Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
please explain....what do you mean by"shuts down"
tell me all you can
will it start right back up?
does it do this hot and cold?
any work been done on the van lately?
this sounds as if you may have a bad crank sensor..these will do this with heat sometimes and not give a code for it,,when they are doing this,testing the sensor may not help replace it.
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The Crankshaft Position System Variation compensating values are stored in the powertrain control module (PCM) non-volatile memory after a learn procedure has been performed. If the actual Crankshaft Position System Variation is not within the Crankshaft Position System Variation compensating values stored in the PCM, DTC P0300 may set.
The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:
IMPORTANT: The scan tool Crankshaft Position System Variation Learn function will be inhibited if the engine coolant temperature is less than 70°C (158°F) . Allow the engine to warm to at least 70°C (158°F) before attempting the Crankshaft Position System Variation Learn Procedure.The scan tool Crankshaft Position System Variation Learn function will be inhibited if any powertrain diagnostic trouble codes (DTCs) other than DTC P1336 are set before or during the Crankshaft Position System Variation Learn Procedure. Diagnose and repair any DTCs set. Refer to the applicable DTCs.The Crankshaft Position System Variation Learn function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 24X reference circuit. If a malfunction has been indicated, refer to the following list to diagnose the system or the sensor.
The scan tool Crankshaft Position System Variation Learn function will not be enabled until the engine coolant temperature reaches 70°C (158°F) Selecting the Crankshaft Position System Variation Learn Procedure on the scan tool will command the PCM to enable CKP system variation learn fuel cutoff and allow the crankshaft position system variation compensating values to be stored in the PCM. The PCM must detect an engine speed of 5150 RPM during the Crankshaft Position System Variation Learn Procedure in order to store the crankshaft position system variation compensating values and complete the procedure.IMPORTANT: Block the drive wheels when performing the Crankshaft Position System Variation Learning Procedure in order to prevent personal injury. Set the vehicle parking brake when instructed by the scan tool. Quickly increase the accelerator pedal position until reaching wide open throttle and hold. During the learn procedure the PCM will automatically control the injector operation. When the RPM has reached a certain RPM the PCM will stop the fuel injectors from pulsing, until the learn procedure is finished. When the PCM has learned the crankshaft variation the fuel injectors will return to normal operation and the engine will begin to accelerate again. Release the throttle when the engine reaches the second fuel cut off. Leaving the throttle open during the fuel cut off learn procedure will allow the engine to decelerate at an even rate.