Power Assisted Steering System: 6C-38
DTC “C1121”: Vehicle Speed Signal Circuit Malfunction (LT-A750XP/ZK9)
B931G36304012
Troubleshooting
NOTE
After repairing the trouble, clear the DTC using a SDS tool or mode coupler switch. Refer to “DTC
(Diagnostic Trouble Code) Deleting (LT-A750XP/ZK9) (Page 6C-21)”.
Possible Cause
• Faulty vehicle speed signal circuit.
• Faulty speed sensor.
• Faulty EPS control unit.
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Check the EPS control unit connector for loose or poor
contact. If OK, then check the vehicle speed signal lead
wire continuity.
Go to step 2. Bl/B wire open.
I931G3630031-01
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