Lan System (CAN): Diagnosis Nissan Juke I facelift

Precautions for Trouble Diagnosis

Scheme 17

Scheme 18

1. Solder the repaired area and wrap tape around the soldered area. NOTE: A fray of twisted lines must be within 110 mm (4.33 in).
2. Bypass connection is never allowed at the repaired area. NOTE: Bypass connection may cause CAN communication error. The spliced wire becomes separated and the characteristics of twisted line are lost.
3. Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communication line.

Scheme 19

Scheme 20

Scheme 21

1. CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
2. Termination circuits (resistors) are connected across the CAN communication system. When transmitting a CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to the CAN-L line. The current flows separately into the termination circuits connected across the CAN communication system and the termination circuits drop voltage to generate a potential difference between the CAN-H line and the CAN-L line. The system produces digital signals for signal communications, by using the potential difference.

Diagnosis Procedure

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side). Harness connector E105 Harness connector M77 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the following harness connectors. IPDM E/R Harness connectors E105 and M77 Check the continuity between the IPDM E/R harness connector and the harness connector. IPDM E/R harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. E13 27 E105 1 Existed 26 6 Existed Is the inspection result normal? YES: GO TO 3. NO: Repair the main line between the IPDM E/R and the harness connector E105.
3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Check the continuity between the harness connector and the data link connector. Harness connector Data link connector Continuity Connector No. Terminal No. Connector No. Terminal No. M77 1 M4 6 Existed 6 14 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the IPDM E/R and the data link connector. NO: Repair the main line between the harness connector M77 and the data link connector.

1. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect the BCM harness connector. Check the continuity between the data link connector and the BCM harness connector. With Intelligent Key system Data link connector BCM harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. M4 6 M68 39 Existed 14 40 Existed Without Intelligent Key system Data link connector BCM harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. M4 6 M65 39 Existed 14 40 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the data link connector and the air bag diagnosis sensor unit. NO: Repair the main line between the data link connector and the air bag diagnosis sensor unit.

1. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect the following harness connectors. ECM Multi display unit Check the continuity between the data link connector and the multi display unit harness connector. Data link connector Multi display unit harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. M4 6 M90 6 Existed 14 12 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the data link connector and the multi display unit. NO: Repair the main line between the data link connector and the multi display unit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the ECM for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of ECM. Check the resistance between the ECM harness connector terminals. ECM harness connector Resistance (ohms) Connector No. Terminal No. E18 100 99 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the ECM branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the ECM. Refer to " «DIAGNOSIS PROCEDURE»(ref-621379-S02402266352014061000000) ". Is the inspection result normal? YES (Present error): Replace the ECM. Refer to " «REMOVAL AND INSTALLATION»(ref-621379-S14849212992014061000000) ". YES (Past error): Error was detected in the ECM branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side). AWD control module Harness connector B7 Harness connector E107 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of AWD control module. Check the resistance between the AWD control module harness connector terminals. AWD control module harness connector Resistance (ohms) Connector No. Terminal No. B47 4 5 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the AWD control module branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the AWD control module. Refer to " «DIAGNOSIS PROCEDURE»(ref-621388-S26788654022014061000000) ". Is the inspection result normal? YES (Present error): Replace the AWD control module. Refer to " «REMOVAL AND INSTALLATION»(ref-621388-S37767170322014061000000) ". YES (Past error): Error was detected in the AWD control module branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the ABS actuator and electric unit (control unit) for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of ABS actuator and electric unit (control unit). Check the resistance between the ABS actuator and electric unit (control unit) harness connector terminals. ABS actuator and electric unit (control unit) harness connector Resistance (ohms) Connector No. Terminal No. E35 22 9 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the ABS actuator and electric unit (control unit) branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the ABS actuator and electric unit (control unit). Refer to " «DIAGNOSIS PROCEDURE»(ref-621404-S33447614662014061000000) ". Is the inspection result normal? YES (Present error): Replace the ABS actuator and electric unit (control unit). Refer to " «REMOVAL AND INSTALLATION»(ref-621404-S14992033342014061000000) ". YES (Past error): Error was detected in the ABS actuator and electric unit (control unit) branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the IPDM E/R for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of IPDM E/R. Check the resistance between the IPDM E/R harness connector terminals. IPDM E/R harness connector Resistance (ohms) Connector No. Terminal No. E13 27 26 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the IPDM E/R branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the IPDM E/R. Refer to the following. Models with Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-621402-S37380175882014061000000) " Models without Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-621406-S08607612842014061000000) " Is the inspection result normal? YES (Present error): Replace the IPDM E/R. Refer to the following. Models with Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-621402-S03163705952014061000000) " Models without Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-621406-S30508760132014061000000) " YES (Past error): Error was detected in the IPDM E/R branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side). TCM Harness connector F1 Harness connector E8 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of TCM. Check the resistance between the TCM harness connector terminals. TCM harness connector Resistance (ohms) Connector No. Terminal No. F81 32 31 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the TCM branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the TCM. Refer to " «DIAGNOSIS PROCEDURE»(ref-621391-S13298122342014061000000) ". Is the inspection result normal? YES (Present error): Replace the TCM. Refer to " «REMOVAL AND INSTALLATION»(ref-621391-S22539618542014061000000) ". YES (Past error): Error was detected in the TCM branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the data link connector for damage, bend and loose connection (connector side and harness side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Check the resistance between the data link connector terminals. Data link connector Resistance (ohms) Connector No. Terminal No. M4 6 14 Approx. 54 - 66 Is the measurement value within the specification? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the data link connector branch line circuit. NO: Repair the data link connector branch line.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the EPS control unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of EPS control unit. Check the resistance between the EPS control unit harness connector terminals. EPS control unit harness connector Resistance (ohms) Connector No. Terminal No. M37 2 1 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the EPS control unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the EPS control unit. Refer to " «DIAGNOSIS PROCEDURE»(ref-621418-S40435892772014061000000) ". Is the inspection result normal? YES (Present error): Replace the EPS control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-621405-S00720704992014061000000) ". YES (Past error): Error was detected in the EPS control unit branch line. NO: Repair the power supply and the ground circuit.

