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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System - 4.8L, 5.3L & 6.0L (DTC P0140 Or P0160 To DTC P0449)) >> Diagnostic Information and Procedures >> DTC P0169 >> Circuit Description

Circuit Description

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The powertrain control module (PCM) uses information from the intake air temperature (IAT) and the engine coolant temperature (ECT) sensors to determine ambient temperature at cold startup. Alcohol content (percentage) information is supplied to the PCM from the fuel composition sensor. This information is used by the technician in diagnosing symptom related complaints such as hard starting in cold ambient temperatures. The PCM monitors the fuel frequency during the first 30 seconds of run time. When the PCM detects alcohol content that is too high for a given ambient temperature, this DTC sets.

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