Question about Chevrolet Impala
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Posted on Jan 02, 2017
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Dec 12, 2016 | 2003 Chevrolet Impala
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.
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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