Code
C1236
MITSUBISHI
C — Chassis
FL inlet valve
Views:
UK: 10
EN: 17
RU: 14
AI status
Completed
Completed
100%
Causes
- Defective FL inlet solenoid (coil open/short or internal failure)
- Open or short in wiring harness to FL inlet valve
- Corroded/loose connector or poor ground at the valve or ABS module
- Blown fuse or loss of power to ABS hydraulic unit
- Contaminated brake fluid or debris restricting valve operation
- Faulty ABS hydraulic unit (internal valve or driver electronics)
Symptoms
- ABS warning lamp illuminated and fault stored
- ABS/traction control functionality reduced or disabled
- Possible brake pedal pulsation during ABS events
- Brake system warning lamp may also illuminate on some models
- No obvious mechanical brake failure at low speed but loss of ABS operation
What to check
- Read ABS module freeze frame and full trouble code list with a capable scan tool
- Visually inspect wiring and connector at the front-left inlet valve and ABS unit for damage, corrosion, or loose pins
- Check ABS-related fuses and battery supply/ground to ABS module
- Measure resistance of the FL inlet solenoid at the valve connector (compare to service spec)
- Backprobe while actuating valve with scan tool to verify voltage and control signal
- Check for contamination in brake fluid and signs of hydraulic leakage
Signal parameters
- Typical solenoid coil resistance varies by model — consult service manual (commonly low ohms, e.g. single-digit to tens of ohms)
- Activation voltage: approx. battery voltage (~12 V) at the valve connector during actuation (may be switched/pulsed)
- Control signal: driven by ABS module (may be pulsed/duty-cycle) — monitor with scope or capable scan tool
- Watch for high current draw when activated (indicative of shorted coil) or open circuit (infinite resistance)
Diagnostic algorithm
- Connect OEM-capable scan tool; record freeze frame and erase codes, then attempt to re-create code
- Perform visual inspection of FL valve connector, wiring harness, and ABS unit for damage or corrosion
- Check fuses and measure battery voltage at ABS module harness ground and power pins
- Disconnect FL inlet valve connector and measure coil resistance; compare to factory specification
- Backprobe the valve connector, command valve ON via scan tool, and verify controller output voltage and any pulse pattern while observing coil current
- If valve coil is within spec but no drive from ABS module, inspect module grounds and power; consider module driver failure
- If wiring and module outputs are OK but valve does not operate, replace FL inlet valve or ABS hydraulic assembly per service instructions
- After repair, clear codes, perform ABS actuator tests if available, and road-test to confirm no return of C1236
Likely causes
- Failed FL inlet solenoid
- Damaged or corroded connector/wiring to the FL inlet valve
- Internal failure in ABS hydraulic unit (valve driver)
Fault status
Status
ABS fault: Front Left inlet valve electrical/function fault detected. ABS control of the FL wheel may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
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