Tech Tip: 2004-’05 Nissans Have MIL On With DTC P0300-P0306, P1273 Or P1283 – UnderhoodService

Tech Tip: 2004-’05 Nissans Have MIL On With DTC P0300-P0306, P1273 Or P1283

Technicians may encounter an MIL "On" with one or more of the following DTCs stored: P0300, P0301, P0302, P0303, P0304, P0305, P0306 (cylinder misfire); or P1273, P1283 (A/F ratio lean). Injector resistance may cause one or more of the listed DTCs to be set. Check the resistance of the injectors against the values in this bulletin.

Applied vehicles:

2004 Maxima (A34)
2004 Quest (V42)
2004-’05 Altima (L31) with VQ35 only

Concern:

An MIL “On” with one or more of the following DTCs stored:

• P0300, P0301, P0302, P0303, P0304, P0305, P0306 (cylinder misfire); or

• P1273, P1283 (A/F ratio lean).

Action:

Injector resistance may cause one or more of the above listed DTCs to be set.

• Check the resistance of the injectors against the values in this bulletin.

Note: Incident injectors will have resistance ­values:

– outside of the specified range indicated in

this bulletin and

– will be significantly different from the non-incident injectors at the other cylinders.

Important: The purpose of the Action is to give you a quick idea of the work you will be ­performing. You must closely follow the entire Service Procedure as it contains information that is ­essential to successfully completing this repair.

Service Procedure:

Use Chart 1 to determine which ­injectors to inspect.

 

DTC 1273 = Bank 1 (requires checking only that bank)

1. Locate and separate the F44 engine harness connector from the F101 injector sub-harness ­connector. See Fig. 1.

2. Using Chart 1 and the pin location in Fig. 2, measure the resistance of the ­injector(s).

 

DTC 1283 = Bank 2 (requires checking only that bank)

Important:

• Replace an injector only if its resistance is outside of the above range and the resistance is much different from the resistance of the other injectors.

– A single injector usually causes this incident. If more than one injector has resistance values out of specification:

– there might be a general problem with the accuracy of the resistance measurement, or

– component (injector) temperature condition may be high or low, or

– the vehicle is not of the ­applicable range.

DTC P0301-P0306 requires checking a single injector.

(refer to Chart 1 and the procedures used in DTC P1273 or P1283)

 

DTC P0300 (requires checking all injectors)

(refer to Chart 1 and the procedures used in DTC P1273 and P1283).

Note: It’s possible that a single injector incident:

– can affect the air/fuel sensor control for a bank of cylinders, and

– this can result in a P0300 code.

If the resistance of all the injectors is within 11.5 to 15.5 Ohms at 50-190° F (10-88° C), and the engine temperature is in the room temperature to engine warm temperature range, return to ASIST for further diagnosis.

Courtesy of Mitchell 1.

You May Also Like

Tools To Service Serpentine Belts

Servicing the serpentine belt on some vehicles is a tough task.

Servicing the serpentine belt on some vehicles is a tough task. Without the right tools it is almost impossible. Here are six tools your shop needs to make your next belt replacement more productive.

Don’t Fight It
If you are still fighting belt tensioners with 3/8” breaker bar and wrenches, there are better solutions. There are serpentine belt kits that can help you get the right angle and attachment point on a tensioner to remove the old belt and install the new belt.

Battery Charging and Diagnostics

Here are six tips to use when diagnosing a vehicle with a dead battery. 

Why Do Timing Chains Stretch?

As the timing chain wears, it can change the timing of the camshaft and crankshaft.

Carbon Deposits and Direct Injection Engines

The primary cause of these problems is that fuel and added detergents are not hitting the back of the intake valves.

Acura Turbo Engine Service

It is important to check the operation of the solenoids that control vacuum to the actuators.

Other Posts

Hybrid Vehicle Fluid Maintenance

There are opportunities your shop can’t pass up just because the car or SUV has a hybrid badge on the back.

Using a Scope

Ignition coil and plug diagnostics.

Scope-diagnostics
Repairing Wiring Harnesses

A guide to probing and poking.

Diagnostic Procedures For Stop/Start Systems

Stop/start technology is more than just a switch wired to the brake pedal and starter.