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Lan System: Diagnosis Nissan Frontier D40

Communication Devices 7 illustrations ~3282 words

Precautions for Trouble Diagnosis

CAUTIONNever apply 7.0 V or more to the measurement terminal. Use a tester with open terminal voltage of 7.0 V or less. Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.

Scheme 87

Scheme 87: Precautions for Harness Repair
Scheme 87: Precautions for Harness Repair

Scheme 88

Scheme 88
Scheme 88
  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). (Scheme 87): Identifying Soldered And Taped Area OK Position
  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. (Scheme 88): Identifying Bypass Connection
  3. Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communication line.

Symptom When Error Occurs in CAN Communication System

In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units related to the root cause malfunction or go into fail-safe mode.

CAN Diagnostic Support Monitor

CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root cause.

MONITOR ITEM (ON-BOARD DIAGNOSIS)

Note. For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-II is not available.)

Example: Vehicle Display

ItemResult indicatedError counterDescription
CAN_COMM (Initial diagnosis)OK0Normal at present
NG1 - 50Control unit error (The number indicates how many times diagnosis has been run.)
CAN_CIRC_1 (Transmission diagnosis)OK0Normal at present
UNKWN1 - 50Unable to transmit for 2 seconds or more at present. (The number indicates how many times diagnosis has been run.)
CAN_CIRC_2-9 (Reception diagnosis of each unit)OK0Normal at present
UNKWN1 - 50Unable to transmit for 2 seconds or more at present. (The number indicates how many times diagnosis has been run.)
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional parts)

MONITOR ITEM (ON-BOARD DIAGNOSIS)

Information Needed for Trouble Diagnosis

CAN communication system performs trouble diagnosis with the following tools.

ToolUsage
Interview sheetFor filling in vehicle information and interview with customer.
Data sheetFor attaching CONSULT-II data or on-board diagnosis data.
Diagnosis sheetFor detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system type)
SELECT SYSTEM (CONSULT-II)For checking the condition of control units and the status of CAN communication.
SELF-DIAG RESULTS (CONSULT-II)
CAN DIAG SUPPORT MNTR (CONSULT-II)
CAN communication signal chartFor converting information received from a customer into CAN communication signal transmission and reception. This information can be used to judge whether a circuit between control units is normal or abnormal.
Abbreviation listFor checking abbreviations in CAN communication signal chart and diagnosis sheet.

TROUBLE DIAGNOSES WORK FLOW

INSPECTION OF VEHICLE CONDITION

  1. Check whether or not "U1000" or "U1001" is indicated on "SELF-DIAG RESULTS" by CONSULT-II. NOTE: Root cause cannot be detected using the procedure in this section if "U1000" or "U1001" is not indicated.
  2. Check whether the symptom is reproduced or not. NOTE: Never turn the ignition switch OFF or disconnect the battery cable while the reproducing the error. The error may temporarily correct itself, making it difficult to determine the root cause. The procedures for present errors differ from the procedures for past errors. Refer to , " «DETECT THE ROOT CAUSE»(ref-277060-S35690647802008011500000) ".

Create On-board Diagnosis Copy Sheet

Display the trouble diagnosis result of CAN communication with the on-board diagnosis function on the vehicle monitor, etc. Copy them on the on-board diagnosis copy sheet.

Note. For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-II is not available.)

Display - On-Board Diagnosis Copy Sheet. Scheme 89

Scheme 89: Display - On-Board Diagnosis Copy Sheet
Scheme 89: Display - On-Board Diagnosis Copy Sheet

CREATE DIAGNOSIS SHEET

Note. Be sure to use the diagnosis sheet for the correct CAN system type.

Print Diagnosis Sheet

Print the diagnosis sheet for the applicable CAN system type.

