Test TC-119B - Fuel System Lean
NOTE:
Perform TEST TC-119A before proceeding.
- Check for defective wiring or connections at upstream oxygen sensor, downstream oxygen sensor and Powertrain Control Module (PCM).
- Upstream oxygen sensor is mounted on exhaust manifold. Downstream oxygen sensor is mounted on exhaust pipe, behind catalytic converter. The PCM is located between driver's side front fender and power distribution center, near battery.
- Perform following tests in the order listed. See TESTING SEQUENCE table. If a test passes, proceed to the next test until the problem is found.
TESTING SEQUENCE
| Test Name | Test To Be Performed |
|---|---|
| Checking Fuel Pressure (Gasoline Models) | TEST NTC-3A |
| Checking Secondary Ignition & Timing | TEST NTC-2A |
| Checking Coolant Sensor Calibration & Radiator Fan Operation | TEST NTC-4A |
| Checking MAP Sensor | TEST NTC-6A |
| Checking Oxygen Sensor Switching | TEST NTC-7A |
| Checking Engine Mechanical Systems | TEST NTC-17A |