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Sunteams 1500. fault, 2.5v reference voltage has a problem inside

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2007 cobaltpo651 circuit b how do i trll which is circuit b

DTC P0651: 5-Volt Reference 2 Circuit First off do you know what computer reference voltage is ? Your vehicle has 2 reference voltage circuits . This reference voltage is used to power engine sensors .
Diagnostic Fault Information
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference 2 Circuit
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference 1 Circuit
Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference 1 Circuit
Crankshaft Position Sensor 5-Volt Reference 2 Circuit
Fuel Tank Pressure (FTP) Sensor 5-Volt Reference 1 Circuit
Intake Camshaft Position Sensor 5-Volt Reference 1 Circuit
Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference 1 Circuit
Secondary Air Injection (AIR) Solenoid 5-Volt Reference 2 Circuit
P0651, P2432
P0651, P2431
Throttle Position (TP) Sensor 1 5-Volt Reference 2 Circuit
Throttle Position (TP) Sensor 2 5-Volt Reference 2 Circuit

How to check the 5v reference circuit for short to ground Cadillac

Jun 10, 2017 | Cars & Trucks

1 Answer

Voltage regulator on 5.3L 2000 chevy silverado

If you are referring to the charging regulator (there is usually another one supplying the instruments) it is usually to be found inside the alternator.
They used to be a separate unit but the Japanese and some trucks were the last ones I have seen using that method and even they began to use integrated regulators a couple of decades ago.

Feb 01, 2014 | Standard 2000 Chevrolet S10 Oe Replacement...

1 Answer

Have a PI-1500 Schumacher that I just got and trying to hook up to a litium Ion battery with charged voltage of 15.86 - lights on inverter light up(red and green) but no power output--- Is this battery...

you must be careful you can not interchange Lion and Nicad there voltages are not compatible and the intelliichargers will register a fault you must replace with same batterys recomended for your unit

Oct 24, 2013 | Schumacher PSI-1500 1500W Pwr Inverter

1 Answer

07 passat code p0642 related to other codes

code p0642 refers to ECM-knock control defective or sensor reference voltage A circuit low or system voltage- malfunction===causes for ecm is ECM--- for voltage A wiring is short to positive --- for system voltage ---wiring--poor connection--battery---alternator
code p2014 refers to intake manifold air control actuator position sensor/ switch bank 1 circuit malfunction=== causes --wiring --intake manifold air control actuator position sensor/switch
code p0106 refers to manifold absolute pressure MAP sensor/barometric pressure sensor-range/performance problem===causes--intake /exhaust leak--wiring--MAP sensor---Baro sensor.
code p0089 refers to fuel pressure regulator --performance problem===causes--fuel pressure regulator--mechanical fault. I would suggest that you have the battery load tested and the alternator checked for correct output as it may be the common reason for the codes .P0089 will not be electrical as it being a mechanical fault then the regulator needs replacing

Jul 23, 2013 | Cars & Trucks

1 Answer

Where does the crank sensor get its 12 volts from?

The voltage signal to all the sensors on and for the engine and the emission control system use a 5 volt reference voltage that is supplied by and controlled by the Powertrain control module (computer), they do not use 12 volt system voltage, so if you think that your problem is that 5 volts is to low that is not the case and you need to look elsewhere for the problem. The reason for the 5 volt reference signal is stability of sensor output signals.

Jul 13, 2012 | 2006 GMC Sierra 1500 2WD

1 Answer

Chevy colorado

Hi there:

DTC P0641 - 5-Volt Reference 1 Circuit

DTC P0651 - 5-Volt Reference 2 Circuit

Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description
The engine control module (ECM) has 2 internal 5-volt reference busses called 5-volt reference 1 and 5-volt reference 2. Each reference bus provides 5-volt reference circuits for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to that reference bus. The ECM monitors the voltage on the 5-volt reference busses.

The 5-volt reference 1 bus provides 5 volts to the following sensors:
* The manifold absolute pressure (MAP) sensor
* The fuel tank pressure (FTP) sensor
* The air conditioning (A/C) refrigerant pressure sensor
* The accelerator pedal position (APP) sensor 2
* The intake camshaft position (CMP) sensor

The 5-volt reference 2 bus provides 5 volts to the following sensors:
* The APP sensor 1
* The throttle position (TP) sensor 1 and 2
* The crankshaft position (CKP) sensor

Conditions for Running the DTC
* DTCs P0601, P0602, P0603, P0604, P0605, P0606, P0607, and P2610 are not set.
* The ignition is in Unlock, Accessory, Run, or Crank.
* The ignition voltage is more than 5.23 volts.
* DTCs P0641 and P0651 run continuously when the above conditions are met.

Conditions for Setting the DTC
The ECM detects a voltage out of tolerance condition on the 5-volt reference 1 or 2 bus for more than 0.5 second.

Action Taken When the DTC Sets
DTCs P0641 and P0651 are Type A DTCs.

Conditions for Clearing the MIL/DTC
DTCs P0641 and P0651 are Type A DTCs.

Diagnostic Aids
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 scan tool parameter would change from Fault to OK when the source of the fault is disconnected.

If all 5-volt reference components have been disconnected and a Fault is still indicated, the fault may exist in the wiring harness.

Circuit/System Verification
With the ignition ON and the engine OFF, observe the 5-volt Reference 1 and 2 parameters. The scan tool should display 4.3-4.7 volts for a normally operating system.

Circuit/System Testing
Important: Additional DTCs will set when disconnecting the components.

1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.

Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.

2. Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.

* If the voltage is less than the specified value, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module.
* If the voltage is greater than the specified value, test for a short to voltage on all the 5-volt reference circuits, or the signal circuit, for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module.

3. Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.

* If the voltage display changes more than the specified value when a component is connected, replace the component.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 12, 2012 | Chevrolet Colorado Cars & Trucks

2 Answers

Hi, i have a 5kw sunteams inverter that regularly comes up with "hi dc inject" with red led "fault" light and shuts down the output. This is the 3rd inverter i have had in 10 months...

hi, I also get one sunteams inverter, it works quite well. One month ago it had High DC problem and I contacted the manufacture and this problem was solved. you can contact them at

Jun 15, 2011 | Electronics - Others

1 Answer

Why my truck keep saying engine reduce power,and my traction light comes on and my truck can't pick up speed

You are in fail safemode the APP The app sesnor is made up of 2 sensor that are housed inside one assemble. Both APP sensor 1 and 2 signal voltages at rest position are near the low voltage reference and increase as pedal is actuated. Before a APP si condemd try this GM has a mass air cleaner try cleaning it first then clean throttle body see if that improve drivability

Apr 22, 2011 | 2008 GMC Sierra 1500 2WD

1 Answer

When i connect my adapter to my computer the LED goes off but when i disconect the LED goes back on. my computer does not start.

Unless the set is opend to probe inside the fault cannot be confirmed.
So the mother board seems to have short in the board and so the adapter when plugged in shorts. you must check the adapter for voltage, the battery for voltage, if not check if faulty.
Refer to my tips on laptop adaptor failure in my tips profile.
If the power section is checked the fault can be found or else the mother board is faulty.

Oct 01, 2010 | HP ProBook 4510s Notebook

1 Answer

Microwave blowing fuses when setting programme

suspect high tension diode or bleed diode faulty. easy to replace but!!!!!!!!!!!!!!!!!!



Jul 05, 2008 | Neff H7871N2GB Convection / Microwave Oven

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