Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
 
Vehicle » Powertrain Management » Computers and Control Systems » Testing and Inspection » Pinpoint Tests » QT: Step 1: PCM Quick Test  
 
 
  QT: Step 1: PCM Quick Test  
 

QT: Step 1: PCM Quick Test

QT1 PERFORM PCM QUICK TEST

Note: If the vehicle was brought in with an emission compliance failure symptom, GO directly to Section 5; GO to EM1 See: EM: Emissions Compliance - Pinpoint Test.

  • Complete preliminary checks looking for obvious concerns that may relate to the symptom. Check items such as those listed:
  • Related electrical connectors or fuses
  • Vacuum lines (leaks, routing)
  • Air intake system (leaks, restrictions)
  • Fuel quality (octane, contamination, winter/summer blend)
  • Cooling system (engine operating at proper temperature)
  • Access any related OASIS or TSB information (if available).
  • Complete PCM Quick Test to access any DTCs. Note any Key On Engine Off, Key On Engine Running (if engine runs) and Continuous Memory (MIL and non-MIL) DTCs.

Note: If unable to access DTCs, or any scan tool communication concern exists, GO to QA1 See: QA: Unable To Activate Self-Test/SCP Communication Error/DTC Not Listed - Pinpoint Test in Section 5. For additional information on retrieving MIL and non-MIL DTCs, refer to Section 2, Diagnostic Methods See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 2: Diagnostic Methods\Diagnostic Methods (Continuous Memory Self-Test).
Were any DTCs present?
Yes

  • If engine runs rough at idle and Key On Engine Running or Continuous Memory DTC(s) are present:
  • GO to Quick Test QT2

to check injector fault PIDS.

  1. Any KOEO DTC(s)
  2. Any KOER DTC(s)
  3. Any Continuous

Memory DTC(s) (retrieve any available Freeze Frame Data)(disregard any
identical/related Continuous DTC(s) of DTC(s) already serviced).

No

Note: If symptom is not listed, REFER to applicable diagnostic/repair information or GO to Z1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\Z: Intermittent - Pinpoint Test in Section 5 (for intermittent PCM system diagnostics).

QT2 ENGINE RUNS ROUGH AT IDLE WITH KEY ON ENGINE RUNNING OR CONTINUOUS MEMORY DTC(s): CHECK INJECTOR FAULT (INJxF) PID(s)

Note: An injector circuit fault could result in unrelated DTC(s) being received from the PCM.

  • Key on, engine off.
  • Access the INJxF PIDs (the "x" indicates the injector number). There will be one INJxF PID for each engine cylinder.

Do any of the INJxF PIDs indicate "Yes"?
Yes

.

.

No

  • No fault detected by injector fault PIDs. KEY OFF. GO to Quick Test QT1

and follow the YES Action To Take for all others.