Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSENGINE CONTROLS - DTC P0603 DIAGNOSTIC INFORMATION
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
Engine Controls - DTC P0603 Diagnostic Information
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION Engine Controls - DTC P0603 Diagnostic Information
Classification: EC08-027a
Reference: ITB09-006a
Date: February 26, 2009
DIAGNOSIS PROCEDURE FOR MIL "ON" DTC P0603 ECM POWER SUPPLY
The Claims Information section of this bulletin has been amended. No other content has changed. Discard all earlier versions of this bulletin.
APPLIED VEHICLES:
2006-2008 FX (S50)
2009 FX (S51)
2006 G35 Sedan (V35)
2006-2007 G35 Coupe (CV35)
2007-2008 G35 Sedan (V36)
2008-2009 G37 Coupe (CV36)
2009 G37 Sedan (V36)
2006-2009 M (Y50)
2008 EX35 (J50)
2006 Q45 (F50)
SERVICE INFORMATION
If you have a vehicle with the MIL "ON" that has a DTC P0603 stored in the ECM:
^ Perform the diagnostic steps in this bulletin FIRST.
^ This DTC may have been stored due to a series of previous low battery voltage, dead battery or battery terminal disconnections.
^ DO NOT perform any other diagnostic procedures or repairs for this code until you have performed the ones in this bulletin.
^ See the Service Procedure in this bulletin for further detail.
CLAIMS INFORMATION
SERVICE PROCEDURE
1. Connect CONSULT III to vehicle.
2. Turn ignition "ON" but Do Not Start engine.
3. Check for DTC's.
^ Confirm DTC P0603 is stored. If P0603 is not stored, this TSB does not apply.
^ If additional DTC's are stored, document the DTC's before proceeding.
4. Erase all DTC's. Confirm that ENGINE has no DTC stored.
5. Turn ignition "OFF". Wait exactly 5 minutes* after the display changes from "No DTC" TO "Error".
NOTE:
*This waiting period is necessary for the ECM to completely shut off.
6. Turn ignition to "ON", but Do Not Start engine. Wait 10 seconds after the display changes from "Error" to "No DTC".
7. Repeat step 5 and 6 five (5) more times to complete the system check.
8. Refer to the appropriate Electronic Service Manual for further DTC P0603 diagnostic assistance.
^ Apply standard warranty claims procedures for repairs of DTC P0603 using ESM procedures. These repairs are not covered under this bulletin
9. If other DTC's were previously stored, refer to the appropriate Electronic Service Manual for further diagnostic assistance for those DTCs.
^ Apply standard warranty claims procedures for any additional repairs of DTCs using ESM procedures. These repairs are not covered under this bulletin.
Reference: ITB09-006a
Date: February 26, 2009
DIAGNOSIS PROCEDURE FOR MIL "ON" DTC P0603 ECM POWER SUPPLY
The Claims Information section of this bulletin has been amended. No other content has changed. Discard all earlier versions of this bulletin.
APPLIED VEHICLES:
2006-2008 FX (S50)
2009 FX (S51)
2006 G35 Sedan (V35)
2006-2007 G35 Coupe (CV35)
2007-2008 G35 Sedan (V36)
2008-2009 G37 Coupe (CV36)
2009 G37 Sedan (V36)
2006-2009 M (Y50)
2008 EX35 (J50)
2006 Q45 (F50)
SERVICE INFORMATION
If you have a vehicle with the MIL "ON" that has a DTC P0603 stored in the ECM:
^ Perform the diagnostic steps in this bulletin FIRST.
^ This DTC may have been stored due to a series of previous low battery voltage, dead battery or battery terminal disconnections.
^ DO NOT perform any other diagnostic procedures or repairs for this code until you have performed the ones in this bulletin.
^ See the Service Procedure in this bulletin for further detail.
CLAIMS INFORMATION
SERVICE PROCEDURE
1. Connect CONSULT III to vehicle.
2. Turn ignition "ON" but Do Not Start engine.
3. Check for DTC's.
^ Confirm DTC P0603 is stored. If P0603 is not stored, this TSB does not apply.
^ If additional DTC's are stored, document the DTC's before proceeding.
4. Erase all DTC's. Confirm that ENGINE has no DTC stored.
5. Turn ignition "OFF". Wait exactly 5 minutes* after the display changes from "No DTC" TO "Error".
NOTE:
*This waiting period is necessary for the ECM to completely shut off.
6. Turn ignition to "ON", but Do Not Start engine. Wait 10 seconds after the display changes from "Error" to "No DTC".
7. Repeat step 5 and 6 five (5) more times to complete the system check.
8. Refer to the appropriate Electronic Service Manual for further DTC P0603 diagnostic assistance.
^ Apply standard warranty claims procedures for repairs of DTC P0603 using ESM procedures. These repairs are not covered under this bulletin
9. If other DTC's were previously stored, refer to the appropriate Electronic Service Manual for further diagnostic assistance for those DTCs.
^ Apply standard warranty claims procedures for any additional repairs of DTCs using ESM procedures. These repairs are not covered under this bulletin.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.