DESCRIPTION
Detection Item | Symptom | Trouble Area |
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Main Body ECU Communication Stop Mode | Any of the following conditions are met:
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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 engine 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 OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the G37 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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NG | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
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2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Remove the main body ECU (multiplex network body ECU).
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(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE: Perform this inspection with the wire harness connected to the instrument panel junction block assembly. |
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(c) Reconnect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
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MB-30 (ACC) - Body ground | Engine switch on (ACC) | 11 to 14 V |
MB-31 (BECU) - Body ground | Always | 11 to 14 V |
MB-32 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
NOTICE:
Perform this inspection with the wire harness connected to the instrument panel junction block assembly.
Result | Proceed to |
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OK | A |
NG (BECU) | B |
NG (ACC) | C |
NG (IG) | D |
NG (GND1) | E |
A | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
C | GO TO LIGHTING (INT) SYSTEM (ACC SIGNAL CIRCUIT) |
D | GO TO LIGHTING (INT) SYSTEM (IG SIGNAL CIRCUIT) |
E | GO TO STEP 4 |
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3. | CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 3F instrument panel junction block assembly connector.
(c) Reconnect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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OK | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT) |
4. | CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 3D instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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OK | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) |