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DTC P0630 - LDD > < Alcohol/Contaminants-in-Fuel Diagnosis - LDD or LUJ

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DTC P0641, P0651, P0697, or P06A3 (LDD)

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.
•  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 actuator solenoid valve - exhaust sensor
•  The camshaft position actuator solenoid valve - intake sensor
•  The A/C refrigerant pressure sensor air

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

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:
  •  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 5V reference circuits listed below and ground:
  •  Q6F Camshaft Position Actuator Solenoid Valve - Intake pin 1
  •  Q6E Camshaft Position Actuator Solenoid Valve - Exhaust pin 1
  •  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 D and E
  •  B26 Crankshaft Position Sensor pin 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.
⇒ 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.

•  Control Module References for replacement, setup, and programming

DTC P0630 - LDD > < Alcohol/Contaminants-in-Fuel Diagnosis - LDD or LUJ