Data Communication/lan System: Other Suzuki Equator I

Caution

1. This section describes information peculiar to a vehicle, sheets for trouble diagnosis, and inspection procedures.
2. For trouble diagnosis procedure, refer to [ «LAN SYSTEM: BASIC INSPECTION»(ref-375702-S30621783612010102800000) ].

LAN System: Condition of Error Detection

"U1000" or "U1001" is indicated on DTC check on SDT if CAN communication signal is not transmitted or received between units for 2 seconds or more.

CAN COMMUNICATION SYSTEM ERROR

1. CAN communication line open (CAN-H, CAN-L, or both)
2. CAN communication line short (ground, between CAN communication lines, other harnesses)
3. Error of CAN communication control circuit of the unit connected to CAN communication line

WHEN "U1000" OR "U1001" IS INDICATED EVEN THOUGH CAN COMMUNICATION SYSTEM IS NORMAL

1. Removal/installation of parts: Error may be detected when removing and installing CAN communication unit and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be detected.)
2. Fuse blown out (removed): CAN communication of the unit may cease.
3. Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition switch ON (Depending on the control unit which carries out CAN communication).
4. Error may be detected if the power supply circuit of the control unit, which carries out CAN communication, malfunctions (Depending on the control unit which carries out CAN communication).
5. Error may be detected if reprogramming is not completed normally. NOTE: CAN communication system is normal if "U1000" or "U1001" is indicated on DTC check of SDT under the above conditions. Erase the memory of each unit.

ERROR EXAMPLE

Note. Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring. Refer to [ HOW TO USE THIS SECTION ]for the unit abbreviation.

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SYMPTOM CHART

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SYMPTOM CHART

Note. When data link connector branch line is open, transmission and reception of CAN communication signals are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit. When data link connector branch line is open, "ECU list" displayed on the SDT "Bus check" 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 CHART "ECU list" on the "Bus check" (SDT) 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 of the units which are connected to the CAN communication system enter fail-safe mode or are deactivated.

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SYMPTOM CHART

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SYMPTOM CHART

LAN System: Bus Check

SDT and bus check (on-board diagnosis function) are used for detecting root cause.

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Without PAST

ITEM DESCRIPTION

With PAST

ITEM DESCRIPTION

How to Use CAN Communication Signal Chart

The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.

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INTERVIEW WITH CUSTOMER

Interview with the customer is important to detect the root cause of CAN communication system errors and to understand vehicle condition and symptoms for proper trouble diagnosis.

Points in interview

1. What: Parts name, system name
2. When: Date, Frequency
3. Where: Road condition, Place
4. In what condition: Driving condition/environment
5. Result: Symptom

Note. Check normal units as well as error symptoms. Example: Circuit between ECM and the combination meter is judged normal if the customer indicates tachometer functions normally. When a CAN communication system error is present, multiple control units may malfunction or go into fail-safe mode. Indication of the combination meter is important to detect the root cause because it is the most obvious to the customer, and it performs CAN communication with many units.

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CREATE INTERVIEW SHEET

Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview sheet.

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Collect SDT Data

Print out or save the following SDT data.

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1. DTC check
2. Bus check ("ECU list" included) NOTE: Some items may not be needed depending on CAN system type of vehicle.

Check Collected Data

Make sure that all ECUs are received, referring to "ECU list".

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1. For abbreviations, refer to [ «HOW TO USE THIS SECTION»(ref-375702-S13079054472010102800000) ].

DETECT THE ROOT CAUSE

Identify the root cause using the created diagnosis sheet.

Identifying the root cause

1. Draw a line on the diagnosis sheet to indicate the possible cause. Narrow the search. NOTE: Color-code when drawing lines. Do not draw a line onto a existing line.
2. Drawing a line is not necessary if the circuit is shorted. Refer to " «PRESENT ERROR - SHORT CIRCUIT»(ref-375702-S28281753552010102800000) ", "Past Error - Short Circuit -". Refer to the following for details of the trouble diagnosis procedure.
3. "Present Error - Open Circuit -"
4. " «PRESENT ERROR - SHORT CIRCUIT»(ref-375702-S28281753552010102800000) "
5. "Past Error - Open Circuit -"
6. "Past Error - Short Circuit -" NOTE: When the root cause appears to be a branch line or short circuit, be sure to check the control unit as well as the communication line.

Present Error - Open Circuit

Identify the error circuit using information from the "Bus check" ("ECU list" included).

