DTC P0641, P0651, P0697, or P06A3 - LDE or LLU
Diagnostic Instructions
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 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. |
• |
DTCs P0697 00 and P06A3 00 are
Type C DTCs. |
Conditions for Clearing the DTC
• |
DTCs P0641 00, and P0651 00, are
Type B DTCs. |
• |
DTCs 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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the DTC information with a scan
tool. DTCs P0641 00, P0651 00, P0697 00, and
P06A3 00 should not set.
- Engine idling, observe the following circuit status
parameters:
• |
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. |
- 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.
- 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 each of
the 5 V reference circuits listed below and ground:
• |
B1 A/C Refrigerant Pressure Sensor
pin 2 |
• |
B17 Barometric Pressure Sensor
pin 1 |
• |
B23 Camshaft Position Sensor pin 1 |
• |
B25B Clutch Pedal Position Sensor
pin C |
• |
B26 Crankshaft Position Sensor
pin 3 |
• |
B65 Intake Manifold Pressure and Air
Temperature Sensor pin 3 |
• |
B74 Manifold Absolute Pressure Sensor
pin 1 |
• |
B107 Accelerator Pedal Position Sensor
pin 1 |
• |
B107 Accelerator Pedal Position Sensor
pin 2 |
• |
Q38 Throttle Body pin E |
• |
Q6E Camshaft Position Actuator Solenoid Valve
- Exhaust pin 1 |
⇒ |
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.
- 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.
⇒ |
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.
|