Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

  • U1000 CAN comm circuit
  • Description DTC Logic DTC DETECTION LOGIC NOTE: U1000 can be set if a module harness was disconnected and reconnected, perhaps during a repair. Confirm that there are actual CAN diagnostic symptoms and a present DTC by performing the Self Diagnostic Result procedure. Diagnosis Procedure 1. PERFORM SELF DIAGNOSTIC Turn ignition switch ON and wait for 2 seconds or more. Check "SELF- DIAG RESULTS".

  • U1010 control unit (CAN)
  • DTC Logic DTC DETECTION LOGIC Diagnosis Procedure 1. REPLACE BCM When DTC U1010 is detected, replace BCM.

  • B2553 ignition relay
  • Description BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned ON. Ignition relay-1 (inside IPDM E/R) Ignition relay-2 (inside fuse block (J/B)) Front blower motor relay BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON under the following conditions, and wait for at least 2 seconds. CVT selector lever is in the P or N position. Release brake pedal. Check "Self diagnostic result" with CONSULT. Diagnosis Procedure 1.

  • B260A ignition relay
  • Description BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned ON. Ignition relay-1 (inside IPDM E/R) Ignition relay-2 (inside fuse block (J/B)) Front blower motor relay BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status. DTC Logic DTC DETECTION LOGIC NOTE: If DTC B260A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to PCS-44, "DTC Logic". If DTC B260A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to PCS-45, "DTC Logic".

  • B2614 ACC relay circuit
  • Description BCM controls the various electrical components and simultaneously supplies power according to the power supply position. BCM checks the power supply position internally. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn the power supply position to ACC under the following conditions, and wait for at least 1 second. CVT selector lever is in the P or N position. Release the brake pedal. Check "Self diagnostic result" with CONSULT. Diagnosis Procedure 1. CHECK ACCESSORY RELAY-1 POWER SUPPLY Turn ignition switch OFF. Disconnect accessory relay-1.

  • B2615 front blower motor relay circuit
  • Description BCM controls the various electrical components and simultaneously supplies power according to the power supply position. BCM checks the power supply position internally. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON under the following conditions, and wait for at least 1 second. CVT selector lever is in the P or N position. Release brake pedal. Check "Self diagnostic result" with CONSULT. Diagnosis Procedure 1.CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY Turn ignition switch OFF. Disconnect front blower motor relay.

  • B2616 ignition relay circuit
  • Description BCM controls the various electrical components and simultaneously supplies power according to the power supply position. BCM checks the power supply position internally. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON under the following conditions, and wait for at least 1 second. CVT selector lever is in the P or N position Release brake pedal Check "Self diagnostic result" with CONSULT. Diagnosis Procedure 1. CHECK IGNITION RELAY-2 POWER SUPPLY Turn ignition switch OFF. Disconnect ignition relay-2. Check voltage between ignition relay-2 harness connector and ground under the following conditions. 2.

  • B2618 BCM
  • Description BCM controls the various electrical components and simultaneously supplies power according to the power supply position. BCM checks the power supply position internally. DTC Logic DTC DETECTION LOGIC NOTE: If DTC B2618 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to PCS-44, "DTC Logic". If DTC B2618 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to PCS-45, "DTC Logic". DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON under the following conditions, and wait for at least 1 second.

  • B261A push-button ignition switch
  • Description IPDM E/R transmits the push-button ignition switch status via CAN communication to BCM. BCM receives push-button ignition switch status by hardwire input. BCM compares the 2 signals for mismatch. DTC Logic DTC DETECTION LOGIC NOTE: If DTC B261A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to PCS-44, "DTC Logic". If DTC B261A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to PCS-45, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.PERFORM DTC CONFIRMATION PROCEDURE Press the push-button ignition switch under the following conditions and wait for at least 1 second.

Diagnosis system (BCM)

U1000 CAN comm circuit