Code
U1107
MITSUBISHI
U — Network/User
4WD CAN timeout/Not equipped
Views:
UK: 8
EN: 18
RU: 12
AI status
Completed
Completed
100%
Causes
- 4WD/AWD control module not powered or not installed (vehicle not equipped)
- Failed or intermittent CAN bus wiring (broken wire, short to ground/power)
- Corroded/loose connectors at module or junction points
- Blown fuse or lost ignition power to the 4WD module
- Faulty 4WD/AWD control module
- CAN bus termination missing or incorrect resistance
Symptoms
- 4WD/AWD system disabled or in limp mode
- 4WD warning lamp or communication warning lamp illuminated
- Inability to select 4WD modes or engage transfer case
- Related modules report communication errors or reduced functionality
- Stored U1107 plus other CAN/communication-related DTCs
What to check
- Confirm vehicle is supposed to have 4WD/AWD equipment for this VIN/trim
- Read all stored DTCs and freeze frame data with a capable scan tool
- Check battery voltage and main power/ground integrity
- Inspect fuses and relays supplying the 4WD control module
- Visually inspect connectors and wiring at 4WD module and junctions for corrosion or damage
- Verify presence of 4WD control module on network with a scan tool (module enumerates on the bus)
Signal parameters
- Typical idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both at ~2.5 V when recessive)
- Dominant condition differential: CAN_H ~3.5–4.0 V, CAN_L ~1.0–1.5 V (difference ≈2 V)
- Termination: two 120 Ω resistors in parallel → ≈60 Ω across CAN_H and CAN_L (measure with ignition off)
- Bus baud rate: vehicle-specific (commonly 125 kbps or 500 kbps) — confirm with manufacturer specification
Diagnostic algorithm
- Verify vehicle equipment: confirm 4WD/AWD option fitted for VIN and model year.
- Retrieve and record all communication-related DTCs and freeze frame data.
- With key on (engine off), check battery voltage is stable and inspect relevant fuses/relays for 4WD module power.
- Visually inspect connectors and wiring at the 4WD control unit and any intermediate junctions; repair corroded or damaged connectors.
- Use a scan tool to see if the 4WD control module appears on the network; if it does not, proceed to wiring/power checks.
- Measure power and ground at the 4WD module connector pins; repair any open/low connections.
- Measure CAN_H and CAN_L voltages at the module connector with a DMM and compare to expected values in signal_params.
- Measure termination resistance across CAN_H and CAN_L with ignition off; expected ≈60 Ω. If open or incorrect, locate missing/failed terminator or shorted line.
- Wiggle test harness with scan tool monitoring to try to reproduce intermittent faults.
- If wiring, connectors and power are verified good and the module still does not communicate, consult OEM procedure for module programming and consider replacing the 4WD module.
- After repairs, clear codes, confirm module enumeration on the bus and perform a road test to verify proper 4WD operation.
Likely causes
- Blown fuse or missing power/ground to 4WD module
- Loose/damaged connector at 4WD control unit or harness splice
- Open or shorted CAN_H or CAN_L wiring to the module
- Module not fitted on this vehicle variant (expected condition)
- Failed 4WD module
Fault status
Status
No response from 4WD control module on the 4WD CAN bus — communication timeout or module not fitted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1107
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Legislated Diagnostics
Views:
UK: 15
EN: 22
RU: 17
AI status
Completed
Completed
100%
Causes
- 4WD/AWD control module not powered or not installed (vehicle not equipped)
- Failed or intermittent CAN bus wiring (broken wire, short to ground/power)
- Corroded/loose connectors at module or junction points
- Blown fuse or lost ignition power to the 4WD module
- Faulty 4WD/AWD control module
- CAN bus termination missing or incorrect resistance
Symptoms
- 4WD/AWD system disabled or in limp mode
- 4WD warning lamp or communication warning lamp illuminated
- Inability to select 4WD modes or engage transfer case
- Related modules report communication errors or reduced functionality
- Stored U1107 plus other CAN/communication-related DTCs
What to check
- Confirm vehicle is supposed to have 4WD/AWD equipment for this VIN/trim
- Read all stored DTCs and freeze frame data with a capable scan tool
- Check battery voltage and main power/ground integrity
- Inspect fuses and relays supplying the 4WD control module
- Visually inspect connectors and wiring at 4WD module and junctions for corrosion or damage
- Verify presence of 4WD control module on network with a scan tool (module enumerates on the bus)
Signal parameters
- Typical idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both at ~2.5 V when recessive)
- Dominant condition differential: CAN_H ~3.5–4.0 V, CAN_L ~1.0–1.5 V (difference ≈2 V)
- Termination: two 120 Ω resistors in parallel → ≈60 Ω across CAN_H and CAN_L (measure with ignition off)
- Bus baud rate: vehicle-specific (commonly 125 kbps or 500 kbps) — confirm with manufacturer specification
Diagnostic algorithm
- Verify vehicle equipment: confirm 4WD/AWD option fitted for VIN and model year.
- Retrieve and record all communication-related DTCs and freeze frame data.
- With key on (engine off), check battery voltage is stable and inspect relevant fuses/relays for 4WD module power.
- Visually inspect connectors and wiring at the 4WD control unit and any intermediate junctions; repair corroded or damaged connectors.
- Use a scan tool to see if the 4WD control module appears on the network; if it does not, proceed to wiring/power checks.
- Measure power and ground at the 4WD module connector pins; repair any open/low connections.
- Measure CAN_H and CAN_L voltages at the module connector with a DMM and compare to expected values in signal_params.
- Measure termination resistance across CAN_H and CAN_L with ignition off; expected ≈60 Ω. If open or incorrect, locate missing/failed terminator or shorted line.
- Wiggle test harness with scan tool monitoring to try to reproduce intermittent faults.
- If wiring, connectors and power are verified good and the module still does not communicate, consult OEM procedure for module programming and consider replacing the 4WD module.
- After repairs, clear codes, confirm module enumeration on the bus and perform a road test to verify proper 4WD operation.
Likely causes
- Blown fuse or missing power/ground to 4WD module
- Loose/damaged connector at 4WD control unit or harness splice
- Open or shorted CAN_H or CAN_L wiring to the module
- Module not fitted on this vehicle variant (expected condition)
- Failed 4WD module
Fault status
Status
No response from 4WD control module on the 4WD CAN bus — communication timeout or module not fitted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email