart 22
Exhaust System Concern:
- Odor (Sulfur, Rotten Egg Smell)
Note: A slight sulfur smell may be normal. Catalysts with less than 8,000-16,000 kilometers (5,000 - 10,000 miles)(new vehicle or replaced catalyst) are likely to have a sulfur smell due to the highly active state of new catalysts. Replacing the catalyst can actually make the symptom worse.
