Closed Loop Emission System
- Description
- Operation
- Diagnosis & Testing
- Diagnostic Circuit Check
- System Performance Check
- Trouble Codes
- CODE 12 (No Reference Pulse to ECM)
- CODE 13 (Open O2 Sensor Circuit)
- CODE 14 (Shorted Coolant Sensor Circuit)
- CODE 15 (Open Coolant Sensor Circuit)
- CODE 21 (Idle Switch Circuit Open or WOT Switch Circuit Shorted)
- CODE 22 & 51 (Fuel-Cut Solenoid Circuit Failure)
- CODE 23 & 54 (Duty Solenoid Circuit Failure)
- CODE 25 & 53 (AIR Vacuum Switching Valve (VSV) Failure)
- CODE 26 & 27 (Vacuum Switching Valve (VSV) Canister Purge Failure)
- CODE 31 (No Reference Signal)
- CODE 32 (EGR System Failure & Sensor Circuit Failure)
- CODE 34 (EGR Temperature Sensor or Harness Failure)
- CODE 44 (O2 Sensor Lean Condition)
- CODE 45 (O2 Sensor Rich Condition)
- CODE 52 & 55 (Internal ECM Problem)
- Air, Temperature, And Idle Testing
- Wiring Diagrams