Component Tests and General Diagnostics
IDLE AND/OR 2,5000 RPM CO/HC CHECKNOTE: This check is used only to determine whether or not the idle and/or 2,500 rpm CO/HC complies with regulations.
1. INITIAL CONDITIONS:
- Engine coolant at normal operating temperature
- Air cleaner installed
- All pipes and hoses of air induction system connected
- All accessories switched OFF
- All vacuum lines properly connected
- All vacuum hoses for EGR systems, etc. should be properly connected.
- MFI system wiring connectors fully plugged
- Ignition timing set correctly
- Transmission in neutral position
- CO/HC meter calibrated by hand
2. START ENGINE.
3. RACE ENGINE AT 2,500 RPM FOR APPROXIMATELY 180 SECONDS.
4. INSERT CO/HC METER TESTING PROBE AT LEAST 40 cm (1.3 ft) INTO TAIL PIPE DURING IDLING.
6. IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM.
HINT: When doing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
^ If the CO/HC concentration does not comply with regulations, go to Diagnosis By Symptom and troubleshoot according to that table.