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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (HEV Control System Diagnosis (HEV)) >> DTC P1744: Transmission Engine Clutch System Performance >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
CASE 1 DTC Strategy
  • Difference between a hydraulic command and a hydraulic sensor
  1. Faulty Engine Clutch Pressure Sensor
  2. The amount of AT fluid and its operating condition
  3. Faulty Engine clutch solenoid valve
  4. Faulty AT oil pump
  5. Faulty Engine clutch control
  6. Faulty Drive Motor system
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 10V and 16V
  • HCU Ready
  • HEV Ready
  • No CAN Communication Fault
  • No break down as displayed below
    1. HCU: P0841, P0842, P0843
    2. TCU: CF_Tcu_LimMod Bit0=1, CF_Tcu_LimMod Bit2=1
  • ATF Temperature ≥ -10°C
Threshold Value
  • Hydraulic command value - hydraulic sensor value is 0.5 bar above stays for 5 seconds
Diagnosis Time
  • 5s
DTC
  • 1 Driving Cycle
MIL On Condition
  • -
Service Lamp On Condition
  • 1 Driving Cycle
  • Until IG Off, in normal condition of driving cycle
CASE 2 DTC Strategy
  • Difference between motor speed and engine speed
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 10V and 16V
  • HCU Ready
  • HEV Ready
  • No CAN Communication Fault
  • No break down as displayed below
    1. TCU: CF_Tcu_LimMod Bit0=1, CF_Tcu_LimMod Bit2=1
    2. EMS: Engine Speed Fail
    3. MCU: Motor Speed Fail
  • Control Phase = MAX Pres. or Lockup
  • ATF Temperature ≥ -10°C
Threshold value
  • Motor speed - Engine speed value is 250 RPM above stays for 5 seconds
Diagnosis Time
  • 5s
DTC
  • 1 Driving Cycle
MIL On Condition
  • -
Service Lamp ON Condition
  • 1 Driving Cycle
  • Until IG OFF, in normal condition of driving cycle
CASE 3 DTC Strategy
  • Difference between motor speed and Engine speed
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 9V and 16V
  • HCU Ready.
  • No CAN Communication Fault
  • No break down as displayed below
    1. TCU: CF_Tcu_LimMod Bit0=1, CF_Tcu_LimMod Bit2=1
    2. EMS: Engine speed fail
    3. MCU: Motor speed fail
  • Vehicle Speed ≥ 20 kph
  • PT mode = Engine Stop
  • Control Phase = Open or Release
  • ATF Temperature ≥ -10°C
Threshold value
  • Motor speed - Engine speed value is 150 RPM above stays for 5 seconds
Diagnosis Time
  • 5s
DTC
  • 1 Driving Cycle
MIL On Condition
  • -
Service Lamp ON Condition
  • 1 Driving Cycle
  • Until IG OFF, in normal condition of driving cycle
CASE 4 DTC Strategy
  • Motor speed more than certain value
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 9V and 16V
  • HCU Ready.
  • No CAN Communication Fault
  • No break down as displayed below
    1. TCU: CF_Tcu_LimMod Bit0=1, CF_Tcu_LimMod Bit2=1
    2. MCU: Motor speed fail
  • Vehicle Speed ≤ 1 kph
  • PT mode = Engine Idle
  • Gear position = P or N
  • ATF Temperature ≥ -10°C
  • Motor Torque Command = 0 Nm
Threshold Value
  • Motor speed value is 1000 RPM above stays for 5 seconds
Diagnosis Time
  • 5s
DTC
  • 1 Driving Cycle
MIL On Condition
  • -
Service Lamp ON Condition
  • 1 Driving Cycle
  • Until IG OFF, in normal condition of driving cycle