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DTC P0641, P0651, P0697, or P06A3 (ECM)

DTC P0641, P0651, P0697, or P06A3 (ECM)

Diagnostic Instructions


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

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0641

5 V Reference 1 Circuit

DTC P0651

5 V Reference 2 Circuit

DTC P0697

5 V Reference 3 Circuit

DTC P06A3

5 V Reference 4 Circuit

Circuit/System Description

The engine control module (ECM) has 4 internal 5 V reference circuits. Each internal reference circuit provides 5 V reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 V reference circuit can affect all the components connected to the same internal 5 V reference circuit.

Conditions for Running the DTC


System voltage is greater than 6.4 V.

Reduced engine power is not active.

DTCs P0641, P0651, P0697, P06A3 run continuously when the above conditions are met.


Conditions for Setting the DTC

The 5 V reference circuit voltage is greater or less than a predetermined threshold.

Action Taken When the DTC Sets

DTCs P0641, P0651, P0697, and P06A3 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0641, P0651, P0697, and P06A3 are Type A DTCs.

Diagnostic Aids

DTC P0641

The 5 V reference 1 circuit provides 5 V to the following sensors:


Fuel tank pressure (FTP) sensor

Fuel rail pressure (FRP) sensor

A/C refrigerant pressure sensor

Exhaust camshaft position sensor

Intake camshaft position sensor

Turbocharger boost sensor, intake air pressure and temperature sensor


DTC P0651

The 5 V reference 2 circuit provides 5 V to the following sensors:


Clutch pedal position sensor, if equipped

Crankshaft Position Sensor

Turbocharger inlet pressure sensor, throttle inlet absolute pressure sensor


DTC P0697

The 5 V reference 3 circuit provides 5 V to the following sensors:


Manifold absolute pressure (MAP) sensor

Accelerator pedal position sensor 2


DTC P06A3

The 5 V reference 4 circuit provides 5 V to the following sensors:


Throttle position sensor

Accelerator pedal position sensor 1


It may be possible to locate the fault by disconnecting one component at a time from the affected 5 V reference circuit while viewing the 5 V Reference Circuit parameter on the scan tool. The scan tool parameter would change from Malfunction to OK when the source of the fault is disconnected. If all 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, observe the DTC information with a scan tool. DTC P0641, P0651, P0697, or P06A3 should not be set.

2. Observe the appropriate scan tool 5 V Reference Circuit Test Status parameter. The parameter should display OK.

3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.


Circuit/System Testing


1.
Note

Additional DTCs will set when disconnecting the components.


Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.

2. Ignition ON, test for 4.8-5.2 V between one of the affected 5 V reference circuits and ground.

3. If the voltage is less than the specified range, test for a short to ground on the 5 V reference circuit for each of the affected components. If all circuits test normal, replace the K20 ECM.

4. If the voltage is greater than the specified range, test for a short to voltage on the 5 V reference circuit for each of the affected components. If all circuits test normal, replace the K20 ECM.

5.
Note

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


Connect each component associated with the affected 5 V reference circuit one at a time while monitoring the appropriate scan tool 5 V Reference Voltage parameter. Verify the voltage remains between 4.8-5.2 V.

6. If not the specified range when a component is connected, test the signal circuit of that component for a short to voltage. If the circuit tests normal, replace the component.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Accelerator Pedal Position Sensor Replacement

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (Diesel) Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LAU/A28NER) Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LLU/A16LET) Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LHU/A20NFT)

Camshaft Position Sensor Replacement - Intake

Camshaft Position Sensor Replacement - Exhaust

Crankshaft Position Sensor Replacement

Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement

Fuel Tank Pressure Sensor Replacement

Intake Air Pressure and Temperature Sensor Replacement

Manifold Absolute Pressure Sensor Replacement

Throttle Body Assembly Replacement

Control Module References for Engine Control Module replacement, setup, and programming