Power control system
Parts location System information Troubleshooting Diagnostic trouble codes
POWER SUPPLY & WIRE HARNESS
POWER CONTROL SYSTEM
PARTS LOCATION
LIST OF DIAGNOSTIC CODES
HOW TO TROUBLESHOOT
1.
Bringing in the car
Next▼
2.
Phenomenon check
Next▼
3.
Checking of the diagnostic codes (Refer to 
)
)(1) DTC check
(2) Clearing diagnostic code
B
>Go to Step 5
A▼
4.
List of diagnostic codes (main inspection parts) or troubleshooting for each code
Result
| Result |
Go to |
|---|---|
| Fault location confirmed |
A |
| Fault location not confirmed |
B |
A
>Go to Step 7
B
>Go to Step 6
5.
Inspection with SSM3 (Refer to )
)(1) Perform a current data display & save / system operation check mode
Result
| Result |
Go to |
|---|---|
| Fault location not confirmed |
A |
| Fault location confirmed |
B |
B
>Go to Step 7
A▼
6.
Inspection of the ECM terminal voltage and circuit (Refer to )
)Next▼
7.
Repair faulty parts
Next▼
8.
Checking the diagnostic codes (Refer to )
)Next▼
Completed
CHECKING / CLEARING DIAGNOSTIC CODES
1. Checking diagnostic codes (with the SSM3)
(1) Turn the ignition switch to OFF.
(2) Connect the SSM3 to the DLC3.
(3) Turn the ignition to IG ON and use the SSM3 display to select [Each System Check] → [Integ. unit mode] → [Diagnostic Code(s) Display] to bring up the diagnostic code confirmation screen.
(4) Check the diagnostic codes.
2. Clearing of recorded diagnostic codes (with the SSM3)
(1) Turn the ignition switch to OFF.
(2) Connect the SSM3 to the DLC3.
(3) Turn the ignition to IG ON and use the SSM3 display to select [Each System Check] → [Integ. unit mode] → [Clear Memory].
(4) Select [Deletion] to delete the diagnostic codes.
CAUTION:
·If deletion is not possible, retry it after turning the ignition to IG OFF and then on again.
·Do not use the SSM3 to delete diagnostic codes until the cause of the trouble has been identified.
·Do not use the SSM3 to delete diagnostic codes until the cause of the trouble has been identified.
CIRCUIT FIGURE
ECM TERMINAL ARRANGEMENT
1. Instrument panel junction block ASSY, main body ECM (Network gateway computer).
Captions in illustration
| *1 |
Instrument panel junction block ASSY |
*2 |
Main body ECM (Network gateway computer) |
(1) Measure the voltage and resistance between terminals.
NOTE:
This inspection is performed from the back side of the connector with the connector in a connected state.
| Terminal No. (Terminal code) |
Input/Output |
Item |
Measuring condition |
Criteria |
|---|---|---|---|---|
| 3A-15←→ Chassis ground |
Input |
Voltage |
IG ON |
11 to 14V |
| 3A-20←→ Chassis ground |
Input |
Voltage |
IG ON |
11 to 14V |
| 3A-27←→ Chassis ground |
Input |
Voltage |
Always |
11 to 14V |
| 3C-19←→ Chassis ground |
Input |
Voltage |
Always |
11 to 14V |
| 3E-1←→ Chassis ground |
Input |
Voltage |
Always |
11 to 14V |
| 3A-12←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
| 3A-13←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
| 3B-18←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
| D6-1 (GND)←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
| A73-4 (GND)←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
(2) Remove the instrument panel junction block ASSY from the main body ECM (Network gateway computer).
(3) Measure the voltage and resistance between terminals.
| Terminal No. (Terminal code) |
Input/Output |
Item |
Measuring condition |
Criteria |
|---|---|---|---|---|
| MB-1 (BECU)←→ Chassis ground |
Input |
Voltage |
Always |
11 to 14V |
| MB-8 (IG)←→ Chassis ground |
Input |
Voltage |
IG ON |
11 to 14V |
| MB-9 (ACC)←→ Chassis ground |
Input |
Voltage |
ACC ON |
11 to 14V |
| MB-32 (BMPX)←→ Chassis ground |
Input |
Voltage |
Always |
11 to 14V |
| MB-11 (GND)←→ Chassis ground |
- |
Resistance |
Always |
Less than 1 Ω |
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. Data monitor list
(1) Turn the ignition switch to OFF.
(2) Connect the SSM3 to the DLC3.
(3) Turn the ignition switch to ON.
