Detecting Condition

DETECTING CONDITION

HINT:
- If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC PO170 is recorded. The MIL then comes on.
- Fuel trim applies separately to bank 1 and bank 2, 50 the ECM lights up the MIL if a problem occurs with either bank.
- You can tell which bank is malfunctioning by looking at the short-term fuel trim and long-term fuel trim, thus allowing you to focus your inspection.
- If the total of the short-term fuel trim value and long-term fuel trim value for each bank is within ± 25%, the system is functioning normally.