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Engine Controls - System & Component Tests - Eec-V - Gasoline: Diagnosis Mercury Sable IV

Testing & Diagnostics ~2114 words

Diagnostic Routines

  1. 1) Analyze Vehicle Inspection/Maintenance (I/M) Test Report Ensure vehicle Inspection/Maintenance (I/M) test report has been analyzed. Check for data entry errors, correct model, year, vehicle test weight and correct calibration (California or Federal). Identify which gas readings are HIGH and which were LOW. If report includes a drive trace, identify during which mode the gas(es) failed. When report has been analyzed completely, go to next step.
  2. 2) Vehicle Failed EVAP Compliance If vehicle failed an EVAP Emissions System Leak Test or a Purge Flow Test only, go to step 35) . If vehicle failed EVAP, Purge Flow and gas tests, go to next step.
  3. 3) Baseline Vehicle Using an exhaust gas analyzer, baseline vehicle. If vehicle must be driven to achieve baseline, ensure baseline drive cycle is able to be repeated to verify the repairs. During baseline, check for any related symptoms that may be present (driveability, A/T shifting or exhaust smoke). When vehicle has been baselined, go to next step.
  4. 4) Check For Other Symptoms Check for driveability concerns (including idle and A/T shifting concerns, exhaust smoke and for cooling system concerns (engine unable to reach normal operating temperature). If other symptoms are present, perform «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repair as necessary, then go to step 40) to verify repairs. If no other symptoms are present, go to next step.
  5. 5) Preliminary Checks Check for vacuum leaks or blockage. Check wiring harness connectors. Ensure proper scheduled maintenance has been performed. Check intake air tube and air cleaner for obstructions, leaks or dirty element. Ensure proper emission controls and components are installed on vehicle. Repair as necessary, then go to step 40) to verify repairs. If no repairs are necessary and all checks are okay, go to next step.
  6. 6) Perform PCM Quick Test Perform «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to retrieve Diagnostic Trouble Codes (DTCs). If no DTCs are present, go to next step. If DTCs are present, service DTC. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE article to service appropriate DTC, then go to step 40) to verify repairs.
  7. 7) Check Carbon Monoxide (CO) Levels Check vehicle CO levels. If vehicle did not have excessive CO levels, go to next step. If vehicle had excessive CO levels, this indicates that engine is running rich. Go to step 15) .
  8. 8) Check Hydrocarbon (HC) Levels Check vehicle HC levels. If vehicle did not have excessive HC levels, go to next step. If vehicle had excessive HC levels with low to normal CO levels, this indicates that engine is running lean. Go to step 25) .
  9. 9) Check Oxides Of Nitrogen (NOx) Levels Check vehicle NOx levels. If vehicle did not have excessive NOx levels, verify all previous testing. If vehicle had excessive NOx levels, go to step 30) .
  10. 15) High CO Levels: Check HC Levels Check vehicle HC levels. If vehicle had excessive HC levels, check for incomplete combustion/running rich. Go to next step. If vehicle did not have excessive HC levels, go to step 17) to check for running rich concern.
  11. 16) Check Secondary Ignition System Go to «TEST JB: SECONDARY IGNITION»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to check secondary ignition system. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If secondary ignition system is okay, go to next step.
  12. 17) Check Fuel Delivery System For High Fuel Pressure Or Leak-Down Check fuel delivery system. On Natural Gas models, go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. On all other models, go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If fuel delivery system is okay, go to next step.
  13. 18) Check PCV System Check PCV system. Go to «TEST HG: PCV SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If PCV system is okay, go to next step.
  14. 19) Check Exhaust System Check exhaust system. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If exhaust system is okay, go to next step.
  15. 20) Check Engine Mechanical Condition See appropriate article in ENGINES. Check compression, camshaft, valve train components, etc. Repair as necessary, then go to step 40) to verify repairs. If no engine mechanical problems are indicated and all checks are okay, go to next step.
  16. 21) Additional Checks Ensure correct PCV valve is installed for application. Service as necessary, then go to step 40) to verify repairs. If PCV valve is correct, go to step 45) .
  17. 25) High HC With Normal To Low CO Level, Check Fuel Delivery System For Leak-Down Or Low Fuel Pressure Check fuel delivery system for leak-down or low pressure. On Natural Gas models, go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. On all other models, go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If fuel delivery system is okay, go to next step.
  18. 26) Check Secondary Ignition System Go to «TEST JB: SECONDARY IGNITION»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to check secondary ignition system. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If secondary ignition system is okay, go to next step.
  19. 27) Check PCV System Go to «TEST HG: PCV SYSTEM»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to check PCV system. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs. If PCV system is okay, go to next step.
  20. 28) Check Engine Mechanical Condition See appropriate article in ENGINES. Check compression, camshaft, valve train components, etc. Repair as necessary, then go to step 40) to verify repairs. If no engine mechanical problems are indicated and all checks are okay, go to next step
  21. 29) Additional Checks Ensure correct PCV valve is installed for application. Service as necessary, then go to step 40) to verify repairs. If PCV valve is correct, go to step 45) .
