Question about 2000 Hyundai Elantra
Scan tool diagnoise indicate P1128 Fuel System Lean Part Load. What is the cause for this?
Intake manifold gasket leak vacuum leaks, a defective MAF sensor, low fuel pressure under a load or a defective O2 sensor.
Posted on Feb 10, 2009
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Posted on Jan 02, 2017
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Fuel Trim System Lean
Test for fuel contamination. Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .The system will go lean if an injector is not supplying enough fuel.A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions .
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WITH MANUAL TRANSMISSION
Table 3: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
MAF (kg/h) 9.5
Table 4: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
MAF (g/h) 2.5
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