DTC 23: Fuel Control, Running Rich
- If EVAP canister purge control valve has an electrical signal, go to DTC 89. If no electrical signal is present, check fuel pressure at idle. Fuel pressure should be 36.3 psi (2.5 kg/cm2 ) with vacuum hose connected to fuel pressure regulator, or 43.5 (3.0 kg/cm2 ) with vacuum hose disconnected.
- If fuel pressure is incorrect, check fuel pressure return line for blockage. Check vacuum signal if fuel pressure is high with vacuum hose connected. If necessary, replace fuel pressure regulator.
- If fuel pressure is okay, check for leaking fuel injector and DTC 34. Check mass airflow sensor. Repair or replace as necessary.