Intake Air Temperature/Fuel Temperature Correlation

Descripción

This code suggests a discrepancy between the temperature readings of the air entering the engine and the fuel. The engine's computer expects these temperatures to be related in a certain way, and they are not.

Pasos de reparación

1. 1 Check for any loose or corroded connectors at both the intake air temperature (IAT) sensor and the fuel temperature sensor, cleaning and reseating as needed.
2. 2 Inspect the air intake system for restrictions (clogged air filter) or leaks (cracked hoses, loose clamps) that could affect IAT readings.
3. 3 Check the wiring harness between the IAT sensor and the ECM for damaged, chafed, or shorted wires, and repair as needed.
4. 4 Check the wiring harness between the fuel temperature sensor and the ECM for damaged, chafed, or shorted wires, and repair as needed.
5. 5 Test the intake air temperature sensor with a multimeter to verify proper resistance values, and replace if out of specification.
6. 6 Test the fuel temperature sensor with a multimeter to verify proper resistance values, and replace if out of specification.
7. 7 Replace the intake air temperature sensor if readings are inconsistent or out of range.
8. 8 Replace the fuel temperature sensor if readings are inconsistent or out of range.
9. 9 If all sensors and wiring test normal, have the engine control module (ECM) inspected and reprogrammed or replaced by a qualified technician.

Diagnóstico y costo