DTC Code | DTC Name |
---|---|
HOW TO PROCEED WITH TROUBLESHOOTING |
CAUTION / NOTICE / HINT
PRECAUTIONS WHEN TROUBLESHOOTING
Note
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
If the CAN communication system is malfunctioning, check the contact pressure of the terminals in connectors, as insufficient terminal contact pressure may be the cause.
Refer to Diagnosis System for CAN communication system DTCs.
Refer to troubleshooting of each system if DTCs regarding the CAN communication system are not output.
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
CAN communication DTCs are output for CAN main bus and CAN branch malfunctions as well as for internal malfunctions or power source malfunctions of ECUs or sensors for systems using CAN communication. Therefore, when DTCs for internal malfunctions or power source malfunctions of corresponding systems are output at the same time as CAN communication DTCs, troubleshoot according to the internal malfunction and power source malfunction DTCs.
The DLC3 inspection can only be used to detect malfunctions in the diagnosis bus (the bus which connects the DLC3 to the central gateway ECU (network gateway ECU)).
An open in a branch for ECUs or sensors that are connected to the CAN main bus can be checked by performing a CAN bus check using the GTS. (This inspection is possible when all the main bus lines are normal.)
If there was a communication error, the probable ECU or sensor for which communication stopped can be determined using the combination of communication DTCs (DTCs that start with U) that are output.
If a sub bus has a communication error, the gateway function equipped ECU (sub bus monitor ECU) detects it and stores DTCs related to the error.
Tech Tips
On the GTS, gateway function equipped ECUs display DTCs for ECUs connected to the sub bus.
When an open circuit is detected, before disconnecting related connectors for inspection, push in on the connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
VEHICLE BROUGHT TO WORKSHOP
Tech Tips
If the engine switch can be turned on (IG) (the power source mode can be changed to on (IG)) when the vehicle is brought in for repair, check for DTCs and check the illumination condition of the indicators in the combination meter assembly and the basic operation of the vehicle (such as steering operation) promptly.
Do not turn the engine switch off until the inspection of the vehicle is finished, as some fail-safe functions are canceled when the engine switch is turned off.
If the engine switch cannot be turned on (IG) (the power source mode cannot be changed to on (IG)) when the vehicle is brought in, measure the voltage of the battery. If the voltage is below 11 V, recharge or replace the battery before performing troubleshooting.
If the engine switch cannot be turned on (IG) even though the battery voltage is normal, repair this malfunction before performing troubleshooting.
Result | ||
---|---|---|
|
NEXT |
CUSTOMER PROBLEM ANALYSIS
Tech Tips
When troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Ask the customer if the vehicle is/was equipped with additional devices such as a theft deterrent device or monitor. (If equipped, explain to the customer that the additional devices will be removed before performing troubleshooting as the malfunction cannot be checked properly.)
Examples of points to be confirmed are shown below.
It is useful to confirm the symptoms and the conditions in which the vehicle was operating at the time when a malfunction occurred. This helps to narrow down the malfunctioning part.
Tech Tips
What was affected (system, part or meter warning indicators)
What happened (details of the malfunction)
When (occurrence date and time, frequency and if it recurs or not)
Under what kind of situation did the problem occur (driving and operating condition at the occurrence and weather)
Road type or condition (city, suburb, paved road, unpaved road, highway, etc.)
Return conditions (what made the vehicle return to normal, for example, the engine switch was turned off)
Symptom |
|
Meter warning lights |
|
Result | ||
---|---|---|
|
NEXT |
CHECK GTS OPERATION
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Check that the GTS and ECUs can communicate with the engine switch on (IG).
Tech Tips
If communication is not possible, the GTS screen will indicate an error.
If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.
When communication between the GTS and the vehicle is not possible, but communication is possible when the GTS is connected to another vehicle, the vehicle is malfunctioning. Inspect the CANH and CANL branch lines of the DLC3 and the ECU power source circuits (in this case perform steps 27 to 28 first). In addition, check that the BAT terminal of the DLC3 receives battery voltage (11 V or more).
If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
CHECK V BUS BRANCH LINE (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) Click here |
C |
REFER TO GTS OPERATOR'S MANUAL |
A |
CHECK DTC (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.
OK |
---|
DTC B1003 is not output. |
Result | |||
---|---|---|---|
|
OK |
GO TO STEP 6 Click here |
NG |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
Replace the central gateway ECU (network gateway ECU).
Tech Tips
DTC B1003 is stored when a malfunction is detected in the non-volatile storage of the central gateway ECU (network gateway ECU). As DTC B1003 is not related to a communication malfunction, continue with troubleshooting to find the cause of the communication malfunction after replacing the central gateway ECU (network gateway ECU).
Result | ||
---|---|---|
|
NEXT |
CHECK DTC
Using the GTS, perform Health Check to read current and history DTCs and record them.