(4) Follow the SSM3 display and select [Each System Check] → [Integ. unit mode] → [Current Data Display & Check] to bring up the data monitor item list.
(5) Use the data monitor to judge whether a component is working or not, and to narrow down the location of trouble.
SSM3 screen: [Each System Check] → [Integ. unit mode] → [Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks (Main inspection items during a malfunction) |
|---|---|---|---|
| [BATT voltage (control)] |
·Shows the BATT (control) voltage. ·Display range: 0 - 21.4 V |
11 to 14 V |
When a malfunction occurs, it may be due to a problem with battery voltage. |
| [BATT voltage (BACKUP) ] |
·Shows the BATT voltage backup. ·Display range: 0 - 21.4 V |
11 to 14 V |
When a malfunction occurs, it may be due to a problem with battery voltage. |
| [ABS_CM Power Voltage] |
·Shows the IG power supply voltage. ·Display range: 0 - 21.4 V |
11 to 14 V |
When a malfunction occurs, it may be due to a problem with the IG circuit. |
| [ACC voltage] |
·Shows the ACC voltage. ·Display range: 0 - 21.4 V |
11 to 14 V |
When a malfunction occurs, it may be due to a problem with the ACC circuit. |
| DTC | B1010 | Integrated unit system error |
|---|
Circuit description
Inspection steps
1.
Clearing diagnostic code
(1) Clear the diagnostic code using the SSM3. (Refer to )
)Next▼
2.
DTC check
B
>Go to “How to simulate trouble phenomenon”. (Refer to)
)A▼
Replacement of the main body ECM (Network gateway computer) (Refer to )
)| DTC | B1011 | BATT power supply (control) malfunction |
|---|
Circuit description
B1011 is output when a BMPX circuit malfunction is detected.
NOTE:
If B1012 is output at the same time, there are some cases where all functions of the main body ECM (Network gateway computer) do not operate.
| Diagnostic codes |
Detecting conditions |
Faulty part |
|---|---|---|
| B1011 |
The BMPX voltage is 8.3 V or less, or 16.7 V or more (BMPX circuit malfunction) |
·Main body ECM (Network gateway computer) ·Instrument panel junction block ASSY ·Wiring harness or connector |
Circuit figure
Inspection steps
CAUTION:
Before performing troubleshooting, check the fuse for this circuit.
1.
Clearing diagnostic code
(1) Clear the diagnostic code using the SSM3. (Refer to )
)Next▼
2.
DTC check
B
>Go to “How to simulate trouble phenomenon”. (Refer to)
)A▼
3.
Inspection of the wiring harness and connector (BMPX voltage)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the instrument panel junction block ASSY connector 3C.
NG
>Repair or replacement of wiring harness or connector
OK▼
4.
Inspection of the wiring harness and connector (ECM ground)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the main body ECM (Network gateway computer) connectors D6 and A73.
(2) Disconnect the instrument panel junction block ASSY connector 3B.
NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Inspection of the instrument panel junction block ASSY itself
(1) Remove the instrument panel junction block ASSY. (Refer to )
)
NG
>Replacement of the instrument panel junction block ASSY (Refer to )
)OK▼
Replacement of the main body ECM (Network gateway computer) (Refer to ) a
) a| DTC | B1012 | BATT power supply (backup) malfunction |
|---|
Circuit description
B1012 is output when a BECU circuit malfunction is detected.
NOTE:
If B1011 is output at the same time, there are some cases where all functions of the main body ECM (Network gateway computer) do not operate.
| Diagnostic codes |
Detecting conditions |
Faulty part |
|---|---|---|
| B1012 |
The BECU voltage is 8.3 V or less, or 16.7 V or more (BECU circuit malfunction) |
·Main body ECM (Network gateway computer) ·Instrument panel junction block ASSY ·Wiring harness or connector |
Circuit figure
Inspection steps
CAUTION:
Before performing troubleshooting, check the fuse for this circuit.
1.
Clearing diagnostic code
(1) Clear the diagnostic code using the SSM3. (Refer to )
)Next▼
2.
DTC check
B
>Go to “How to simulate trouble phenomenon”. (Refer to)
)A▼
3.
Inspection of the wiring harness and connector (BECU voltage)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the instrument panel junction block ASSY connector 3A.
NG
>Repair or replacement of wiring harness or connector
OK▼
4.
