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DTC P0641, P0651, P0697, or P06A3

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 00: 5V Reference 1 Circuit

DTC P0651 00: 5V Reference 2 Circuit

DTC P0697 00: 5V Reference 3 Circuit

DTC P06A3 00: 5V Reference 4 Circuit

Circuit/System Description

The engine control module (ECM) has four 5 V reference circuits. The ECM provides the 5 V reference to various sensors. A short to ground or voltage on one of the 5 V reference circuits will affect all components connected to that 5 V reference circuit. The ECM monitors the voltage on the 5 V reference circuits.

Conditions for Running the DTC
    • The ignition is ON.
    • The ECM is not commanding reduced engine power.
    • The ignition voltage is greater than 6 V.
    • The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects the 5 V reference is out of range for less than 1 s.

Action Taken When the DTC Sets
    • DTCs P0641 00, and P0651 00, are Type B DTCs.
    • DTC P0697 00 and P06A3 00 are Type C DTCs.

Conditions for Clearing the DTC
    • DTCs P0641 00, and P0651 00, are Type B DTCs.
    • DTC P0697 00 and P06A3 00 are Type C DTCs.

Diagnostic Aids
    • If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected.
    • The scan tool 5 V reference parameter should display between 4.8-5.2 V.

P0641 00

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

    • The camshaft position sensor
    • The barometric pressure sensor (BARO)
    • The A/C refrigerant pressure sensor
    • The boost pressure sensor

P0651 00

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

    • The clutch pedal position (CPP) sensor
    • The crankshaft position sensor

P0697 00

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

    • The accelerator pedal position (APP) sensor 2
    • The manifold absolute pressure (MAP) sensor

P06A3 00

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

    • The accelerator pedal position (APP) sensor 1
    • The throttle body throttle position sensors 1
    • The throttle body throttle position sensor 2

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. DTCs P0641 00, P0651 00, P0697 00, and P06A3 00 should not set.
  2. Engine idling, observe the following circuit status parameters:
    3. • 5 V Reference 1 Circuit Status
    • 5 V Reference 2 Circuit Status
    • 5 V Reference 3 Circuit Status
    • 5 V Reference 4 Circuit Status
      Each 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

Note: Additional DTCs will set when disconnecting components.

  1. Ignition OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
  2. Ignition ON, test for 4.8-5.2 V between each of the 5 V reference circuits and ground:
    3. ⇒If less than the specified range, test for a short to ground on the 5 V reference circuit. If all circuits test normal, replace the K20 Engine Control Module.
    ⇒If greater than the specified range, test for a short to voltage on the 5 V reference circuit. If all circuits test normal, replace the K20 Engine Control Module.

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

  3. Connect each component associated with the 5 V reference circuit one at a time while monitoring the scan tool 5 V reference parameter. The voltage should display 5.0 V.
    4. ⇒If not the specified value, test the signal circuit of the component for a short to voltage. If the circuit tests normal, replace the component. Refer to Diagnostic Aids.

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
    •  Manifold Absolute Pressure Sensor Replacement : 1.8L 2H0 and LUW
    •  Throttle Body Assembly Replacement : 1.6L LDE, LXV, 1.8L 2H0, and LUW
    •  Crankshaft Position Sensor Replacement
    •  Camshaft Position Sensor Replacement : LDE, LXV, LUW, 2H0 and LFH
    •  Clutch Pedal Position Sensor Replacement
    • Control Module References for replacement, setup, and programming
   


© Copyright Chevrolet. All rights reserved
   


© Copyright Chevrolet. All rights reserved