Chevrolet Trax: 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
5V Reference 1 Circuit
DTC P0651
5V Reference 2 Circuit
DTC P0697
5V Reference 3 Circuit
DTC P06A3
5V Reference 4 Circuit
Circuit/System Description
The engine control module (ECM) has 4 internal 5V reference circuits. Each
internal reference circuit provides
external 5V reference circuits for more than one sensor. A short to ground or
short to voltage on one external
5V reference circuit can affect all the components connected to the same
internal 5V reference circuit.
Conditions for Running the DTC
These DTCs run continuously when the ignition voltage is greater than 6.4 V.
Conditions for Setting the DTC
The ECM detects a short to ground or voltage on any of the 5V reference
circuits for greater than 0.5 s.
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
P0641
The 5V reference 1 circuit provides 5 V to sensors listed below:
- Air conditioning (A/C) refrigerant pressure sensor
- Exhaust and intake camshaft position sensors
- Fuel tank pressure sensor
- Multifunction intake air sensor
P0651
The 5V reference 2 circuit provides 5 V to the sensors listed below:
- Brake pedal position sensor (automatic transmission)
- Clutch pedal position sensor (manual transmission)
- Crankshaft position sensor
- Intake manifold pressure and air temperature sensor
- Transmission output shaft speed sensor (manual transmission)
P0697
The 5V reference 3 circuit provides 5 V to the sensors listed below:
- Accelerator pedal position sensor 2
- Manifold absolute pressure sensor
P06A3
The 5V reference 4 circuit provides 5 V to the sensors listed below:
- Accelerator pedal position sensor 1
- Throttle position sensor 1 and 2
Disconnecting one component at a time from the affected 5V reference circuit
while observing the scan tool 5V
Reference Circuit Status parameter may help locate the fault. The scan tool
parameter will change from
Malfunction to OK when the source of the fault is disconnected. If all 5V
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 (Encore) , Engine Controls Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Component View Reference
Powertrain Component 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 (LUV) ,
Powertrain Diagnostic Trouble Code
(DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify all scan tool 5V Reference Circuit Status parameters do not
display Malfunction.
- If Malfunction is displayed
Refer to Circuit/System Testing.
- If Malfunction is not displayed
- Operate the vehicle within the Conditions for Running the DTC. You may
also operate the vehicle within
the conditions that you observed from the Freeze Frame/Failure Records data.
- Verify the DTC does not set.
Refer to Circuit/System Testing.
- All OK.
Circuit/System Testing
NOTE: Additional DTCs will set when disconnecting the components.
- Ignition OFF, disconnect the harness connector at all appropriate
sensors for the applicable DTC. Refer to
Diagnostic Aids.
- Ignition ON.
- Test for 4.8-5.2 V between one of the 5V reference circuits and ground.
- Ignition OFF, disconnect the harness connectors at the K20 Engine
Control Module.
- Test for infinite resistance between the 5V reference circuit for each
applicable component and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K20 Engine Control Module.
- If greater than 5.2 V
- Ignition OFF, disconnect the harness connectors at the K20 Engine
Control Module.
- Test for less than 1 V between the 5V reference circuit for each
applicable component and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 4.8-5.2 V
NOTE: A short to voltage or ground on the signal circuit of
certain components
may cause this DTC to set.
- Verify the appropriate scan tool 5V Reference 1, 2, 3, or 4 Circuit
Status parameter displays OK while connecting each component associated with
the 5V reference circuit one at a time.
- If OK is not displayed when a component is connected
Replace the component
- If OK is displayed after all components have been connected
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Accelerator Pedal Position Sensor Replacement
- Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LUJ, LUV)
, Air Conditioning
(A/C) Refrigerant Pressure Sensor Replacement (2H0)
- Brake Pedal Position Sensor Replacement
- Camshaft Position Sensor Replacement
- Crankshaft Position Sensor Replacement
- Fuel Tank Pressure Sensor Replacement
- Intake Air Pressure and Temperature Sensor Replacement
- Manifold Absolute Pressure Sensor Replacement
- Mass Airflow Sensor Replacement
- Throttle Body Assembly Replacement
- Control Module References for engine control module replacement,
programming, and setup.
READ NEXT:
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.
Diagn
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.
Diag
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.
Diag
SEE MORE:
Fig. 67: Air Inlet Assembly
Air Inlet Assembly Replacement
BLOWER MOTOR CONTROL MODULE REPLACEMENT
Fig. 68: Blower Motor Control Module (With C67)
Blower Motor Control Module Replacement
AIR INLET VALVE ACTUATOR REPLACEMENT (CJ2 C67)
Fig. 69: Air Inlet Valve Actuator (CJ2 C67)
Air Inlet Va
Voice Command Button
Blue OnStar Button
Emergency Button
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