AfterMarketNews Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service Speedville

Honda Civic: Failed PCMs And CAN System Diagnostics

It’s not unusual for me to get help requests through my e-mail. Sometimes it’s from working technicians, other times it’s from vehicle owners who can’t get their problems solved through professional repair shops. In early 2014, I received one...

Read more...

Servicing Mercedes-Benz AIRMATIC Suspensions

The Mercedes-Benz AIRMATIC suspension system was introduced in 1999 on the S-Class and has subsequently been used on the E-Class and most of the automaker’s SUVs. The system employs electronically controlled air springs that provide an ideal balance...

Read more...

Mazda: Performing Regular Undercar Maintenance

In this article, we’ll take a look at brake and undercar service on the Mazda vehicle lineup, with the footnote that even though this type of work ­becomes routine when you have a preventive maintenance mindset, good work habits from beginning to end...

Read more...

The Ins And Outs Of Sanders

Sanders are required tools in today’s collision repair shop. Body techs and painters rely upon them every day to achieve that perfect finish on your customers’ vehicles. Whether you’re prepping a panel for paint or removing imperfections before...

Read more...

Are You Regularly Maintaining Your Equipment?

Technicians who are idling because the welder won’t feed wire, the hydraulic ram won’t pull chains, the booth heater won’t heat or the air compressor won’t compress enough air is a costly mistake, as labor time is the most expensive thing in any...

Read more...

Celebrate 'Back To The Future' Day By Watching The Time Machine Get A 2015 Detail

    For many today is just another Wednesday, but for a lot of people it is more than just your average Wednesday, it is "Back to the Future" Day. It is a day that everyone who watched the cult classic trilogy Back to the Future recognizes...

Read more...

Solving Carbon Deposits In Direct Fuel Injection Engines

Symptom: Misfire codes, stumbling and suspicious fuel trim numbers. On a scan tool, the engine may show a loss in volumetric efficiency. The driver may complain about a loss of power, poor fuel economy and hard starts. Cause: Carbon deposits on...

Read more...

Using Your Oscilloscope: Current Ramp Test Ignition Coils

Regardless of design configuration, the role of the ignition coil is to multiply battery voltage into high voltage. Following Ohm’s law for the conversion of volts to amperes, oil-filled coils generally require 3 to 5 amperes of primary current...

Read more...

Serial Data Bus Diagnostics

Understanding The Function of Serial Data Buses If serial data buses did not exist, a wiring harness would have to be five times its normal size and use twice as many sensors to deliver the same level of functionality and safety we see in the modern...

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.
Latest articles from our other sites:

GF-6 Oil Specification: What It Means For Your Shop

The Obama Administration finalized fuel economy standards in 2012 designed to increase fuel efficiency standards to 54.5 mpg for passenger cars and light-truck applications by 2025. This push for greater...More

Summer Vacation Insurance: Catch a System Failure Before it Interrupts Your Customers’ Travel Plans

The typical family vacation might start with a trip to your shop to get the oil changed and the vehicle inspected. Taking the extra time to inspect the belts and hoses can make for a trouble-free vacation...More

Registration Open for ETI’s 36th Tech Week

Since 1947, the Equipment and Tool Institute has been meeting with automakers in order to fulfill one of the association’s most important goals, which is to provide member companies an ongoing stream...More

STAR EnviroTech Sponsors U.S. Military Veteran Automotive Scholarship

STAR EnviroTech is working with the University of the Aftermarket Foundation (UAF) to fund a Military Veteran Automotive Scholarship. The scholarship is open to any active or honorably discharged...More

Continental Announces New VDO Xtreme LED Tachometer

Continental Commercial Vehicles & Aftermarket has announced the new VDO Xtreme LED Tachometer for street rod and hot rod enthusiasts. The company says it provides easy programmability, a top range...More

GM TPMS Tips

Shops should use a TPMS tool that can reset the sensor positions after rotation. There is a method in the owner’s manual to “match” the sensors that involves deflating a tire for eight seconds. On...More