?€¢ The exhaust gas recirculation (EGR) valve
?€¢ The fuel tank pressure (FTP) sensor
?€¢ The throttle position (TP) sensor
These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside the PCM. Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P1635 sets. Diagnostic Aids ?€¢ If any sensor using a 5-volt bias voltage, such as the intake air temperature (IAT) sensor or fuel sensor, is shorted to voltage, DTC P1639 may set in addition to DTC P1635.
?€¢ For an intermittent condition, refer to Intermittent Conditions .
Does the vehicle start an run ?
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