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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1635: 5-Volt Reference Circuit >> Circuit Description

Circuit Description

The 5-volt reference circuit provides a signal voltage to the EGR valve position sensor, fuel tank pressure sensor, MAP sensor and TP sensor. The current for each 5-volt reference circuit flows through the sensor ground in the PCM. The PCM regulates the 5-volt reference voltage under all normal operating conditions.

DTC will set if the 5-volt reference signal is less than 4.75 volts. This diagnostic runs continuously with ignition on.

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