DTC B1194 (Twin Clutch System Model)
Precautions: Precautions for Diagnosing Trouble · Precautions for Replacing Remote Controller · Precautions for Remote Controller Disposal · Precautions for Replacing Keyless Start Control Module · Precautions for Control Systems · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
B1194: Starting Motor Relay Malfunction Inconsistency between starting motor control relay monitor input voltage and starting motor control relay ON condition is continued for longer than specified time. |
•Starting motor control relay circuit / connector
•Starting motor control relay •“ST” fuse •“ST SIG2” fuse •ST3 relay •TCM •Keyless start control module |
Circuit Diagram
| [A]: | TCM connector (View: [a]) | B2: | Starting motor control relay drive circuit No.2 | 4. | Starting motor control relay |
| [B]: | Keyless start control module connector (View: [a]) | C1: | ST3 relay ground circuit No.1 | 5. | “ST SIG2” fuse |
| [C]: | ECM connector (View: [a]) | C2: | ST3 relay ground circuit No.2 | 6. | TCM |
| A1: | Starting motor control relay signal circuit No.1 | 1. | “ST” fuse | 7. | Keyless start control module |
| A2: | Starting motor control relay signal circuit No.2 | 2. | Starting motor | 8. | ECM |
| B1: | Starting motor control relay drive circuit No.1 | 3. | ST3 relay |
DTC Confirmation Procedure
1)Start engine.
2)Stop engine.
3)Repeat Step 1) – 2) once.
DTC Troubleshooting
NOTE:
This DTC might be detected when battery is run down or the voltage is very low.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
DTC check
1)Check DTC in TCM.
Is there any DTC(s) detected?
|
Go to troubleshooting for applicable DTC.
|
Go to Step 2.
|
| 2 |
Fuse check
1)Check “ST” and “ST SIG2” fuses.
Is check result OK?
|
Go to Step 3.
|
Replace “ST” and/or “ST SIG2” fuse.
|
| 3 |
Starting motor control relay / ST3 relay check
1)Check starting motor control relay and ST3 relay.
Is check result OK?
|
Go to Step 4.
|
Replace starting motor control relay and/or ST3 relay.
|
| 4 |
Starting motor control relay drive circuit check
1)Set ignition “OFF”.
2)Disconnect starting motor control relay, ST3 relay and “E484” connector.
3)Check for proper terminal connection to starting motor control relay, ST3 relay and “E484” connectors.
4)If connections are OK, check the following points.
•Resistance of “B1” and “B2” circuits: less than 1 Ω
•Resistance between each of “B1” and “B2” circuits and ground: infinity •Resistance between “B1” circuit terminal and each terminal at “E484” connector: infinity •Resistance between “B2” circuit terminal and each terminal at ST3 relay connector: infinity •Voltage of “B1” and “B2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 5.
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Repair or replace defective wire harness.
|
| 5 |
ST3 relay ground circuit check
1)Set ignition “OFF”.
2)Check that resistance between each of “C1” and “C2” circuits and ground is less than 1 Ω.
Is check result OK?
|
Go to Step 6.
|
Repair or replace defective wire harness.
|
| 6 |
Starting motor control relay signal circuit check
1)Disconnect “E01” and starting motor connectors.
2)Check for proper terminal connection to “E01” and starting motor connectors.
3)If connections are OK, check the following points.
•Resistance of “A1” and “A2” circuits: less than 1 Ω
•Resistance between each of “A1” and “A2” circuits and ground: infinity •Resistance between “A1” circuit terminal and each terminal at starting motor control relay connector: infinity Is check result OK?
|
Replace keyless start control module and recheck DTC. If DTC B1194 is still detected, replace TCM and recheck DTC.
•Keyless start control module:
•TCM: |
Repair or replace defective wire harness.
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