Inspection of the wiring harness and connector (ECM ground) (Refer to )
)NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Inspection of the instrument panel junction block ASSY itself
(1) Remove the instrument panel junction block ASSY. (Refer to )
)
NG
>Replacement of the instrument panel junction block ASSY (Refer to )
)OK▼
Replacement of the main body ECM (Network gateway computer) (Refer to )
)| DTC | B1013 | IGN power supply failure |
|---|
Circuit description
B1013 is output when an IG circuit malfunction is detected.
| Diagnostic codes |
Detecting conditions |
Faulty part |
|---|---|---|
| B1013 |
The IG voltage is 8.3 V or less, or 16.7 V or more (IG circuit malfunction) |
·Main body ECM (Network gateway computer) ·Instrument panel junction block ASSY ·Wiring harness or connector |
Circuit figure
Inspection steps
CAUTION:
Before performing troubleshooting, check the fuse for this circuit.
1.
Clearing diagnostic code
(1) Clear the diagnostic code using the SSM3. (Refer to )
)Next▼
2.
DTC check
B
>Go to “How to simulate trouble phenomenon”. (Refer to)
)A▼
3.
Inspection of the wiring harness and connector (Power supply voltage)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the instrument panel junction block ASSY connectors 3A and 3E.
(2) Measure the voltage between the terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| 3A-15 - Chassis ground |
IG ON |
11 to 14 V |
| 3E-1 - Chassis ground |
Always |
11 to 14 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Instrument panel junction block ASSY connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
4.
Inspection of the wiring harness and connector (Ground)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the main body ECM (Network gateway computer) connectors D6 and A73.
(2) Disconnect the instrument panel junction block ASSY connectors 3A and 3B.
(3) Measure the resistance between the terminals.
NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Inspection of the instrument panel junction block ASSY itself
(1) Remove the instrument panel junction block ASSY. (Refer to )
)(2) Remove the instrument panel junction block ASSY from the main body ECM (Network gateway computer).
Captions in illustration
| *a |
Connector not connected (Instrument panel junction block ASSY) |
- |
- |
(3) Measure the resistance between the terminals.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| 3E-1 - MB-8 (IG) |
When battery voltage is not applied between terminals 3A-15 and 3A-12. |
10 kΩ or more |
| 3E-1 - MB-8 (IG) |
When battery voltage is applied between terminals 3A-15 and 3A-12. |
Less than 1 Ω |
| 3B-18 - MB-11 (GND) |
Always |
Less than 1 Ω |
NG
>Replacement of the instrument panel junction block ASSY (Refer to )
)OK▼
Replacement of the main body ECM (Network gateway computer) (Refer to )
)| DTC | B1014 | ACC power failure |
|---|
Circuit description
B1014 is output when an ACC circuit malfunction is detected.
| Diagnostic codes |
Detecting conditions |
Faulty part |
|---|---|---|
| B1014 |
The ACC voltage is 8.3 V or less, or 16.7 V or more (ACC circuit malfunction) |
·Main body ECM (Network gateway computer) ·Instrument panel junction block ASSY ·Wiring harness or connector |
Circuit figure
Inspection steps
CAUTION:
Before performing troubleshooting, check the fuse for this circuit.
1.
Clearing diagnostic code
(1) Clear the diagnostic code using the SSM3. (Refer to )
)Next▼
2.
DTC check
B
>Go to “How to simulate trouble phenomenon”. (Refer to)
)A▼
3.
Inspection of the wiring harness and connector (Power supply voltage)
NOTE:
For inspection procedures and precautions, please refer to .
.(1) Disconnect the instrument panel junction block ASSY connectors 3A and 3E.
(2) Measure the voltage between the terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| 3A-20 - Chassis ground |
ACC ON |
11 to 14 V |
| 3E-1 - Chassis ground |
Always |
11 to 14 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Instrument panel junction block ASSY connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
4.
Inspection of the wiring harness and connector (Ground) (Refer to )
)NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Inspection of the instrument panel junction block ASSY itself
(1) Remove the instrument panel junction block ASSY. (Refer to )
)(2) Remove the instrument panel junction block ASSY from the main body ECM (Network gateway computer).
Captions in illustration
| *a |
Connector not connected (Instrument panel junction block ASSY) |
- |
- |
(3) Measure the resistance between the terminals.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| 3E-1 - MB-9 (ACC) |
When battery voltage is not applied between terminals 3A-20 and 3A-12. |
10 kΩ or more |
| 3E-1 - MB-9 (ACC) |
When battery voltage is applied between terminals 3A-20 and 3A-12. |
Less than 1 Ω |
| 3B-18 - MB-11 (GND) |
Always |
Less than 1 Ω |
NG
>Replacement of the instrument panel junction block ASSY (Refer to )
)OK▼
Replacement of the main body ECM (Network gateway computer) (Refer to )
)