Test TC-119A - Fuel System Lean
NOTE:
For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS
article in this section.
NOTE:
Very low fuel level could cause FUEL SYSTEM LEAN DTC to set. Ensure fuel tank is at least 1/4 full.
- If vehicle ran out of fuel shortly before FUEL SYSTEM LEAN DTC set, ensure fuel tank is at least 1/4 full. Using scan tool, erase DTCs and perform TEST VER-5A . If vehicle did not run out of fuel shortly before DTC set, ensure fuel tank is at least 1/4 full and go to next step.
- FUEL SYSTEM LEAN DTC sets if Powertrain Control Module (PCM) senses fuel system is running to lean on 2 sequential trips. Possible causes are: defective ignition coil, defective PCM, engine wear, defective exhaust manifold, defective fuel pump, defective fuel filter, defective ignition secondary wires, defective injectors, defective MAP sensor, defective upstream Oxygen Sensor (O2S), defective fuel pressure regulator, defective fuel pump relay, defective spark plugs, or defective connector terminals or connector wires. Go to next step.
- Using scan tool, read DTCs. Repair any other DTCs before proceeding. See DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no other DTCs exist, go to next step.
- Start engine. Allow engine to reach normal operating temperature. Allow engine to idle for 20 seconds after warm-up. Inspect exhaust system between engine and upstream O2S for leaks. Repair exhaust system as necessary and perform TEST VER-5A . If exhaust system is okay, turn engine off and perform TEST TC-119B .