DTC P0641, P0651, or P0697
Diagnostic Instructions
DTC Descriptors
DTC P0641 00: 5V Reference 1 Circuit
Malfunction |
DTC P0651 00: 5V Reference 2 Circuit
Malfunction |
DTC P0697 00: 5V Reference 3 Circuit
Malfunction |
Circuit/System Description
The engine control module (ECM) has 3 5 V reference circuits.
The ECM provides the 5 V reference to various sensors. Each
reference circuit provides a 5 V reference for greater than one
sensor. 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 DTCs run continuously when
the above condition is met. |
Conditions for Setting the DTC
The control module detects a voltage above 5.5 V, or below 4.5
V, on any of the 5 V reference circuits for greater than 0.5 s.
Action Taken When the DTC Sets
• |
DTCs P0641, P0651, and P0697
are Type B DTCs. |
• |
The ECM commands the throttle
actuator control (TAC) system to operate in a Reduced Engine Power
mode. |
Conditions for Clearing the DTC
DTCs P0641, P0651, and P0697 are Type B 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
circuit status parameter should display OK. |
P0641
The 5 V reference 1 circuit provides 5 V to the accelerator pedal
position (APP) sensor 2, A/C refrigerant pressure sensor, throttle
position sensor, exhaust gas recirculation (EGR) valve,
turbocharger vane position sensor, clutch pedal position (CPP)
sensor and diesel particulate filter pressure sensor.
P0651
The 5 V reference 2 circuit provides 5 V to the accelerator pedal
position (APP) sensor 1, camshaft position sensor, turbocharger
boost pressure sensor and fuel rail pressure sensor.
P0697
The 5 V reference 3 circuit provides 5 V to the Glow Plug/Pressure
Sensor Assembly.
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
1. |
Ignition ON, observe the DTC
information with a scan tool. DTCs P0641, P0651, and P0697 should
not set. |
2. |
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 the 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 4.6-5.4
V between the 5 V reference circuit and ground. |
⇒ |
If the voltage is less than the specified range,
test the 5 V reference circuit for a short to ground. If all
circuits test normal, replace the K20 Engine Control Module. |
⇒ |
If greater than the specified range, test the 5 V
reference circuit for each component associated with the 5 V
reference circuit for a short to voltage. 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. |
Observe the scan tool that the
appropriate DTC is not set while connecting each component
associated with the 5 V reference circuit one at a time.
|
⇒ |
If the DTC sets when a component is connected,
test the signal circuit for a short to voltage. If all circuits
test normal, replace the component. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|