Inspection procedure

  1. Refer to , " «MALFUNCTION AREA CHART»(ref-277060-S31014571732008011500000) ".

Present Error - Short Circuit Diagram. Scheme 90

Scheme 90: Present Error - Short Circuit Diagram
Scheme 90: Present Error - Short Circuit Diagram

DTC No. Index

DTCSelf-diagnosis item (CONSULT-II indication)DTC detection conditionInspection
U1000CAN COMM CIRCUITWhen ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) for 2 seconds or more.Refer to , " HOW TO USE THIS INFORMATION ".
When a control unit (except for ECM) is not transmitting or receiving CAN communication signal for 2 seconds or more.
U1001CAN COMM CIRCUITWhen ECM is not transmitting or receiving CAN communication signal other than OBD (emission-related diagnosis) for 2 seconds or more.
U1002SYSTEM COMMWhen a control unit is not transmitting or receiving CAN communication signal for 2 seconds or less.Start the inspection. Refer to the applicable information of the indicated control unit.
U1010CONTROL UNIT [CAN]When an error is detected during the initial diagnosis for CAN controller of each control unit.Replace the control unit indicating "U1010".

INDEX FOR DTC

CAUTIONNever apply 7.0 V or more to the measurement terminal. Use a tester with open terminal voltage of 7.0 V or less. Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.

Scheme 91

Scheme 91: Precautions for Harness Repair
Scheme 91: Precautions for Harness Repair

Scheme 92

Scheme 92
Scheme 92
  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). (Scheme 91): Identifying Soldered And Taped Area OK Position
  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. (Scheme 92): Identifying Bypass Connection
  3. Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communication line.

Use "CAN DIAG SUPPORT MNTR" for detecting the root cause.

