?€¢ 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 ?
?€¢ The MIL turns OFF after the engine is started if a diagnostic fault is not present.
?€¢ The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
?€¢ The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
?€¢ When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
?€¢ When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
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