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1. ECU list: Check the items indicated in "ECU list". Draw a line on the diagnosis sheet to indicate the error circuit. NOTE: CAN communication line has no error if units other than Diag on CAN units are not indicated. An error may be on the power supply of the control unit, DDL1 line or DDL2 line. "TCM" which is Diag on CAN unit, is not indicated on "ECU list". This indicates that DLC is not receiving a signal from TCM. Draw a line to indicate an error between DLC and TCM (line 1-a in the figure below). NOTE: Diag on CAN units are not indicated on the "ECU list" when the CAN line between Diag on CAN unit and the data link connector is open. For a description of Diag on CAN, refer to [ «DIAG ON CAN: DESCRIPTION»(ref-375702-S18906213102010102800000) ].
2. Bus check: Check each item on "Bus check". Draw a line on the diagnosis sheet to indicate the error circuit. Reception item of "ECM": On "TCM", "UNKWN" is indicated. This means ECM cannot receive the signal from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure below). NOTE: If "UNKWN" is indicated on "TRANSMIT DIAG", then the control unit cannot transmit CAN communication signal to each unit. Draw a line between the control unit and the splice. Reception item of "AFS": On "TCM", "UNKWN" is indicated. This means AFS cannot receive the signal from TCM. Draw a line to indicate an error between AFS and TCM (line 2-b in the figure below). Reception item of "AV": "UNKWN" is not indicated. This indicates normal communication between AV and its receiving units. Do not draw any line. Reception item of "BCM": On "TCM", "UNKWN" is indicated. This means BCM cannot receive the signal from TCM. Draw a line to indicate an error between BCM and TCM (line 2-d in the figure below). Reception item of "EPS" and "I-KEY": "UNKWN" is not indicated. This indicates normal communication between EPS and I-KEY and their receiving units. Do not draw any line. NOTE: On bus check (without PAST), "UNKWN" is indicated even though the item is not used in the trouble diagnosis. For the details of each item on bus check, refer to [ «BUS CHECK»(ref-375702-S22163526062010102800000) ]. Reception item of "M&A": On "TCM", "UNKWN" is indicated. This means M&A cannot receive the signal from TCM. Draw a line to indicate an error between M&A and TCM (line 2-f in the figure below). Reception item of "ADP": On "TCM", "UNKWN" is indicated. This means ADP cannot receive the signal from TCM. Draw a line to indicate an error between ADP and TCM (line 2-g in the figure below). Reception item of "ABS": "UNKWN" is not indicated. This indicates normal communication between ABS and its receiving units. Do not draw any line. Reception item of "IPDM-E": "UNKWN" is not indicated. This indicates normal communication between IPDM-E and its receiving units. Do not draw any line.
3. Based on information received from "Bus check", place a check mark on the known good CAN communication line between ECM and IPDM-E. Through the previous procedure, the circuit between ADP splice and TCM has the most amount of lines (shade 3-a in the figure below). Place a check mark on the known good lines to establish the error circuit. Reception item of "IPDM-E": On "ECM", "OK" is indicated. IPDM-E communicates normally with ECM. Put a check mark on the normal circuit between ECM and IPDM-E (check mark 3-b in the figure below).
4. Through the above procedure, the error is detected in the TCM branch line (shaded in the figure below). NOTE: For abbreviations, refer to [ «HOW TO USE THIS SECTION»(ref-375702-S13079054472010102800000) ].
5. Perform the inspection for the detected error circuit. For the inspection procedure, refer to " «MALFUNCTION AREA CHART»(ref-375702-S20668220752010102800000) ".

Present Error - Short Circuit

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.

Received data

INDICATION REFERENCE

Error symptom

1. Most the units connected to the CAN communication system go into fail-safe mode or are deactivated.

Inspection procedure

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1. Refer to " «MALFUNCTION AREA CHART»(ref-375702-S20668220752010102800000) ".

Past Error - Open Circuit

Review CAN communication signal chart based on information received from the interview with the customer and on past error information from DTC check and bus check.

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1. DTC check: Inspect the control units indicating "U1000" or "U1001" on DTC check.
2. Bus check (with PAST): Check the bus check (with PAST) of units indicating "U1000" or "U1001" on DTC check. Draw a line on the diagnosis sheet to indicate the possible error circuit. NOTE: For the details of each indication on bus check, refer to [ «BUS CHECK»(ref-375702-S22163526062010102800000) ]. Reception item of "ECM": "VDC/TCS/ABS", "3" is indicated in the "PAST". This means ECM could not receive the signal from ABS in the past. Draw a line between ECM and ABS (line 2-a in the figure below). Reception item of "M&A": "VDC/TCS/ABS", "3" is indicated in the "PAST". This means M&A could not receive the signal from ABS in the past. Draw a line between M&A and ABS (line 2-b in the figure below). Reception item of "TCM": "VDC/TCS/ABS", "3" is indicated in the "PAST". This means TCM could not receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the figure below).
3. Bus check (without PAST): Check the bus check (without PAST) of units indicating "U1000" or "U1001" on DTC check. Draw a line on the diagnosis sheet to indicate the possible error circuit. NOTE: While an error occurred in the past according to DTC check, it is unclear which signal is not received. Assume that errors were detected from all reception items. Draw a single line among the unit and all reception items. (Work flow differs from Bus check (with PAST).) Reception item of "EPS": Assume that the unit could not receive the signals from ECM, ABS, and M&A. Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below). Reception item of "ABS": Assume that the unit could not receive the signal from ECM. Draw a line between ABS and ECM (line 3-b in the figure below).
4. Search for the possible cause using CAN communication signal chart using information from the interview with the customer. NOTE: For the details of CAN communication signal, refer to [ «CAN COMMUNICATION SIGNAL CHART»(ref-375702-S18701302312010102800000) ]. ABS warning lamp turned ON and speedometer did not move: This means that "ABS warning lamp signal" and "Vehicle speed signal" could not communicate between M&A and ABS (4-a in the figure below). The tachometer moved normally: This means that "Engine speed signal" could communicate normally between ECM and M&A (4-b in the figure below).
5. Fill out the diagnosis sheet based on information from step 4. The ABS warning lamp turned ON and speedometer did not move: Assume that a possible cause is no communication between M&A and ABS. Draw a line between M&A and ABS. (Line 5-a in the figure below). The tachometer moved normally: Put check marks between ECM and M&A. The circuit between ECM and M&A is functioning properly (check marks 5-b in the figure below).
6. The circuit which has the most amount of lines are the possible cause. Error is detected from ABS actuator and electric unit (control unit) branch line (shaded in the figure below). NOTE: For abbreviations, refer to [ «HOW TO USE THIS SECTION»(ref-375702-S13079054472010102800000) ].
7. Perform the inspection procedure for the possible cause. Refer to " «MALFUNCTION AREA CHART»(ref-375702-S20668220752010102800000) ".

Past Error - Short Circuit

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.

INSPECTION PROCEDURE CHART

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CAN Communication Signal Chart

Refer to [ LAN SYSTEM: BASIC INSPECTION ] for how to use CAN communication signal chart.

Note. Refer to [ HOW TO USE THIS SECTION ] for the abbreviations of the connecting units.

CAN COMMUNICATION SIGNAL CHART

Note. CAN data of the air bag diagnosis sensor unit is not used by usual service work, thus it is omitted.

Bus Check

Use "Bus check" for detecting the root cause.

ECM

0: Error at present, 1 - 39: Error in the past (Number means the number of times the ignition switch is turned OFF-->ON)

ECM MONITOR ITEM LIST

TCM

Note. Replace the unit when "NG" is indicated on the "INITIAL DIAG".

TCM MONITOR ITEM LIST

Transfer Control Unit

Note. Replace the unit when "NG" is indicated on the "INITIAL DIAG".

TRANSFER CONTROL UNIT MONITOR ITEM

BCM

Note. Replace the unit when "NG" is indicated on the "INITIAL DIAG".

BCM UNIT MONITOR ITEM

Differential Lock Control Unit

Note. Replace the unit when "NG" is indicated on the "INITIAL DIAG".

DIFFERENTIAL LOCK CONTROL UNIT MONITOR ITEM

Combination Meter

0: Error at present, 1 - 39: Error in the past (Number means the number of times the ignition switch is turned OFF-->ON)

COMBINATION METER MONITOR ITEM

ABS Actuator and Electric Unit (Control Unit) (Models with ABS)

ABS ACTUATOR AND ELECTRIC UNIT MONITOR ITEM

ABS Actuator and Electric Unit (Control Unit) (Models with ABLS/Models with VDC)

ABS ACTUATOR AND ELECTRIC UNIT MONITOR ITEM

IPDM E/R

0: Error at present, 1 - 39: Error in the past (Number means the number of times the ignition switch is turned OFF-->ON)

IPDM E/R MONITOR ITEM

Main Line

MAIN LINE MALFUNCTION AREA CHART

Branch Line

BRANCH LINE MALFUNCTION AREA CHART

Short Circuit

SHORT CIRCUIT MALFUNCTION AREA CHART

Main Line Between TCM and DLC Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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 Is the inspection result normal? GO TO 2. Repair the terminal and connector. 2 CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the following harness connectors. A/T assembly Harness connectors F14 and E5 Check the continuity between the A/T assembly harness connector and the harness connector. Is the inspection result normal? GO TO 3. 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 the harness connectors. Is the inspection result normal? GO TO 4. Repair the main line between the harness connectors E5 and E152. 4 CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Check the continuity between the harness connector and the data link connector. Is the inspection result normal? Check the following items again. Decision of CAN system type. Not received SDT data [DTC check, Bus check ("ECU list" included)]. Procedure for detecting root cause. Error was detected in the main line between the TCM and the data link connector