Note
CAN communication DTCs are output when there is an open or short in any of the communication lines. Any problems with the power source of a corresponding ECU or sensor, or problems in the ECU or sensor itself also cause these DTCs to be output.
If a CAN communication line connector is disconnected with the engine switch on (IG), the ECUs of the corresponding system and related systems store a DTC.
Tech Tips
If an open in a CAN main bus line, a short between the CAN bus lines (CANH and CANL) or a short to ground or +B in a CAN bus occurs, DTCs of almost all ECUs and sensors on the CAN bus may be output (or a message indicating a communication error may be displayed on the GTS screen). In this case, check the resistance of the CAN bus (steps 9 to 20) first.
If an open occurs in just one of the wires of a CAN branch line, DTCs which are not related to malfunctioning parts may be output (DTCs may be displayed randomly), or a message indicating a communication error may be displayed.
Read the freeze frame data using the GTS and record it.
Result | ||
---|---|---|
|
NEXT |
PERFORM COMMUNICATION MALFUNCTION CHECK (CONNECTION STATUS CHECK USING GTS)
Select "Communication Malfunction Check" from the screen on the GTS.
Record all the DTCs stored for ECUs and sensors.
Result | ||
---|---|---|
|
NEXT |
PERFORM CAN BUS CHECK (CONNECTION STATUS CHECK USING GTS)
Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.
Select "CAN Bus Check" from the screen on the GTS.
Observe the screen for approximately 2 minutes to check the ECUs and sensors displayed on the screen.
Result | ||
---|---|---|
|
NEXT |
CHECK BUS 2 MAIN LINE (CANH - CANL)
Note
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
Tech Tips
Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Disconnect the cable from the negative (-) battery terminal.
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
GO TO OPEN IN BUS 2 MAIN BUS LINE Click here |
C |
GO TO SHORT IN BUS 2 LINES Click here |
A |
CHECK FOR SHORT TO GND IN BUS 2 (CANH, CANL - CG)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO GND IN BUS 2 LINE Click here |
OK |
CHECK FOR SHORT TO +B IN BUS 2 (CANH, CANL - BAT)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO +B IN BUS 2 LINE Click here |
OK |
CHECK BUS 3 MAIN LINE (CANH - CANL)
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
GO TO OPEN IN BUS 3 MAIN BUS LINE Click here |
C |
GO TO SHORT IN BUS 3 LINES Click here |
A |
CHECK FOR SHORT TO GND IN BUS 3 (CANH, CANL - CG)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO GND IN BUS 3 LINE Click here |
OK |
CHECK FOR SHORT TO +B IN BUS 3 (CANH, CANL - BAT)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
GO TO STEP 18 Click here |
C |
GO TO SHORT TO +B IN BUS 3 LINE Click here |
A |
CHECK BUS 4 MAIN LINE (CANH - CANL)
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
GO TO OPEN IN BUS 4 MAIN BUS LINE Click here |
C |
GO TO SHORT IN BUS 4 LINES Click here |
A |
CHECK FOR SHORT TO GND IN BUS 4 (CANH, CANL - CG)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO GND IN BUS 4 LINE Click here |
OK |
CHECK FOR SHORT TO +B IN BUS 4 (CANH, CANL - BAT)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO +B IN BUS 4 LINE Click here |
OK |
CHECK BUS 5 MAIN LINE (CANH - CANL)
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
GO TO OPEN IN BUS 5 MAIN BUS LINE Click here |
C |
GO TO SHORT IN BUS 5 LINES Click here |
A |
CHECK FOR SHORT TO GND IN BUS 5 (CANH, CANL - CG)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO GND IN BUS 5 LINE Click here |
OK |
CHECK FOR SHORT TO +B IN BUS 5 (CANH, CANL - BAT)
Measure the resistance according to the value(s) in the table below.
*1 | DLC3 | - | - |
*a | Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
GO TO SHORT TO +B IN BUS 5 LINE Click here |
OK |
CHECK RESULT OF CAN BUS CHECK (CONNECTION STATUS CHECK USING GTS)
Inspect or repair the probable malfunctioning part based on the check result of step 8 (the step in which CAN bus check was performed).
Result of CAN Bus Check (Connection Status Check Using GTS) | ||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Note
*: In this case, as the main body ECU (multiplex network body ECU) (Main Body) outputs communication DTCs (DTCs that start with U), the problem area can be determined from those DTCs.
Non-installed ECUs or sensors will not be displayed. Do not mistake them for being in communication stop mode.
It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu on the GTS. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)
Tech Tips
Regarding CAN Bus Check, refer to How to Interpret CAN Bus Check Screen.
If the detection status of any ECU changes during the inspection, one of the branch lines of a connected ECU or sensor may be open. (Signals from the ECU or sensor that has an open in one of its branch lines create electrical noise, affecting response to the GTS and whether or not the ECUs and sensors are displayed.)
