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Error Example

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
  • Refer to "ABBREVIATION LIST " for the unit abbreviation.

Example: TCM branch line open circuit 

Fig 1: Identifying CAN Communication System Error Example - TCM Branch Line Open Circuit
G04879054Courtesy of NISSAN NORTH AMERICA, INC.
UNIT NAME AND SYMPTOM CHART

Unit name Symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM Reverse warning chime does not sound.
EPS control unit Normal operation.
Combination meter
  • Shift position indicator and OD OFF indicator turn OFF.
  • Warning lamps turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R Normal operation.

Example: Data link connector branch line open circuit 

Fig 2: Identifying CAN Communication System Error Example - Data Link Connector Branch Line Open Circuit
G04879055Courtesy of NISSAN NORTH AMERICA, INC.
UNIT NAME AND SYMPTOM CHART

Unit name Symptom
ECM Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
NOTE:
  • When data link connector branch line is open, transmission and reception of CAN communication signals is not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
  • When data link connector branch line is open, the screen-display of the CONSULT-II "SELECT SYSTEM" screen may be the same as when the CAN communication line has short-circuit. However, symptoms differ depending on the case. See below chart for the differences.
SYMPTOM DIFFERENCE

  SELECT SYSTEM (CONSULT-II) Difference of symptom
Data link connector branch line open circuit All Diag on CAN units are not indicated. Normal operation.
CAN-H, CAN-L harness short-circuit Most the units which are connected to the CAN communication system enter fail-safe mode or are deactivated.

Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit 

Fig 3: Identifying CAN Communication System Error Example - Main Line Between DLC And ABS Actuator
G04879056Courtesy of NISSAN NORTH AMERICA, INC.
UNIT NAME AND SYMPTOM CHART

Unit name Symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM
  • Reverse warning chime does not sound.
  • The front wiper moves under continuous operation mode even though the front wiper switch being in the intermittent position.
EPS control unit The steering effort increases.
Combination meter
  • The shift position indicator and OD OFF indicator turn OFF.
  • The speedometer is inoperative.
  • The odo/trip meter stops.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R When the ignition switch is ON,
  • The headlamps (Lo) turn ON.
  • The cooling fan continues to rotate.

Example: CAN-H, CAN-L Harness Short Circuit 

Fig 4: Identifying CAN Communication System Error Example - CAN-H, CAN-L Harness Short Circuit
G04879057Courtesy of NISSAN NORTH AMERICA, INC.
UNIT NAME AND SYMPTOM CHART

Unit name Symptom
ECM
  • Engine torque limiting is affected, and shift harshness increases.
  • Engine speed drops.
BCM
  • Reverse warning chime does not sound.
  • The front wiper moves under continuous operation mode even though the front wiper switch being in the intermittent position.
  • The room lamp does not turn ON.
  • The engine does not start (if an error or malfunction occurs while turning the ignition switch is OFF.)
  • The steering lock does not release (if an error or malfunction occurs while turning the ignition switch is OFF.)
EPS control unit The steering effort increases.
Combination meter
  • The tachometer and the speedometer do not move.
  • Warning lamps turn ON.
  • Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R When the ignition switch is ON,
  • The headlamps (Lo) turn ON.
  • The cooling fan continues to rotate.
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