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Main Line Between DLC and ABS Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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 Is the inspection result normal? GO TO 2. 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. Is the inspection result normal? GO TO 3. 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. Models with VDC Models without VDC Is the inspection result normal? Check the following items again. Decision of CAN system type. Not received SDT data [DTC check, Bus check ("ECU list" included)]. Procedure for detecting root cause. Error was detected in the main line between the data link connector and the ABS actuator and electric unit (control unit)

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ECM Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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 Harness connector E152 Harness connector M31 A/T models ECM Harness connector E2 Harness connector F32 Is the inspection result normal? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 the following. QR25DE: [ POWER SUPPLY AND GROUND CIRCUIT CHECK ] VQ40DE: [ POWER SUPPLY AND GROUND CIRCUIT CHECK ] Is the inspection result normal? Replace the ECM. Refer to the following. QR25DE: [ PROCEDURE AFTER REPLACING ECM ] VQ40DE: [ PROCEDURE AFTER REPLACING ECM ] Error was detected in the ECM branch line

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TCM Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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). Is the inspection result normal? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. Repair the TCM branch line. 3 CHECK HARNESS FOR OPEN CIRCUIT Remove the control valve with TCM. Refer to [ CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2: ON-VEHICLE REPAIR ] Disconnect the connector of TCM. Check the continuity between the A/T assembly harness connector and TCM harness connector. Is the inspection result normal? GO TO 4. Repair the harness between the A/T assembly harness connector and the TCM harness connector. 4 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 CHECK ] Is the inspection result normal? Replace the control valve with TCM. Refer to [ CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2: ON-VEHICLE REPAIR ] Error was detected in the TCM branch line

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4WD Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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). Is the inspection result normal? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ] Is the inspection result normal? Replace the transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ] Error was detected in the transfer control unit branch line

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BCM Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 [ POWER SUPPLY AND GROUND CIRCUIT CHECK ] Is the inspection result normal? Replace the BCM. Refer to [ BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ] Error was detected in the BCM branch line

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DIFF Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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). Is the inspection result normal? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 [ P1833 INITIAL START ] Is the inspection result normal? Replace the differential lock control unit. Refer to [ DIFFERENTIAL LOCK CONTROL UNIT: REMOVAL AND INSTALLATION ] Error was detected in the differential lock control unit branch line

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DLC Branch Line Circuit Check

DIAGNOSIS PROCEDURE

MA Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 CHECK [COMBINATION METER] ] Is the inspection result normal? Replace the combination meter. Refer to [ COMBINATION METER: REMOVAL AND INSTALLATION ] Error was detected in the combination meter branch line

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STRG Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 [ ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT): WIRING DIAGRAM [VDC] ] Is the inspection result normal? Replace the steering angle sensor. Refer to [ STEERING ANGLE SENSOR: REMOVAL AND INSTALLATION ] Error was detected in the steering angle sensor branch line

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ABS Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. 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. Models with VDC Models without VDC Is the measurement value within the specification? GO TO 3. 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. Type 1: [ C1109 POWER AND GROUND SYSTEM ] Type 2: [ C1109 POWER AND GROUND SYSTEM ] Type 3: [ C1109 POWER AND GROUND SYSTEM ] Is the inspection result normal? Replace the ABS actuator and electric unit (control unit). Refer to the following. Type 1: [ ACTUATOR AND ELECTRIC UNIT (ASSEMBLY): REMOVAL AND INSTALLATION ] Type 2: [ ACTUATOR AND ELECTRIC UNIT (ASSEMBLY): REMOVAL AND INSTALLATION ] Type 3: [ ACTUATOR AND ELECTRIC UNIT (ASSEMBLY): REMOVAL AND INSTALLATION ] Error was detected in the ABS actuator and electric unit (control unit) branch line

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IPDM-E Branch Line Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. 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. Is the measurement value within the specification? GO TO 3. 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 [ POWER SUPPLY AND GROUND CIRCUIT CHECK ] Is the inspection result normal? Replace the IPDM E/R. Refer to [ IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM): REMOVAL AND INSTALLATION ] Error was detected in the IPDM E/R branch line

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CAN Communication Circuit Check

DIAGNOSIS PROCEDURE Step Action YES NO 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? GO TO 2. Repair the terminal and connector. 2 CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector terminals. Is the inspection result normal? GO TO 3. 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. Is the inspection result normal? GO TO 4. 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. 3. Check the resistance between the IPDM E/R terminals. Is the measurement value within the specification? GO TO 5. 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 GO TO 6. 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 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 Connect the connector. Check other units as per the above procedure. Replace the unit whose connector was disconnected

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