  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 F14 Harness connector E5 Harness connector E152 Harness connector M31 OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the following harness connectors. A/T assembly connector Harness connector F14 and E5 Check the continuity between the A/T assembly harness connector and the harness connector. CONTINUITY SPECIFICATIONS (OPEN CIRCUIT) A/T assembly harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. F9 3 F14 2 Yes 8 3 Yes OK or NG OK: GO TO 3 . NG: Repair the main line between the A/T assembly and the harness connector F14.
  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the harness connectors E152 and M31. Check the continuity between harness connectors. HARNESS CONTINUITY (OPEN CIRCUIT) Harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. E5 2 E152 52G Yes 3 51G Yes OK or NG OK: GO TO 4 . NG: Repair the main line between the harness connector E5 and the harness connector E152.
  4. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Check the continuity between the harness connector and the data link connector. CONTINUITY SPECIFICATIONS (OPEN CIRCUIT) Harness connector Data link connector Continuity Connector No. Terminal No. Connector No. Terminal No. M31 52G M22 6 Yes 51G 14 Yes OK or NG OK: Present error: Check the following items again. Decision of CAN system type. Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR). Procedure for detecting root cause. Past error: Error was detected in the main line between the A/T assembly and the data link connector. NG: Repair the main line between the harness connector M31 and the data link connector.
  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 M91 Harness connector E26 OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the harness connectors M91 and E26. Check the continuity between the data link connector and the harness connector. HARNESS CONTINUITY (OPEN CIRCUIT) Data link connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. M22 6 M91 11 Yes 14 10 Yes OK or NG OK: GO TO 3 . NG: Repair the main line between the data link connector and the harness connector M91.
  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the connector of ABS actuator and electric unit (control unit). Check the continuity between the harness connector and the ABS actuator and electric unit (control unit) harness connector. CONTINUITY SPECIFICATIONS (OPEN CIRCUIT) Harness connector ABS actuator and electric unit (control unit) harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. E26 11 E125 11 Yes 10 15 Yes OK or NG OK: Present error: Check the following items again. Decision of CAN system type. Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR). Procedure for detecting root cause. Past error: Error was detected in the main line between the data link connector and the ABS actuator and electric unit (control unit). NG: Repair the main line between the harness connector E26 and the ABS actuator and electric unit (control unit).
  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). M/T models ECM connector Harness connector E152 Harness connector M31 A/T models ECM connector Harness connector E2 Harness connector F32 OK or NG OK: GO TO 2 . NG: 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. HARNESS FOR OPEN CIRCUIT ECM harness connector Resistance (ohms) Connector No. Terminal No. E16 94 86 Approx. 108 - 132 OK or NG OK: GO TO 3 . NG: 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 «POWER SUPPLY AND GROUND CIRCUIT»(ref-272338-S05816903792007111800000) (QR engine) or «POWER SUPPLY AND GROUND CIRCUIT»(ref-272339-S34882500552007111800000) (VQ engine). OK or NG OK: Present error: Replace the ECM. Refer to «PROCEDURE AFTER REPLACING ECM»(ref-272338-S40359911222007111800000) (QR engine) or «PROCEDURE AFTER REPLACING ECM»(ref-272339-S40489531912007111800000) (VQ engine). Past error: Error was detected in the ECM branch line. NG: 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 A/T assembly for damage, bend and loose connection (unit side and connector side). OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of A/T assembly. Check the resistance between the A/T assembly harness connector terminals. HARNESS FOR OPEN CIRCUIT A/T assembly harness connector Resistance (ohms) Connector No. Terminal No. F9 3 8 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: 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 «MAIN POWER SUPPLY AND GROUND CIRCUIT»(ref-272346-S03592539872007111800000) . OK or NG OK: Present error: Replace the control valve with the TCM. Refer to «CONTROL VALVE WITH TCM REMOVAL AND INSTALLATION»(ref-272346-S40602636812007111800000) . Past error: Error was detected in the TCM branch line. NG: 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 transfer control unit for damage, bend and loose connection (unit side and connector side). OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of transfer control unit. Check the resistance between the transfer control unit harness connector terminals. HARNESS FOR OPEN CIRCUIT Transfer control unit harness connector Resistance (ohms) Connector No. Terminal No. M152 1 2 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: Repair the transfer control unit branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the transfer control unit. Refer to «POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT»(ref-272365-S09519164472007111800000) . OK or NG OK: Present error: Replace the transfer control unit. Refer to «REMOVAL AND INSTALLATION»(ref-272365-S11035519962007111800000) . Past error: Error was detected in the transfer control unit branch line. NG: 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). OK or NG OK: GO TO 2 . NG: 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. HARNESS FOR OPEN CIRCUIT BCM harness connector Resistance (ohms) Connector No. Terminal No. M18 39 40 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: 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 «BCM POWER SUPPLY AND GROUND CIRCUIT CHECK»(ref-272372-S41757468832007111800000) . OK or NG OK: Present error: Replace the BCM. Refer to «REMOVAL AND INSTALLATION»(ref-272372-S08280128112007111800000) . Past error: Error was detected in the BCM branch line. NG: 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 differential lock control unit for damage, bend and loose connection (unit side and connector side). OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of differential lock control unit. Check the resistance between the differential lock control unit harness connector terminals. HARNESS FOR OPEN CIRCUIT Differential lock control unit harness connector Resistance (ohms) Connector No. Terminal No. M70 5 4 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: Repair the differential lock control unit branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the differential lock control unit. Refer to «POWER SUPPLY CIRCUIT FOR DIFFERENTIAL LOCK CONTROL UNIT»(ref-272368-S35248283462007111800000) . OK or NG OK: Present error: Replace the differential lock control unit. Refer to «REMOVAL AND INSTALLATION»(ref-272368-S42235719562007111800000) . Past error: Error was detected in the differential lock control unit branch line. NG: 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). OK or NG OK: GO TO 2 . NG: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Check the resistance between the data link connector terminals. HARNESS FOR OPEN CIRCUIT Data link connector Resistance (ohms) Connector No. Terminal No. M22 6 14 Approx. 54 - 66 OK or NG OK: Present error: Check the following items again. Decision of CAN system type. Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR). Procedure for detecting root cause. Past error: Error was detected in the data link connector branch line circuit. NG: 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 combination meter for damage, bend and loose connection (unit side and connector side). OK or NG OK: GO TO 2 . NG: 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. HARNESS FOR OPEN CIRCUIT Combination meter harness connector Resistance (ohms) Connector No. Terminal No. M24 12 11 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: 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 «POWER SUPPLY AND GROUND CIRCUIT INSPECTION»(ref-272357-S06239046642007111800000) . OK or NG OK: Present error: Replace the combination meter. Refer to «REMOVAL AND INSTALLATION»(ref-272357-S01965386622007111800000) . Past error: Error was detected in the combination meter branch line. NG: 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). OK or NG OK: GO TO 2 . NG: 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. HARNESS FOR OPEN CIRCUIT Steering angle sensor harness connector Resistance (ohms) Connector No. Terminal No. M47 4 5 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: 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 «SCHEMATIC»(ref-272358-S20016366862007111800000) . OK or NG OK: Present error: Replace the steering angle sensor. Refer to «REMOVAL AND INSTALLATION»(ref-272358-S39739852162007111800000) . Past error: Error was detected in the steering angle sensor branch line.
  4. NG: 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). OK or NG OK: GO TO 2 . NG: 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 TERMINALS ABS actuator and electric unit (control unit) harness connector Resistance (ohms) Connector No. Terminal No. E125 11 15 Approx. 54 - 66 OK or NG OK: GO TO 3 . NG: 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 the following. Models with ABS: «SCHEMATIC»(ref-272358-S42145480152007111800000) Models with ABLS: «SCHEMATIC»(ref-272358-S33203264792007111800000) Models with VDC: «SCHEMATIC»(ref-272358-S20016366862007111800000) OK or NG OK: Present error: Replace the ABS actuator and electric unit (control unit). Refer to the following. Models with ABS: «REMOVAL AND INSTALLATION»(ref-272358-S17087914142007111800000) Models with ABLS: «REMOVAL AND INSTALLATION»(ref-272358-S19299186182007111800000) Models with VDC: «REMOVAL AND INSTALLATION»(ref-272358-S06665087022007111800000) Past error: Error was detected in the ABS actuator and electric unit (control unit) branch line. NG: 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). OK or NG OK: GO TO 2 . NG: 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. RESISTANCE SPECIFICATIONS IPDM E/R harness connector Resistance (ohms) Connector No. Terminal No. E122 39 40 Approx. 108 - 132 OK or NG OK: GO TO 3 . NG: 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 «IPDM E/R POWER/GROUND CIRCUIT INSPECTION»(ref-272337-S27691215102007111800000) . OK or NG OK: Present error: Replace the IPDM E/R. Refer to «REMOVAL AND INSTALLATION OF IPDM E/R»(ref-272337-S22727732142007111800000) Past error: Error was detected in the IPDM E/R branch line. NG: Repair the power supply and the ground circuit.

