DTC U3006-U3009

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC U3006 Control Module Power 1 Circuit DTC U3007 Control Module Power 2 Circuit DTC U3008 Control Module Ground 1 DTC U3009 Control Module Ground 2 Circuit/System Description The control module monitors the system voltage to ensure that it stays within the proper range. Conditions for Running the DTC Vehicle = ON or Propulsion Active Conditions for Setting the DTC Control Module Voltage = Less than 7.5 V or Greater than 16 V For greater than 5 s Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. Control Module Voltage = Disabled Conditions for Clearing the DTC System Voltage = 9 to 15 V Diagnostic Aids A low or high voltage DTC set in multiple modules may indicate a concern with the charging system. A possible cause for DTCs regarding high system voltage could be overcharging with a battery charger or jump starting. Reference Information Schematic Reference Power Distribution Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification

1. Vehicle On - Service Mode
2. Verify there are no other DTCs set, except for DTC U3006-U3009. ⇒ If any other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If only DTC U3006-U3009 is set
3. Verify DTC U3006-U3009 is not set. ⇒ If any of the DTCs are set Refer to: Circuit/System Testing ⇓ If the DTC is not set
4. Vehicle » Off

Note

The battery voltage should stabilize after a few minutes of turning the Vehicle Off

5. Test for 12.4 to 12.8 V between the test points: Battery Positive Post & Battery Negative Post ⇒ If not between 12.4 and 12.8 V Refer to: Battery Inspection/Test ⇓ If between 12.4 and 12.8 V
6. Vehicle On - , Propulsion Active— For greater than 15 s
7. Accessories » Off
8. Test for 13.4 to 15 V between the test points: Battery Positive Post & Battery Negative Post ⇒ If not between 13.4 and 15 V Refer to: Charging System Test ⇓ If between 13.4 and 15 V
9. Verify the scan tool parameter: { If available } Battery Voltage @ Appropriate control module. = Within 1 V of the battery voltage or { If available } System Voltage @ Control Module = Within 1 V of the battery voltage ⇒ If not within 1 V of each other Refer to: Circuit/System Testing ⇓ If within 1 V of each other
10. Verify the scan tool parameter: { If available } Ignition Voltage @ Control Module = Within 1 V of the battery voltage or { If available } Run/Crank Circuit Voltage @ Control Module = Within 1 V of the battery voltage ⇒ If not within 1 V of each other Refer to: Circuit/System Testing ⇓ If within 1 V of each other
11. All OK. Circuit/System Testing

Note

Use the schematics to identify the items/configurations listed below: – Control modules the vehicle is equipped with – The control module’s B+, ignition, and ground circuits – The control module’s circuit terminals and connectors Some control module ground circuits may require up to 20 min after the Vehicle is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.

1. Vehicle = OFF
2. Disconnect the electrical connector: Appropriate control module.
3. Test for less than 10 Ω between the test points: Each ground circuit terminal & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the ground connection: Ground terminal 3.2. Test for less than 2 Ω between the test points: Ground circuit terminal @ Control module harness & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Repair the open/high resistance in the ground connection. ⇓ If less than 10 Ω
4. Verify a test lamp turns On between the test points: Each B+ circuit terminal & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 4.1. Remove » Test Lamp 4.2. Test for less than 2 Ω between the test points: B+ circuit terminal @ Control module harness & Output terminal @ Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not turn On and the circuit fuse is open 4.1. Remove » Test Lamp 4.2. Test for infinite resistance between the test points: B+ circuit terminal @ Control module harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: Control Module ⇓ If the test lamp turns On
5. Vehicle On - Service Mode
6. Verify a test lamp turns On between the test points: Each ignition circuit terminal & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 6.1. Vehicle » Off & Remove » Test lamp 6.2. Test for less than 2 Ω between the test points: Ignition circuit terminal @ Control module harness & Output terminal @ Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not turn On and the circuit fuse is open 6.1. Vehicle » Off & Remove » Test lamp 6.2. Test for infinite resistance between the test points: Ignition circuit terminal @ Control module harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: Control Module ⇓ If the test lamp turns On
7. Replace the component: Control Module Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References