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Home / DTC / P1743 — CVT clutch system fail(A)

P1743 — CVT clutch system fail(A)

Detailed page for trouble code P1743.

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Code

P1743

MITSUBISHI P — Powertrain

CVT clutch system fail(A)

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low or contaminated CVT fluid
  • Faulty CVT clutch control solenoid(s) or valve body
  • Wiring harness damage, poor connector contact or open/short in clutch control circuit
  • Faulty TCM or software/firmware issue
  • Mechanical wear or failure of clutch pack or actuator
  • Internal hydraulic leak in transmission or worn pump reducing line pressure

Symptoms

  • MIL/Check Engine lamp illuminated
  • Transmission limp mode or reduced driveability
  • Delayed engagement or no drive from stationary
  • Excessive slipping or high engine RPM without corresponding vehicle acceleration
  • Harsh or erratic shifting, judder, or shudder during acceleration
  • Unusual transmission noises

What to check

  • Obtain full DTC list and freeze-frame data with a capable scan tool
  • Verify current and historical codes; check for related transmission codes
  • Check battery and charging system voltage (low voltage can cause solenoid/TCM faults)
  • Inspect transmission fluid level, color, smell (burnt) and contamination
  • Visually inspect wiring harness and connectors at transmission and TCM for damage, corrosion, pin push-out, water ingress
  • Check for loose or damaged transmission ground connections

Signal parameters

  • Transmission line pressure (at idle and under load) — typical operating range approx. 500–2000 kPa (72–290 psi) depending on model (compare to OEM spec)
  • Solenoid resistance (approximate) — often in range 5–50 ohms; compare to service spec
  • Solenoid command duty cycle 0–100% (0% closed, higher % = open/controlled) as reported by scan tool
  • Clutch control voltage 0–12 V (TCM command), monitor for pulsed output
  • Solenoid current draw (mA to A range depending on design) — abnormal high/low indicates short/open
  • Transmission input/output speed sensors consistent with engine RPM and vehicle speed

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool. Read and record all codes and freeze-frame data. Clear codes and perform an initial road test to re-create fault.
  2. Verify charging system and battery voltage (12.4–14.8 V range while running). Low voltage can cause false transmission faults.
  3. Check transmission fluid level, condition, and correct fluid specification. Top up or replace if low/contaminated. Replace filter/strainer if serviceable.
  4. Visually inspect transmission connectors, wiring harness and ground points for damage, corrosion, or loosened pins. Repair any faults found.
  5. Using scan tool, monitor live data for clutch command signals (duty cycle/voltage) and related pressures or sensor readings while commanding/clutch actuation. Compare to OEM expected behavior.
  6. Measure solenoid coil resistance and compare to spec. If resistance out of range or open/short, replace solenoid.
  7. Perform hydraulic pressure tests: measure line pressure and clutch apply pressure at idle and under load using a transmission pressure gauge per service procedure. Compare readings to OEM limits.
  8. If pressures are low with electrical commands present, inspect pump, internal leaks, and valve body (clean/replace as required).
  9. If electrical commands are absent or incorrect, check TCM outputs, wiring continuity to solenoid and ground. Repair short/open circuits before replacing mechanical components.
  10. If wiring and solenoids test good but problem persists, consider valve body or clutch pack mechanical inspection/rebuild. Replace faulty components following manufacturer service procedures.
  11. After repairs, clear codes and perform a complete functional/road test, including forced engagement tests and monitoring live data to confirm proper operation.
  12. Safety notes: perform tests at safe speeds, use proper supports and follow manufacturer service manual for pressure test points and procedures.

Likely causes

  • Low transmission fluid level or wrong fluid type
  • Clogged screen/strainer in hydraulic circuit reducing pressure
  • Failed pressure control solenoid for clutch A
  • Damaged connector or corroded pins at the transmission harness
  • Valve body valve sticking due to contamination or wear

Fault status

⚠️ Status
TCM detected malfunction in CVT clutch control (Clutch System Fail A). Fault stored and MIL may be illuminated; vehicle may enter limp mode. Diagnostic data such as freeze-frame and live parameters should be reviewed to isolate electrical, hydraulic, or mechanical cause.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 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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