CAN System Diagnosis Sheet (Type 15). Scheme 93

  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. OK or NG OK: GO TO 2. NG: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector terminals. DATA LINK CONNECTOR TERMINALS Data link connector Continuity Connector No. Terminal No. M22 6 14 No OK or NG OK: GO TO 3. NG: 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 AND THE GROUND Data link connector Ground Continuity Connector No. Terminal No. M22 6 No 14 No OK or NG OK: GO TO 4. NG: Check the harness and repair the root cause.
  4. CHECK ECM AND IPDM E/R TERMINATION CIRCUIT Remove the ECM and the IPDM E/R. Check the resistance between the ECM terminals. ECM AND IPDM E/R TERMINATION CIRCUIT (1 OF 2) ECM Resistance (ohms) Terminal No. 94 86 Approx. 108 - 132 Check the resistance between the IPDM E/R terminals. see scheme 72: Checking ECM And IPDM E/R Resistance ECM AND IPDM E/R TERMINATION CIRCUIT (2 OF 2) IPDM E/R Resistance (ohms) Terminal No. 39 40 Approx. 108 - 132 OK or NG OK: GO TO 5. NG: Replace the ECM and/or the IPDM E/R.
  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 all the unit connectors on CAN communication system. NOTE: ECM and IPDM E/R 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.

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