DTC P0641-P0643, P0651-P0653, or P0697-P0699
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DTC P0641-P0643, P0651-P0653, or P0697-P0699
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DTC P0641
5 V Reference 1 Circuit
DTC P0642
5 V Reference 1 Low Voltage
DTC P0643
5 V Reference 1 High Voltage
DTC P0651
5 V Reference 2 Circuit
DTC P0652
5 V Reference 2 Low Voltage
DTC P0653
5 V Reference 2 High Voltage
DTC P0697
5 V Reference 3 Circuit
DTC P0698
5 V Reference 3 Low Voltage
DTC P0699
5 V Reference 3 High Voltage
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Circuit/System Description
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The engine control module (ECM) has 3 internal 5 V reference busses called 5 V reference 1, 5 V reference 2, and 5 V reference 3. Each reference bus provides 5 V reference circuits for more than one sensor. Therefore, a fault condition on one 5 V reference circuit will affect the other 5 V reference circuits connected to that reference bus. The ECM monitors the voltage on the 5 V reference busses.
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Conditions for Running the DTC
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DTCs P0602, P0603, P0604, and P0606 are not set.
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The ignition is in Run, or Crank.
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The ignition voltage is more than 5.23 V.
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DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above conditions are met.
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Conditions for Setting the DTC
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P0641, P0651, and P0697
These DTCs set when the ECM detects a voltage out of tolerance condition on the 5 V reference 1, 2 or 3 bus for more than 3 s.
P0642, P0652, and P0698
These DTCs set when the ECM detects a low voltage condition on the 5 V reference 1, 2, or 3 bus for more than 3 s.
P0643, P0653, and P0699
These DTCs set when the ECM detects a high voltage condition on the 5 V reference 1, 2, or 3 bus for more than 3 s.
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Action Taken When the DTC Sets
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DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.
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Conditions for Clearing the DTC
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DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.
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The 5 V reference 1 bus provides 5 V to the following sensors:
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B74 manifold absolute pressure (MAP) sensor
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B25B clutch pedal position sensor
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B65 intake air pressure and temperature sensor
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The 5 V reference 2 bus provides 5 V to the following sensors:
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B107 accelerator pedal position (APP) sensor 1
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B23E exhaust camshaft position sensor
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B23F intake camshaft position sensor
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The 5 V reference 3 bus provides 5 V to the following sensors:
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B26 crankshaft position sensor
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B1 air conditioning (A/C) refrigerant pressure sensor
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Q38 throttle position sensor 1 and 2
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It may be possible to locate the fault by disconnecting one component at a time from the 5 V reference circuit while viewing the 5 V Reference circuit parameter on the scan tool. The scan tool parameter would change from Fault to OK when the source of the fault is disconnected.
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If all 5 V reference components have been disconnected and a Fault is still indicated, the fault may exist in the wiring harness.
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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
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Circuit/System Verification
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With the ignition ON and the engine OFF, observe the 5 V Reference 1, 5 V Reference 2, and 5 V Reference 3 parameters . The scan tool should display OK for a normally operating system.
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1.
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Note
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Additional DTCs will set when disconnecting the components.
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Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.
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2.
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Note
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A short to voltage on the signal circuit of certain components may cause this DTC to set.
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Ignition ON, measure for 4.8-5.2 V between one of the 5 V reference circuits and ground.
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3.
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If the voltage is less than the specified range, test for a short to ground on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
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If the voltage is greater than the specified range, test for a short to voltage on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
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5.
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Connect each component associated with the 5 V reference circuit, one at a time, while monitoring the voltage. Verify the voltage remains between 4.8-5.2 V.
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6.
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If not within the specified range when a component is connected, test the signal circuit for a short to voltage. If the circuit tests normal, replace the component.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
