Nissan Murano: Dtc/circuit Diagnosis / P0603 Ecm

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / P0603 Ecm

DTC Description

DTC DETECTION LOGIC

  • ECM back up system does not function properly.

  • EEPROM (built-in microcomputer) system internal ECM does not function properly.

DTC

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
P0603

ECM BACK UP/CIRCUIT

[Internal Control Module Keep Alive Memory (KAM) Error] 		Diagnosis condition Ignition switch ON
Signal (terminal) —
Threshold ECM back up system does not function properly
Diagnosis delay time —
P062F

CONTROL MODULE

(Internal control module EEPROM error) 		Diagnosis condition Start engine and let it idle
Signal (terminal) —
Threshold EEPROM (built-in microcomputer) system internal ECM does not function properly
Diagnosis delay time —

POSSIBLE CAUSE

DTC P0603

  • Harness or connectors

    [ECM power supply circuit is open or shorted.]

  • ECM

DTC P062F

  • Harness or connectors

    [ECM power supply circuit is open or shorted.]

  • ECM

FAIL-SAFE

Engine operating condition in fail-safe mode
DTC Fail safe mode Nissan Murano Vehicle behavior
P0603 ECM Engine torque may be limited.
DTC Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 11 V  or more with ignition switch ON.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON and wait at least 1 second.

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

  3. Repeat step 1 and 2 for 10 times.

  4. Turn ignition switch ON.

  5. Check 1st trip DTC.

Is DTC P0603 detected?

YES>>

Proceed to Diagnosis Procedure.

NO>>

INSPECTION END

Diagnosis Procedure

INSPECTION START

Check that the battery negative terminal is not disconnected during ignition switch ON.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

ERASE DTC

  1. Start the engine and let it idle at least 10 seconds.

  2. Turn ignition switch OFF.

  3. Repeat steps 1 and 2 for 4 times.

  4. Erase DTC.

  5. Turn ignition switch OFF and wait at least 10 seconds.

  6. Start the engine and let it idle for 10 seconds.

  7. Check 1st trip DTC.

Is DTC P062F detected again?

YES>>

Replace ECM. Refer to Removal and Installation.

NO>>

INSPECTION END

CHECK ECM POWER SUPPLY AND GROUND CIRCUIT

Perform trouble diagnosis for ECM power supply, ground, Battery terminal tightness, Fuse, ECM relay and connector pin pressure. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON.

  2. Erase DTC.

  3. Perform DTC confirmation procedure. Refer to DTC Description.

Is the DTC P0603 or P062F detected again?

YES>>

Replace ECM. Refer to Removal and Installation.

NO>>

INSPECTION END

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