  22. 30) High NOx With Normal To Low HC & CO Levels Check engine for concerns such as excessive carbon build-up in combustion chamber. See appropriate article in ENGINES. Repair as necessary, then go to step 40) to verify repairs. If no engine mechanical problems are indicated, go to next step.
  23. 31) Additional Checks Check Torque Converter Clutch (TCC) operation. See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. Check intake air system for add-on aftermarket parts or modifications which may restrict airflow into intake air system. Check for running lean concerns (vacuum leaks or low fuel pressure), refer to procedures starting at step 25) . Repair as necessary, then go to step 40) to verify repairs. If all checks are okay, go to step 45) .
  24. 35) EVAP System Concern: Preliminary Checks Analyze I/M test report to determine when concern is present. Verify concern and inspect and repair the following as necessary: Check fuel filler cap for proper installation, physical damage or contamination. Check EVAP system hoses and lines for proper connection, damage or blockage. Check fuel vapor storage canister for damage. If all checks are okay, go to next step. If repairs have been performed, go to step 38) to verify repairs.
  25. 36) Perform PCM Quick Test Perform «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to retrieve Diagnostic Trouble Codes (DTCs). If no DTCs are present, go to next step. If DTCs are present, service DTC. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article to service appropriate DTC, then go to step 38) to verify repairs.
  26. 37) Check EVAP Emissions System For Leaks See appropriate symptom under «EVAPORATIVE EMISSION SYSTEM TESTS»(ref-138346-S25626694672002040800000). Follow diagnostic procedures and repair as necessary, then go to step 38). If EVAP emission system is okay, verify test results. If results are okay, go to «TEST Z: INTERMITTENT»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv), step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article, or return to «SYMPTOM DIAGNOSIS»(ref-138152-S41530141532002032500000) under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE & NGV article to repair any additional symptoms. Follow diagnostic procedures and repair as necessary, then go to step 38).
  27. 38) EVAP Emissions System Repair Verification After making repairs to EVAP emissions system, reset KAM and relearn basic adaptive strategy. See «KEEP ALIVE RANDOM ACCESS MEMORY RESET PROCEDURE»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repeat «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repair any DTCs that may be retrieved and perform «EVAPORATIVE EMISSIONS SYSTEM LEAK TEST»(ref-138346-S37496564392002040800000) under EVAPORATIVE EMISSION SYSTEM TESTS. If original concern has not been corrected or if another concern exists, repeat step 1).
  28. 40) Repair Verification After making repairs to appropriate system, reset KAM and relearn basic adaptive strategy. See «KEEP ALIVE RANDOM ACCESS MEMORY RESET PROCEDURE»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repeat «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repair any DTCs that may be retrieved. Repeat baseline test using gas analyzer. If vehicle requires driving for the baseline test, drive at least 5 miles to relearn some additional Adaptive Learning Strategy (trim values). Ensure same drive mode is used as original baseline test performed in step 3) . If all gas levels are within acceptable range, save all repair documentation that may be required by local or federal law and return vehicle to customer. If any gas level is not within acceptable range, go to step 1) .
  29. 45) Catalyst Delta Temperature Test Disable secondary AIR system, if equipped. Start and run engine for 2 minutes at 2500 RPM to heat exhaust system. Turn ignition switch to OFF position. Disconnect and ground one spark plug wire from each cylinder bank (for Coil On Plug applications, disconnect one coil connector from each cylinder bank). Start and run engine at 1000 RPM. Disconnect Idle Air Control (IAC) valve while maintaining 1000 RPM. Using an infrared temperature probe, measure temperature at both the inlet and outlet of each catalytic converter. If the temperature difference between inlet and outlet of each catalytic converter is 50°F (28°C) or less, testing indicates catalytic converter is not operating correctly. Repeat test step to verify readings. If temperature differences are still 50°F (28°C) or less, replace affected catalytic converter. Reconnect all connectors, IAC valve and AIR system. Go to step 40) to verify repairs. If the temperature difference between inlet and outlet of each catalytic converter is more than 50°F (28°C), the catalytic converters are operating correctly. Reconnect all connectors, IAC valve and AIR system. Perform «PCM RESET PROCEDURE»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Repeat QUICK TEST to clear any DTCs set during testing. See «QUICK TEST»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Verify previous test results. If results are okay, go to «TEST Z: INTERMITTENT»(/mercury/sable/iv-1999-2005/remont/testing-diagnostics/#engine-controls-self-diagnostics-eec-v-gasoline-ngv) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Follow diagnostic procedures and repair as necessary, then go to step 40) to verify repairs.

EVAPORATIVE EMISSIONS SYSTEM LEAK TEST

Connect Evaporative Emissions System Leak Tester (134-00056) to EVAP test port. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE. Pressurize EVAP system to 14 in. H 2 O (3.48 kPa). Monitor system pressure for 2 minutes. EVAP system pressure should not fall below 8 in. H 2 O (2 kPa). Repair leaks as necessary. Repeat EVAP system leak test until system pressure remains greater than 8 in. H 2 O (2 kPa) after 2 minutes.

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