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:

    C1734 control unit
    Description An internal malfunction has been detected in the TPMS function of the BCM. DTC Logic NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information.  Activate and display TPMS trans ...

    Excessive ABS function operation frequency
    Diagnosis Procedure 1.CHECK START Check front and rear brake force distribution using a brake tester. 2.CHECK FRONT AND REAR AXLE Make sure that there is no excessive play in the front and rear axles. 3.CHECK WHEEL SENSOR AND SENSOR ROTOR Check the following: Wheel sensor installation for ...

    Brake booster
    Exploded View Master cylinder assembly Brake booster Brake pedal Lock nut Gasket Removal and installation NOTE: When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling. REMOVAL Release the fuel pressure. Refer to ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2025 Copyright www.nimainfo.com
    0.0057