With the ignition ON and the engine OFF, observe the 5-volt Reference 1 and 2 parameters.
If all 5-volt reference components have been disconnected and a Fault is still indicated, the fault may exist in the wiring harness. The scan tool parameter would change from Fault to OK when the source of the fault is disconnected. It may be possible to locate the fault by disconnecting one component at a time from the 5-volt reference circuit while viewing the 5-Volt Reference circuit parameter on the scan tool. The ECM detects a voltage out of tolerance condition on the 5-volt reference 1 or 2 bus for more than 0.5 second. * DTCs P0641 and P0651 run continuously when the above conditions are met. * The ignition voltage is more than 5.23 volts. * The ignition is in Unlock, Accessory, Run, or Crank. * The throttle position (TP) sensor 1 and 2 The 5-volt reference 2 bus provides 5 volts to the following sensors: * The intake camshaft position (CMP) sensor * The accelerator pedal position (APP) sensor 2 * The air conditioning (A/C) refrigerant pressure sensor * The manifold absolute pressure (MAP) sensor The 5-volt reference 1 bus provides 5 volts to the following sensors: The ECM monitors the voltage on the 5-volt reference busses. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to that reference bus.
Each reference bus provides 5-volt reference circuits for more than one sensor. The engine control module (ECM) has 2 internal 5-volt reference busses called 5-volt reference 1 and 5-volt reference 2. You need to check the voltage at the sensor and see if you have this 5 volt signal at that sensor as well as the crank sensor as well. It has to do with a 5 volt reference voltage to the accelerator position sensor, which is the gas pedal.
#2006 chevy cobalt ecm replacement code
Note: If you purchased the "GM Clear Security" as part of a bundle, the relearn procedure will not be necessary.The 641 code is related to the other code as well. Jeep Grand Cherokee PCM ECM ECU TCM TCU.Dodge Ram 1500 2500 3500 PCM ECM ECU TCM TCU (Gas only).Chrysler New Yorker PCM ECM ECU Engine Computer.Chrysler Town & Country PCM ECM ECU TCM TCU.Chrysler PT Cruiser PCM ECM ECU TCM TCU.
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