Toyota CH-R Service Manual: Check Bus 1 Line for Short to GND
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
|
Symptom |
Trouble Area |
|---|---|
|
No resistance exists between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3. |
|
WIRING DIAGRAM
w/o Blind Spot Monitor System
w/ Blind Spot Monitor System
CAUTION / NOTICE / HINT
NOTICE:
- 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.
Click here
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- Before measuring the resistance of the CAN bus, turn the ignition 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 ignition 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.
Click here
- After performing repairs, perform the DTC check procedure and confirm
that the DTCs are not output again.
DTC check procedure: Turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch), turn the cruise control main switch on, turn the LDA main switch on and then drive the vehicle at a speed of 40 km/h (25 mph) or more for approximately 52 seconds or more.
- After the repair, perform the CAN bus check and check that all the ECUs
and sensors connected to the CAN communication system are displayed as normal.
Click here
HINT:
- Before disconnecting related connectors for inspection, push in on each 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
|
1. |
CHECK VEHICLE TYPE |
(a) Check vehicle type.
|
Result |
Proceed to |
|---|---|
|
w/o Blind Spot Monitor System |
A |
|
w/ Blind Spot Monitor System |
B |
| B | .gif) |
GO TO STEP 4 |
|
.gif)
|
2. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Forward Recognition Camera (w/ Toyota Safety Sense P) |
|
*c |
to Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense P) |
*d |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
F112-2 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward recognition camera*1 |
|
F112-13 (CANL) - F41-4 (CG) |
|||
|
F112-3 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter wave radar sensor assembly*1 |
|
F112-14 (CANL) - F41-4 (CG) |
|||
|
F112-4 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
F112-15 (CANL) - F41-4 (CG) |
|||
|
F112-5 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
F112-16 (CANL) - F41-4 (CG) |
- *1: w/ Toyota Safety Sense P
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
|
NG (Line to ECU or sensor) |
C |
| A | |
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C | |
GO TO STEP 8 |
|
|
3. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the F74 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F112-4 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
F112-15 (CANL) - F41-4 (CG) |
||
|
F112-5 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
F112-16 (CANL) - F41-4 (CG) |
| OK | |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
| NG | |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
4. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 6 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
|
*c |
to Blind Spot Monitor Sensor LH |
*d |
to No. 1 CAN Junction Connector |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
M92-1 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
M92-12 (CANL) - F41-4 (CG) |
|||
|
M92-6 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Blind spot monitor sensor LH |
|
M92-17 (CANL) - F41-4 (CG) |
|||
|
M92-11 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 1 CAN junction connector |
|
M92-22 (CANL) - F41-4 (CG) |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
|
NG (Line to No. 1 CAN junction connector) |
C |
|
NG (Line to ECU or sensor) |
D |
| A | |
REPLACE NO. 6 CAN JUNCTION CONNECTOR |
| C | |
GO TO STEP 6 |
| D | |
GO TO STEP 8 |
|
|
5. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the F74 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
M92-1 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
M92-12 (CANL) - F41-4 (CG) |
| OK | |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
| NG | |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
6. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 1 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Forward Recognition Camera (w/ Toyota Safety Sense P) |
|
*c |
to Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense P) |
*d |
to No. 6 CAN Junction Connector |
|
*e |
to Central Gateway ECU (Network Gateway ECU) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
F112-2 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward recognition camera*1 |
|
F112-13 (CANL) - F41-4 (CG) |
|||
|
F112-3 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter wave radar sensor assembly*1 |
|
F112-14 (CANL) - F41-4 (CG) |
|||
|
F112-4 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 6 CAN junction connector |
|
F112-15 (CANL) - F41-4 (CG) |
|||
|
F112-5 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
|
F112-16 (CANL) - F41-4 (CG) |
- *1: w/ Toyota Safety Sense P
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
|
NG (Line to No. 6 CAN junction connector) |
C |
|
NG (Line to ECU or sensor) |
D |
| A | |
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C | |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) |
| D | |
GO TO STEP 8 |
|
|
7. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the F74 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F112-5 (CANH) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
F112-16 (CANL) - F41-4 (CG) |
| OK | |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
| NG | |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
8. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (ECU OR SENSOR) |
(a) Reconnect all wire harness connectors.
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to GND is connected.
Click here
(c) 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F74-23 (CA1H) - F41-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
F74-8 (CA1L) - F41-4 (CG) |
HINT:
- If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
- If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to ground in the wire harness and repair or replace the wire harness or connector if necessary.
| OK | |
REPLACE ECU OR SENSOR |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Check Bus 1 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 23 (CA1H) of the central gateway ECU (network
gateway ECU) and terminal ...
Open in One Side of Bus 1 Branch Line
DESCRIPTION
When the CAN bus main lines are normal (no open, short to ground, short to +B
or short between lines) and there is an ECU or sensor on the "Communication Bus
Check" screen t ...
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Toyota CH-R Owners Manual
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Toyota CH-R Service Manual
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