Skyhawk L4-112 1.8L VIN 0 TBI (1982)
example reading is still in control of fuel delivery and unless the high or low limits are displayed the system is making necessary adjustments. The rich or
lean readings displayed will indicate what fuel delivery is required for that particular engine to operate at design intent of 14.7 to 1 fuel air ratios.
BLOCK LEARN SCAN TOOL READINGS
ONLY ONE BLOCK (Set of Numbers) WILL BE SEEN AT A TIME
NORMAL/SCAN READING
These readings show that all cells are running at design air fuel ratios of 14.7 to 1 in all RPM and engine load conditions.
SLIGHTLY LEAN EXHAUST READING
These readings are examples of what may actually be seen when the ECM is compensating for a slightly lean exhaust.
SLIGHTLY RICH EXHAUST READING
These readings are examples of what may actually be seen when the ECM is compensating for a slightly rich exhaust.
150 LEAN EXHAUST READING
As explained in this bulletin all fuel injected engines have limits programed into the PROM. These limits will not allow fuel delivery to go beyond the
program limits, in this case 150 is the designed limit. Lean Exhaust (low oxygen sensor voltage is indicated).