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). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of combination meter. Check the resistance between the combination meter harness connector terminals. Combination meter harness connector Resistance (ohms) Connector No. Terminal No. M34 1 2 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the combination meter branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the combination meter. Refer to " «COMBINATION METER: DIAGNOSIS PROCEDURE»(ref-621397-S20162760632014061000000) ". Is the inspection result normal? YES (Present error): Replace the combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-621397-S28484500802014061000000) ". YES (Past error): Error was detected in the combination meter branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of steering angle sensor. Check the resistance between the steering angle sensor harness connector terminals. Steering angle sensor harness connector Resistance (ohms) Connector No. Terminal No. M30 5 2 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the steering angle sensor branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the steering angle sensor. Refer to " «WIRING DIAGRAM»(ref-621404-S21006418052014061000000) ". Is the inspection result normal? YES (Present error): Replace the steering angle sensor. Refer to " «REMOVAL AND INSTALLATION»(ref-621404-S10781751472014061000000) ". YES (Past error): Error was detected in the steering angle sensor branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the air bag diagnosis sensor unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Replace the main harness.
2. CHECK AIR BAG DIAGNOSIS SENSOR UNIT Check the air bag diagnosis sensor unit. Refer to " «DIAGNOSIS AND REPAIR WORK FLOW»(ref-621372-S10959402122014061000000) ". Is the inspection result normal? YES: Replace the main harness. NO: Replace parts whose air bag system has a malfunction.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the A/C auto amp. for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of A/C auto amp. Check the resistance between the A/C auto amp. harness connector terminals. A/C auto amp. harness connector Resistance (ohms) Connector No. Terminal No. M50 6 7 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the A/C auto amp. branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the A/C auto amp. Refer to " «A/C AUTO AMP.: DIAGNOSIS PROCEDURE»(ref-621375-S32822330972014061000000) ". Is the inspection result normal? YES (Present error): Replace the A/C auto amp. Refer to " «REMOVAL AND INSTALLATION»(ref-621375-S18972163282014061000000) ". YES (Past error): Error was detected in the A/C auto amp. branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the multi display unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of multi display unit. Check the resistance between the multi display unit harness connector terminals. Multi display unit harness connector Resistance (ohms) Connector No. Terminal No. M90 6 12 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the multi display unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the multi display unit. Refer to " «MULTI DISPLAY UNIT: DIAGNOSIS PROCEDURE»(ref-621427-S07119358662014061000000) ". Is the inspection result normal? YES (Present error): Replace the multi display unit. Refer to " «REMOVAL AND INSTALLATION»(ref-621440-S28827758082014061000000) ". YES (Past error): Error was detected in the multi display unit branch line. NO: Repair the power supply and the ground circuit.

1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of BCM. Check the resistance between the BCM harness connector terminals. Models with Intelligent Key system BCM harness connector Resistance (ohms) Connector No. Terminal No. M68 39 40 Approx. 108 - 132 Models without Intelligent Key system BCM harness connector Resistance (ohms) Connector No. Terminal No. M65 39 40 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the BCM branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the BCM. Refer to the following. Models with Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-621407-S33470592292014061000000) " Models without Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-621424-S01264780112014061000000) " Is the inspection result normal? YES (Present error): Replace the BCM. Refer to the following. Models with Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-621407-S12173041482014061000000) " Models without Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-621424-S00723926222014061000000) " YES (Past error): Error was detected in the BCM branch line. NO: Repair the power supply and the ground circuit.

1. CONNECTOR INSPECTION Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect all the unit connectors on CAN communication system. Check terminals and connectors for damage, bend and loose connection. Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector terminals. Data link connector Continuity Connector No. Terminal No. M4 6 14 Not existed Is the inspection result normal? YES: GO TO 3. NO: Check the harness and repair the root cause.
3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector and the ground. Data link connector Ground Continuity Connector No. Terminal No. M4 6 Not existed 14 Not existed Is the inspection result normal? YES: GO TO 4. NO: Check the harness and repair the root cause.
4. CHECK ECM AND BCM TERMINATION CIRCUIT Remove the ECM and the BCM. Check the resistance between the ECM terminals. ECM Resistance (ohms) Terminal No. 100 99 Approx. 108 - 132 Check the resistance between the BCM terminals. BCM Resistance (ohms) Terminal No. 39 40 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 5. NO: Replace the ECM and/or the BCM.
5. CHECK SYMPTOM Connect all the connectors. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced. Inspection result Reproduced: GO TO 6. Non-reproduced: Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.
6. CHECK UNIT REPRODUCTION Perform the reproduction test as per the following procedure for each unit. Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect one of the unit connectors of CAN communication system. NOTE: ECM and BCM have a termination circuit. Check other units first. Connect the battery cable to the negative terminal. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced. NOTE: Although unit-related error symptoms occur, do not confuse them with other symptoms. Inspection result Reproduced: Connect the connector. Check other units as per the above procedure. Non-reproduced: Replace the unit whose connector was disconnected.