4F-39 Electronic Stability Program:
DTC C1091 / 1092 / 1093: ECM / TCM / 4WD Control Module Data in CAN Line Failure
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DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC U1073: Control Module Communication Bus Off
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Refer to “DTC U1073: Control Module Communication Bus Off: in Section 4E”.
DTC U1100: Lost Communication with ECM (Reception Error)
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Refer to “DTC U1100: Lost Communication with ECM (Reception Error): in Section 4E”.
DTC Detecting Condition Trouble Area
C1091:
ECM sent invalid signal to ESP® control module.
• Engine control system
•ECM
• ESP® control module
C1092:
TCM sent invalid signal to ESP® control module. (for A/T
model)
• A/T system
•TCM
• ESP® control module
C1093:
4WD control module sent invalid signal to ESP® control
module. (if equipped 4WD control module)
• 4WD control system
• 4WD control module
• ESP® control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 DTC check other control module than ESP®
1) Check DTC for ECM, TCM and/or 4WD control module.
Is there any DTC(s)?
Go to applicable DTC
diag. flow.
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
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