Try unhooking your battery, take it Auto Zone for a full charge, then hook it back up in your vehicle, that should give the computer enough time to reset tiself to the full charged battery, They charge batteries for free by the way. 30 min's to an hr in most cases.
There was no problem with battery. If 5 volt ref in computer is boosted to 8 volts manually, van will run ok. Once you shut engine off and try to restart, see same trouble...won't start.
Have replaced orig computer, on which, boosting voltage to 8 volts, had no effect. Believe that 2nd computer is ok, somewhat. Why will van start ok if 5 volt ref in computer is boosted to 8 volts? And why will van not continue to read 8 volts needed?
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The exhaust gas recirculation (EGR) valve
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The fuel tank pressure (FTP) sensor
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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
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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.
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For an intermittent condition, refer to Intermittent Conditions .
Does the vehicle start an run ?
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reference is 5 volts not 8
There was no problem with battery. If 5 volt ref in computer is boosted to 8 volts manually, van will run ok. Once you shut engine off and try to restart, see same trouble...won't start. Have replaced orig computer, on which, boosting voltage to 8 volts, had no effect. Believe that 2nd computer is ok, somewhat. Why will van start ok if 5 volt ref in computer is boosted to 8 volts? And why will van not continue to read 8 volts needed?
giving the other expert the poor rating was unfair, and 5 volts is the reference voltage of ALL OBD2 electronic engine control systems, seek professional help u are over your head here.
The rating was not an insult by no means. I'm sorry that I offended you. I thought the rating was a standard to use IF answer was a help, not a judgement of your expertise or otherwise. Please accept my apology. Thank you.
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