Nissan Maxima Service and Repair Manual: P0603 ECM power supply

Description

Nissan Maxima. Description

Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.

DTC Logic

DTC DETECTION LOGIC

Nissan Maxima. DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON and wait at least 10 second.
  2. Turn ignition switch OFF and wait at least 5 minutes.
  3. Turn ignition switch ON, wait at least 10 seconds.
  4. Repeat steps 2 and 3 for five times.
  5. Check 1st trip DTC.

Diagnosis Procedure

1.CHECK ECM POWER SUPPLY

Nissan Maxima. CHECK ECM POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the voltage between ECM harness connector and ground.

Nissan Maxima. CHECK ECM POWER SUPPLY

2.DETECT MALFUNCTIONING PART

Check the following.

  • 15 A fuse (No. 42)
  • IPDM E/R harness connector F10
  • Harness for open or short between ECM and battery

3.CHECK INTERMITTENT INCIDENT

4.PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON.
  2. Erase DTC.
  3. Perform DTC CONFIRMATION PROCEDURE.

5.REPLACE ECM

  1. Replace ECM.
    P0550 PSP sensor
    Description Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the po ...

    P0605 ECM
    Description The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine DTC Logic DTC DETECTION LOGIC DTC CONFIRMATIO ...

    Other materials:

    M&A branch line circuit
    Diagnosis Procedure 1.CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the combination meter for damage, bend and loose connection (unit side and connector side). 2.CHECK HARNESS FOR OPEN CI ...

    Service data and specifications (SDS)
    General Specification (Rear) Wheel Alignment (Unladen*1) *1: Fuel, engine coolant, and lubricants are full. Spare tire, jack, hand tools, and mats are in designated positions. *2: 18" tire. *3: 19" tire. Ball Joint Wheelarch Height (Unladen*1) *1: Fuel, engine coolant, and lub ...

    Precaution
    Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2021 Copyright www.nimainfo.com
    0.0133