Regarding the ECUs connected to sub bus 1, the main body ECU (multiplex network body ECU) displays communicating ECUs on the GTS. If the communication between the main body ECU (multiplex network body ECU) and an ECU stops for 10 seconds or more, the ECU will no longer be displayed on the GTS.
Regarding the communication stop mode for ECUs connected to sub bus 1, refer to the inspection procedure for the DTCs that indicate a communication stop.
B |
GO TO U1002 (Main Body) Click here |
C |
GO TO MAIN BODY ECU COMMUNICATION STOP MODE Click here |
D |
GO TO CENTRAL GATEWAY ECU COMMUNICATION STOP MODE Click here |
E |
GO TO COMMUNICATION STOP MODE TABLE Click here |
F |
GO TO DIAGNOSTIC TROUBLE CODE CHART Click here |
G |
GO TO OPEN IN ONE SIDE OF BUS 2 BRANCH LINE Click here |
H |
GO TO OPEN IN ONE SIDE OF BUS 3 BRANCH LINE Click here |
I |
GO TO OPEN IN ONE SIDE OF BUS 4 BRANCH LINE Click here |
J |
GO TO OPEN IN ONE SIDE OF BUS 5 BRANCH LINE Click here |
A |
CHECK RESULT OF COMMUNICATION MALFUNCTION CHECK (SELECT THE MALFUNCTIONING BUS)
Inspect or repair the probable malfunctioning part based on the check result of step 7 (the step in which checking for communication malfunction DTCs was performed).
Result of Communication Malfunction Check (Select Malfunctioning Bus) | ||||||||
---|---|---|---|---|---|---|---|---|
|
Tech Tips
The term ''sub bus monitor ECU'' refers to a gateway function equipped ECU that is able to monitor a bus and store DTCs.
When checking for communication DTCs, refer to How to Interpret Communication DTCs (DTCs that start with U).
Because a gateway function equipped ECU (sub bus monitor ECU) monitors signals from all ECUs that are connected to its sub bus, a gateway function equipped ECU can detect ECUs with a communication stop more accurately. In this case, perform troubleshooting by referring to the DTC combination table for the sub bus.
If communication DTCs are stored, and all ECUs and sensors connected to the CAN communication system are displayed on the CAN Bus Check screen of the GTS, a past malfunction that is currently not occurring is suspected.
When a CAN branch of the bus 2, bus 3, bus 4 or bus 5 is malfunctioning, because the ECUs and sensors related to it detect the malfunction, the problem area can be determined using the combination of DTCs that are output.
When sub bus 1 is malfunctioning, the main body ECU (multiplex network body ECU) detects a communication stop for connected ECUs and a network communication error, and stores DTCs.
On the GTS, the Main Body item displays the DTCs for ECUs connected to sub bus 1.
When both the sub bus monitor ECU and the ECUs connected to the bus 2, bus 3, bus 4 or bus 5 store communication DTCs, check and repair the corresponding sub bus first.
B |
GO TO U1002 (Main Body) Click here |
C |
GO TO DIAGNOSTIC TROUBLE CODE CHART Click here |
A |
DTC COMBINATION TABLE
Determine the ECUs or sensors that were not communicating based on the combination of DTCs output from each ECU.
Result | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
CAN communication system history DTCs may indicate the problem if CAN communication system DTCs are output and all ECUs and sensors connected to the CAN communication system are displayed on the CAN Bus Check screen of the GTS.
B |
GO TO COMMUNICATION STOP MODE TABLE Click here |
A |
IDENTIFICATION OF PROBLEM (PAST MALFUNCTION IN MAIN BUS OF BUS 2, BUS 3, BUS 4 OR BUS 5)
Connect the cable to the negative (-) battery terminal.
Clear the DTCs using the GTS.
Perform the tests in Symptom Simulation to check the wire harnesses and connectors including those for main bus lines.
Based on the results of the check, inspect the parts that output DTCs to determine the malfunctioning part.
Tech Tips
If DTCs are output, do not turn the engine switch off.
Result | ||
---|---|---|
|
NEXT |
REPAIR OR REPLACEMENT
Result | ||
---|---|---|
|
NEXT |
CONFIRMATION TEST
Result | ||
---|---|---|
|
NEXT |
END |
CHECK V BUS BRANCH LINE (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
Note
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
Tech Tips
Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Disconnect the cable from the negative (-) battery terminal.
*1 | DLC3 |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE V BUS BRANCH LINE OR CONNECTOR (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
OK |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
Disconnect the O157 central gateway ECU (network gateway ECU) connector.
*a | Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Reconnect the cable to the negative (-) battery terminal.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
A |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here |
B |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
C |
GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT) Click here |