Lexus IS250 IS220d GSE20 ALE20 4GR-FSE STARTING
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK OPERATION OF TACHOMETER
CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM (BEAN))
CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)
CHECK CONNECTORS
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)
READ VALUE OF INTELLIGENT TESTER
RECHECK FOR DTC
DTC B2286 Runnable Signal Malfunction
DESCRIPTION
This DTC is output when serial communication signals and multiplex communication signals in the circuit between the power source control ECU and ECM are inconsistent.
- When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
| DTC No. | DTC Detection Condition | Trouble Area |
| B2286 |
Serial communication signals and multiplex communication signals in the circuit between the power source control ECU and engine control ECU are inconsistent. |
Multiplex communication system
CAN communication system
ECM
Power source control ECU
Wire harness or connector
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK OPERATION OF TACHOMETER |
Run the engine and check if the function of the tachometer in the combination meter is normal.
- OK:
- Actual engine revolution speed and the revolution indicated on the tachometer are the same.
| | GO TO COMBINATION METER SYSTEM |
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| 2.CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM (BEAN)) |
Check for the multiplex network communication system DTCs B1210, B1214 and B1215.
- If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first .
| | GO TO MULTIPLEX COMMUNICATION SYSTEM |
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| 3.CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) |
Check for the CAN communication system DTC U0146.
- If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (LHD: , RHD: ).
| | GO TO CAN COMMUNICATION SYSTEM |
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Check that the connectors are securely connected and the terminals are not deformed or loose.
- OK:
- The connectors are securely connected and the terminals are not deformed or loose.
| | REPAIR OR REPLACE CONNECTORS |
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| 5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND) |
Disconnect the ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection (Symbols) | Condition | Specified Condition |
| J55-6 (GND2) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 6.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) |
Disconnect the A6 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection (Symbols) | Condition | Specified Condition |
| J55-2 (TACH) - A6-16 (TACH) | Always | Below 1 Ω |
| J55-2 (TACH) or A6-16 (TACH) - Body ground | Always | 10 kΩ or higher |
- If the result of the inspection for a short circuit is not as specified, there may be a short in the ECU.
| | REPAIR OR REPLACE HARNESS, CONNECTOR OR EACH ECU |
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| 7.READ VALUE OF INTELLIGENT TESTER |
Reconnect the connectors.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Check the DATA LIST for proper functioning of the engine running.
Power Source Control:| Item | Measurement Item/Display (Range) | Normal Condition | Diagnostic Note |
| E/G Cond | Engine condition/ STOP or RUN | STOP: Engine is stopped
RUN: Engine is running | - |
- OK:
- STOP (engine is stopped) and RUN (engine is running) appear on the screen.
After DTCs are all cleared, turn the engine switch on (IG). After 30 seconds have elapsed, check for DTCs again.
- OK:
- DTC B2286 is not output.
| | REPLACE POWER SOURCE CONTROL ECU |
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| OK | |
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| CHECK INTERMITTENT PROBLEMS |
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LEXUS IS250, IS220d / GSE20 ALE20
