DTC 45 - Diagnosis Procedures: Overview
Classification: EC95-01Reference: ITB95-O20
Date: April 5, 1995
DECREASED ENGINE DRIVEABILITY and/or CHECK ENGINE LIGHT ON (CODE 45- INJECTOR LEAK)
APPLIED VEHICLES All Infiniti vehicles (except OBD-II equipped vehicles)
SERVICE INFORMATION
This bulletin outlines procedures and methods to isolate the cause(s) of mixture related driveability incidents. The bulletin also covers incidents where the cheek engine light is illuminated and code 45 is stored, but there are no driveability symptoms.
SERVICE PROCEDURE
NOTE:
^ ANY SENSOR INPUT THAT CAN CAUSE A "RICH" FUEL SIGNAL CAN CAUSE AN INJECTOR LEAK CODE.
^ ANY CAUSE FOR EXCESSIVE FUEL PRESSURE CAN CAUSE AN INJECTOR LEAK CODE.
The best way to resolve a Code 45 or driveability incident is to carefully go through ALL the following steps:
1. CONSULT ALPHA TEST
2. MASS AIR FLOW SENSOR TEST
3. FUEL PRESSURE REGULATOR TEST
4. INJECTOR LEAK DOWN TEST
5. ENGINE COOLANT TEMPERATURE SENSOR TEST
6. OXYGEN (02) SENSOR TEST
7. QUALITY CONTROL CHECK