DESCRIPTION
There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
Symptom | Trouble Area |
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Resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω. |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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HINT:
PROCEDURE
1. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the G98 No. 4 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) | *b | to DCM (Telematics Transceiver) (w/ Telematics Transceiver) |
*c | to Central Gateway ECU (Network Gateway ECU) | *d | to Option Connector (Bus Buffer ECU) (w/ CAN Compatible Optional Devices) |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
G98-8 (CANH) - G98-19 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | DCM (telematics transceiver)*1 |
G98-9 (CANH) - G98-20 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | Central gateway ECU (network gateway ECU) |
G98-10 (CANH) - G98-21 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher*2 1 MΩ or higher*3 | Option connector (bus buffer ECU)*2 |
G98-11 (CANH) - G98-22 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | Central gateway ECU (network gateway ECU) |
HINT:
If there is a short in a CAN bus line without any CAN compatible optional devices connected to the option connector, repair or replace the CAN bus branch line or the option connector.
Result | Proceed to |
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OK | A |
NG (Line to central gateway ECU (network gateway ECU)) | B |
NG (Line to ECU or sensor) | C |
B | GO TO STEP 3 |
C | GO TO STEP 4 |
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2. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Disconnect the G99 No. 4 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) | *b | to Radio Receiver Assembly |
*c | to Stereo Component Equalizer Assembly | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition | Connected to |
---|---|---|---|
G99-1 (CANH) - G99-12 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Radio receiver assembly |
G99-2 (CANH) - G99-13 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher | Stereo component equalizer assembly |
OK | REPLACE NO. 4 CAN JUNCTION CONNECTOR |
NG | GO TO STEP 4 |
3. | CHECK FOR SHORT IN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the G66 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
*a | Front view of wire harness connector (to No. 4 CAN Junction Connector) | *b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
G98-9 (CANH) - G98-20 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 1 MΩ or higher |
G98-11 (CANH) - G98-22 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 1 MΩ or higher |
OK | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
4. | CHECK FOR SHORT IN CAN BUS LINES (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 short circuited branch line is connected.
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(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT:
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OK | REPLACE ECU OR SENSOR |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |