Fuel System - MIL ON/Misfire DTC's/DTC's P1273/P1283

Classification:
EC04-024a

Reference:
NTB04-090A

Date:
October 21, 2004

2004 MAXIMA, QUEST, ALTIMA, 2005 ALTIMA; MIL "ON" WITH DTC P0300-P0306, P1273 OR P1283

This bulletin has been amended. Please discard all previous copies.

APPLIED VEHICLES:
2004 Maxima (A34)
2004 Quest (V42)
2004-2005 Altima (L31) with VQ35 Only

IF YOU CONFIRM:

A MIL "ON" with one or more of the following DTC's stored

^ P0300, P0301, P0302, P0303, P0304, P0305, P0306 (cylinder misfire).

^ P1273, P1283 (A/F ratio lean).

ACTION:

Injector resistance may cause one or more of the above listed DTC's to be set.

^ Check the resistance of the injectors against the values in chart figure 1 in service procedure.

NOTE:
Incident injector will have resistance value:

^ outside of the specified range shown in this bulletin

AND

^ The much different from the non-incident injectors at the other cylinders.

IMPORTANT:
The purpose of ACTION (above) 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.





PARTS INFORMATION





CLAIMS INFORMATION

SERVICE PROCEDURE





Use the chart shown (Figure 1) to determine which injectors to inspect.

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





1. Locate and separate two connectors: the F44 engine harness connector from F101 injector sub-harness connector.





2. Using the chart (Figure 1) and Pin location (Figure 3) 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 Figure 1 and procedures used in DTC P1273 or P1283)

DTC P0300 (requires checking all injectors)
(refer to Figure 1 and procedures used in DTC P1273 and P1283).

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





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