AfterMarketNews Auto Care Pro AutoProJobs Auto-Video.com Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service

Second-rate parts mean second-rate results

When it comes to diagnosing a problem, one of the biggest mistakes is thinking that the problem is gone after you’ve installed a new part. I’ve had vehicles brought in countless times with the same old story attached to them. The customer will say:...

Read more...

GearWrench Launches Street Team, a New Mobile Driver Program

GearWrench, a premier hand tool brand from Apex Tool Group, has announced Street Team, a new program that gives independent mobile distributors the support of an established tool brand without the restrictions of a franchise. "Response to the program...

Read more...

AUTO 7 Named Approved Vendor For Automotive Parts Associates

Steven Kruss, president of Auto 7, which supplies Korean-made, OEM-quality automotive parts to distributors across North America, announced that Auto 7 has been named an approved vendor of Automotive Parts Associates (APA), one of the nation’s...

Read more...

Internal Engine Oil Consumption Diagnostics

Due to the variables in engine design and ­operating conditions, internal engine oil ­consumption complaints are often the most difficult to solve. In some cases, oil consumption might be more severe under low-speed operation, in other cases, high-speed...

Read more...

Hyundai Fuel System, Emissions Diagnostics

Hyundai has done a good job of improving its ­offerings over the years from both an aesthetic and mechanical viewpoint. Complemented by a strong warranty and good value, the carmaker has been able to increase its market share year over year. If you aren’t...

Read more...

Curing Volvo Manual Transmission Rattle

In an effort to increase fuel efficiency, today’s engines produce more torque so they can be ­driven at extremely low rpm. ­Reduced viscosity engine and gearbox oils, less vehicle weight and improved aerodynamics also contribute to better fuel economy....

Read more...

Talk To All Available Modules With Autel's MaxiDiag Elite MD802

Derived from Autel’s Professional Series tool, the MaxiDAS DS708, the MaxiDiag Elite MD802 enables the user to not only get into the OE enhanced OBD II system with mode 6 access and live data graphing, but it also allows a technician to scan the...

Read more...

Reflashing & Reprogramming Tools

In the first half of 2014, NHTSA has issued more than 15 recalls where the fix was to reflash a module on a vehicle. In the same time frame, more than 100 TSBs have also been issued where the solution is to reflash a module. These recalls and TSBs...

Read more...

Pulling Codes: An Advanced Misfire Story The Story of P0301

This article will document code P0301 — Misfire Activity on Cylinder No. 1 — a code many of you have run into, but sometimes we have case studies that are worthy of mention. Our subject vehicle is a 2007 Mercury Mountaineer. The vehicle has...

Read more...

The Why, Where, When of TPMS Sensors

To understand any TPMS relearn procedure, you have to understand this: Sensors only transmit, they do not receive. No vehicle asks a sensor for information on how it is doing. I know you’re thinking a sensor does receive signals when the vehicle...

Read more...

Most Common Causes of Misfire Codes

A flashing check engine light and a P0301 to P0312 diagnostic trouble code (DTC) is a surefire indication that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels...

Read more...

Pattern Failures of MAF and MAP Sensors

Pattern failures are those failures that happen over and over again — and the same applies to how customers describe these failures. Customers might unknowingly give you the answer to their problem without needing to open the hood. In this article,...

Read more...

Home DriveTrain Tech Tip: Nissan MIL On, DTC P0603 – ECM Power Supply

Print Print Email Email

Applied Vehicles:
2006 Altima (L31)
2006-’07 Murano (Z50)
2006-’08 Maxima (A43), 350Z (Z33)
2006-’09 Sentra (B16), Frontier (D40), Xterra (N50), Pathfinder (R51), Titan (A60), Armada (TA60), Quest (V42)
2007-’09 Versa (C11), Altima (L32), Altima Hybrid (L32HV),
2008-’09 Altima Coupe (CL32), Rogue (S35)
2009 Maxima (A35), 350Z Roadster (Z33), Murano (Z51), 370Z (Z34), GT-R (R35)

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. figure 1
– 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 ­additional detail.

Service Procedure:
1. Connect Consult III to the vehicle. 

2. Turn the ignition to On, but do not start the engine. figure 2

3. Check for DTCs: (see Fig. 1)
– Confirm that DTC P0603 is stored. If P0603 is not stored, this TSB does not apply.
– If any additional DTCs are stored, document the DTCs before proceeding.

4. Erase all DTCs. Confirm that the engine has no DTC stored. See Fig. 2.

5. Turn off the ignition. Wait exactly 5 minutes after the display changes from “No DTC” To “Error.” See Fig. 3. figure 3
Note: This waiting period is necessary for the ECM to completely shut off. Do not disconnect either battery cable at any time during this procedure. 

6. Turn the ignition to On, but do not start the ­engine. Wait 10 seconds after the display changes from “Error” to “No DTC.” See Fig. 4.
If DTC P0603 does not display after the system check:Figure 4
• This will indicate P0603 was caused by a series of previous low battery voltage, dead battery or battery terminal disconnections.
• The vehicle harness, connections and ECM are operating properly. 
• Do not replace the ECM. No further action is necessary concering P0603.
• Go to step 9.
If DTC P0603 does display after the system check:
• Go to step 8.

7. Repeat step 5 and 6 five more times to complete the system check.

8. Refer to the appropriate electronic service manual for further DTC P0603 diagnostic assistance.

9. If other DTCs were previously stored, refer to the appropriate electronic service manual for further ­diagnostic assistance for those DTCs.

Courtesy of Mitchell 1.

The following two tabs change content below.

Brake and Front End Staff

Latest articles from our other sites:

PaceSetter Performance Products Offers California Legal Direct-Fit Catalytic Converter For 1999 Volkswagen Beetle, 2.0L Engine

PaceSetter Performance Products, designers and manufacturers of quality-made, affordably-priced exhaust systems and components, now offers a direct-fit catalytic converter for the 1999 Volkswagen Beetle...More

Spectra Premium Announces Engine Management Customer Satisfaction Warranty

Spectra Premium Industries has announced a new customer satisfaction warranty on its mass air flow sensors, ignition coils, distributors, cam and crank sensors and synchronizers, effective immediately. Spectra...More

Internal Engine Oil Consumption Diagnostics

Due to the variables in engine design and ­operating conditions, internal engine oil ­consumption complaints are often the most difficult to solve. In some cases, oil consumption might be more severe...More

Hyundai Fuel System, Emissions Diagnostics

Hyundai has done a good job of improving its ­offerings over the years from both an aesthetic and mechanical viewpoint. Complemented by a strong warranty and good value, the carmaker has been able to...More

OTC Releases Smart Battery Tester

OTC has launched the 3200 Smart Battery Tester, offering near-instant battery, charging and starting system test results with a technician’s iOS or Android device. The tester clips onto a battery’s...More

Ernst Offers Socket Boss Universal Twist Lock Socket Tray

Versatility is a must for organizing any socket set. Capitalize on maximum configuration possibilities with the new Universal Twist-Lock Socket Tray from Ernst. Individual rails can be removed or switched...More

Hyundai: Engine Oil Pump Replacement Guidelines During Engine Replacement

Applicable Vehicles: All models Follow the guidelines outlined in this bulletin to install a new oil pump after an internal engine repair or engine short block replacement. Note: A new or remanufactured...More

The Why, Where, When of TPMS Sensors

To understand any TPMS relearn procedure, you have to understand this: Sensors only transmit, they do not receive. No vehicle asks a sensor for information on how it is doing. I know you’re thinking...More