Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
 
Vehicle » Powertrain Management » Computers and Control Systems » Testing and Inspection » Reading and Clearing Diagnostic Trouble Codes » Reading Diagnostic Trouble Codes » Step 3: No DTC(s) Present Symptom Charts  
 
 
  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 customer to turn engine off while refueling to avoid contamination or damage to the EVAP system.

  

  

Chart 2

  • Starting Concerns:
  • Hard 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 diagnostic/repair information.

  

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 be 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

  • Emissions Compliance

  

Chart 12

  • Warning Indicators:
  • MIL
  • 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 a 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 diagnose 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 See: Symptom Related Diagnostic Procedures (for noise such as spark knock) or applicable diagnostic/repair information.

  

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 Concerns
  • 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.