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Home / DTC / C1226 — FR inlet valve

C1226 — FR inlet valve

Detailed page for trouble code C1226.

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Code

C1226

MITSUBISHI C — Chassis

FR inlet valve

Brand: MITSUBISHI
Type: C — Chassis
AI status
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Page language: EN

Causes

  • Damaged or corroded wiring/connectors to FR inlet valve
  • Open or shorted valve coil (solenoid)
  • Poor power supply or ground to ABS modulator
  • Hydraulic contamination or valve sticking inside the ABS hydraulic unit
  • Internal failure of the ABS hydraulic control unit (modulator)
  • Blown fuse or poor battery/charging system voltage

Symptoms

  • ABS warning lamp illuminated (possibly alongside traction/stability lamp)
  • Loss or reduction of ABS/traction control functionality
  • Changes in brake pedal feel when ABS activates or unusual pulsation
  • Uncommanded ABS engagement or reduced braking modulation
  • Possible brake system warning or reduced vehicle stability during braking

What to check

  • Retrieve stored DTCs and freeze frame data with a scan tool; note any related ABS/ESP codes
  • Visually inspect valve connector and wiring for damage, corrosion, pin deformation, or moisture
  • Check battery voltage and ground integrity at chassis and ABS ECU
  • Verify fuse(s) related to ABS/pump circuits
  • Backprobe connector at rest and during activation to check supply voltage and ground presence
  • Measure coil resistance of the FR inlet valve against service specification (compare to other valve coils if possible)

Signal parameters

  • Valve coil resistance: low-ohm range (measure and compare to service spec or matching valve)
  • Supply voltage at connector: approx. 12 V (engine off) and 13–14 V (engine running) when power present
  • Ground continuity to chassis ground from valve connector
  • Activation signal: PWM or switched supply from ABS ECU — duty cycle varies 0–100% depending on modulation
  • Activation current: valve draws moderate current when energized (measure with clamp meter)

Diagnostic algorithm

  1. Connect a capable scan tool, read and record all ABS/ESP codes and freeze frame data; check for related codes. 2) Visually inspect the FR inlet valve connector and wiring harness for damage, corrosion, or loose pins; repair as needed. 3) Check fuses and main power/ground for ABS system; verify battery/charging system voltages. 4) Backprobe the FR inlet valve connector: verify constant power (if applicable), ECU switched power/ground and continuity to chassis ground. 5) With ignition on, command the FR inlet valve ON using a scan tool (if supported) and observe connector voltages and listen/feel for valve activation. 6) Measure the coil resistance of the FR inlet valve; compare to factory specification or matching valve. An open or shorted coil indicates replacement. 7) If coil and wiring are within spec but symptoms persist, inspect brake fluid for contamination and consider bench-testing or replacing the ABS hydraulic unit. 8) If necessary, substitute a known-good valve/modulator or perform ABS control unit tests per manufacturer procedure. 9) After repairs, clear codes, perform a road test under safe conditions to confirm system operation and re-scan for codes. 10) If codes return, escalate to module-level diagnostics or replace the ABS hydraulic control assembly per service manual.

Likely causes

  • Faulty FR inlet valve solenoid (coil open/short or seized valve)
  • Corroded/loose connector at the valve harness
  • Low battery/poor ground affecting valve activation
  • Contaminated brake fluid causing valve mechanical sticking
  • Internal hydraulic control unit fault (solenoid driver or valves)

Fault status

⚠️ Status
C1226 — Front-right inlet valve circuit or valve malfunction detected in ABS hydraulic unit. ABS/ESP functions may be limited; servicing required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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