U1122

Code

MITSUBISHI U — Network/User

ASC/TCL/ABS(CAN message)

Brand: MITSUBISHI

Type: U — Network/User

Views: UK: 13 EN: 20 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open/shorted/damaged CAN wiring or connectors to the ABS/ASC module
ABS/ASC module power or ground fault (blown fuse, poor ground, low battery voltage)
Faulty ABS/ASC control module (internal failure)
Missing or failed CAN termination resistor(s)
Intermittent connector corrosion or physical damage (water ingress, bent pins)
Software/firmware mismatch or module configuration error after replacement

Symptoms

ABS / ASC / TCL warning lamp illuminated
Traction control / stability control disabled or non-functional
ABS functions may be disabled (longer stopping distances possible)
Possible other network modules reporting communication errors
Loss of related features (cruise control, ABS-based functions)

What to check

Use a diagnostic scanner to read U1122 and any other U- or B- codes from all modules; note freeze frame and time of occurrence
Verify battery voltage (12V nominal) and check charge system condition
Inspect fuses and relays supplying ABS/ASC module power
Visually inspect ABS/ASC wiring harness and connectors for damage, corrosion, bent pins or water intrusion
Check CAN bus for presence of other network errors or bus-off events on a scan tool
Measure CAN_H and CAN_L voltages at the ABS connector with ignition ON (see signal_params)

Signal parameters

Battery/ignition supply to ABS ECU: ~11–14.5 V with key ON
Ground: low resistance to chassis (near 0 Ω)
CAN idle voltages (with no dominant bits): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each about mid-rail)
CAN dominant state voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approximate values)
Termination resistance between CAN_H and CAN_L: ≈ 60 Ω (two 120 Ω terminators in parallel)
Short to battery or ground will show CAN_H or CAN_L near 12 V or 0 V respectively

Diagnostic algorithm

Connect an OEM-level scan tool. Confirm U1122 and record any additional U-codes. Check for module presence and CAN traffic for the ABS/ASC module.
Verify battery voltage and ignition supply. If battery low, charge/retest before further diagnosis.
Inspect ABS/ASC module connectors and wiring for visible damage, corrosion, or loose pins. Repair as necessary.
Check fuses/relays related to ABS power/IGN. Replace any blown fuses and retest communication.
With ignition ON, measure CAN_H and CAN_L at the ABS connector and compare to signal parameters. Look for stuck high/low or no signal.
Measure termination resistance across CAN_H and CAN_L with key OFF. If not ~60 Ω, trace missing/failed terminator or open circuit.
If voltages and termination are OK, perform continuity checks from ABS connector to main CAN bus junctions and to other modules to find opens/shorts.
Use a scope or CAN BUS analyzer to inspect waveform integrity and to identify noise, dominant-state lock, or bus-off faults. Wiggle harness while monitoring for intermittent changes.
If wiring and bus are sound but the module fails to communicate, attempt reprogramming/reflash if available and recommended by manufacturer. Verify correct module coding after replacement.
If module remains non-communicative and all wiring, power, ground, and bus tests pass, replace ABS/ASC control module per manufacturer procedures. Clear codes and road-test to verify repair.

Likely causes

ABS/ASC ECU not powered or improperly grounded
CAN_H or CAN_L open or shorted near ABS/ASC module
Poor connector pin contact at ABS/ASC module
Failed ABS/ASC module electronics
Incorrect or missing termination (open/shorted resistor) on CAN pair

Fault status

⚠️ Status

Communication fault: invalid or missing CAN messages from ASC/TCL/ABS module — may disable ABS/traction control.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours

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Code

U1122

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Odometer

Brand: Other

Type: U — Network/User

Views: UK: 20 EN: 25 RU: 36

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open/shorted/damaged CAN wiring or connectors to the ABS/ASC module
ABS/ASC module power or ground fault (blown fuse, poor ground, low battery voltage)
Faulty ABS/ASC control module (internal failure)
Missing or failed CAN termination resistor(s)
Intermittent connector corrosion or physical damage (water ingress, bent pins)
Software/firmware mismatch or module configuration error after replacement

Symptoms

ABS / ASC / TCL warning lamp illuminated
Traction control / stability control disabled or non-functional
ABS functions may be disabled (longer stopping distances possible)
Possible other network modules reporting communication errors
Loss of related features (cruise control, ABS-based functions)

What to check

Use a diagnostic scanner to read U1122 and any other U- or B- codes from all modules; note freeze frame and time of occurrence
Verify battery voltage (12V nominal) and check charge system condition
Inspect fuses and relays supplying ABS/ASC module power
Visually inspect ABS/ASC wiring harness and connectors for damage, corrosion, bent pins or water intrusion
Check CAN bus for presence of other network errors or bus-off events on a scan tool
Measure CAN_H and CAN_L voltages at the ABS connector with ignition ON (see signal_params)

Signal parameters

Battery/ignition supply to ABS ECU: ~11–14.5 V with key ON
Ground: low resistance to chassis (near 0 Ω)
CAN idle voltages (with no dominant bits): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each about mid-rail)
CAN dominant state voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approximate values)
Termination resistance between CAN_H and CAN_L: ≈ 60 Ω (two 120 Ω terminators in parallel)
Short to battery or ground will show CAN_H or CAN_L near 12 V or 0 V respectively

Diagnostic algorithm

Connect an OEM-level scan tool. Confirm U1122 and record any additional U-codes. Check for module presence and CAN traffic for the ABS/ASC module.
Verify battery voltage and ignition supply. If battery low, charge/retest before further diagnosis.
Inspect ABS/ASC module connectors and wiring for visible damage, corrosion, or loose pins. Repair as necessary.
Check fuses/relays related to ABS power/IGN. Replace any blown fuses and retest communication.
With ignition ON, measure CAN_H and CAN_L at the ABS connector and compare to signal parameters. Look for stuck high/low or no signal.
Measure termination resistance across CAN_H and CAN_L with key OFF. If not ~60 Ω, trace missing/failed terminator or open circuit.
If voltages and termination are OK, perform continuity checks from ABS connector to main CAN bus junctions and to other modules to find opens/shorts.
Use a scope or CAN BUS analyzer to inspect waveform integrity and to identify noise, dominant-state lock, or bus-off faults. Wiggle harness while monitoring for intermittent changes.
If wiring and bus are sound but the module fails to communicate, attempt reprogramming/reflash if available and recommended by manufacturer. Verify correct module coding after replacement.
If module remains non-communicative and all wiring, power, ground, and bus tests pass, replace ABS/ASC control module per manufacturer procedures. Clear codes and road-test to verify repair.

Likely causes

ABS/ASC ECU not powered or improperly grounded
CAN_H or CAN_L open or shorted near ABS/ASC module
Poor connector pin contact at ABS/ASC module
Failed ABS/ASC module electronics
Incorrect or missing termination (open/shorted resistor) on CAN pair

Fault status

⚠️ Status

Communication fault: invalid or missing CAN messages from ASC/TCL/ABS module — may disable ABS/traction control.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours

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