4F-48 Electronic Stability Program:
DTC C1091 / C1094: ECM Data in CAN Line Failure / Invalid Torque Control Communication with
ECM
S7RS0B4604041
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC Detecting Condition Trouble Area
C1091:
ECM sent invalid signal to ESP® control module.
C1094:
Reception error of torque control signal with ECM
• Engine control system
•ECM
• ESP® control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP®.
Is DTC C1090 detected?
Go to applicable DTC
diag. flow.
Go to step 3.
3 DTC check other control module than ESP®
1) Check DTC for ECM.
Is there any DTC(s)?
Go to applicable DTC
diag. flow.
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.