Engine Controls - Tests W/Codes

• 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
• 4A-FE & 4A-GE Diagnostic Circuit Check
• 4A-FE & 4A-GE Ecu Terminal Identification
• Test 1 Or Code 11 - Ecu (+B) Circuit (4A-FE & 4A-GE)
• Test 2 - Ecu Power Source (4A-FE & 4A-GE)
• Test 3 Or Code 12, 13, 14 - Ignition & Rpm Signal
• Test 4 Or Code 21, 25, 26- Oxygen Sensor Signal (4A-FE & GE)
• Test 5 Or Code 22 - Coolant Temp Sensor Signal (4A-FE & GE)
• Test 6 Or Code 24 - Intake Air Temp Sensor (4A-FE & 4A-GE)
• Test 7 Or Code 31 - Airflow Meter/Vacuum Sensor
  • Airflow Meter Signal (4A-GE); Vacuum Sensor Signal (4A-FE)
• Test 8 Or Code 41 - TPS Signal (4A-FE & 4A-GE)
  • Throttle Position Sensor (TPS) Signal (4A-FE & 4A-GE)
• Code 42 - Vehicle Speed Sensor (VSS) Signal
  • Probable Cause
• Test 9 Or Code 43 - Starter Signal (4A-FE & 4A-GE)
• Test 10 Or Code 51 - A/C Switch Signal (4A-FE & 4A-GE)
• Test 11 Or Code 71 - EGR System Malfunction (4A-FE & 4A-GE)
• Test 12 - Injector Circuit (4A-FE & 4A-GE)
• Test 13 - "Check Engine" Circuit (4A-FE & 4A-GE)