Engine Controls - Tests W/Codes - V6

• Introduction
• Ecu Location
• Hard Failures
• "Intermittent Failures"
• Check Engine Light
• Retrieving Trouble Codes
• Notes On Trouble Codes
• Clearing Trouble Codes
• Repair Procedure
• Summary
  • No Codes Present, DRIVEABILITY Complaint Still Present
• Trouble Code Charts - EFI Models
• Diagnostic Hints - EFI Models
• Diagnostic Circuit Check
• Ecu Terminal Identification
• Test 1 Or Code 11 - Ecu (B+) Circuit
• Test 2 Or Code 12, 13, 14 - Ignition & Rpm Signal
• Test 3 Or Code 21 - Oxygen Sensor Signal
• Test 4 Or Code 22 - Coolant Temperature Sensor Signal
• Test 5 Or Code 24, 31, 32 - Air Temp Sensor/Airflow Meter
  • Intake Air Temperature Sensor & Airflow Meter Signal
• Code 25 - Lean Air/Fuel Mixture
  • Probable Causes
• Code 26 - Rich Air/Fuel Mixture
  • Probable Causes
• Code 35 - HAC Sensor Signal
  • Notes
  • Probable Causes
• Test 6 Or Code 41 - Throttle Position Sensor Signal
• Code 42 - Vehicle Speed Sensor Signal
  • Probable Causes
• Test 7 Or Code 43 - Starter Signal
• Code 51 - Switch Signal
  • Probable Causes
• Code 52 - Knock Sensor Signal
  • Probable Causes
• Code 53 - Knock Sensor Control (Ecu)
  • Probable Causes
• Test 8 Or Code 71 - EGR System Malfunction
• Test 9 - Injector Circuit
• Test 10 - Cold Start Injector Circuit
• Test 11 - Check Engine Light Circuit
• Test 12 - Stoplight Switch Circuit