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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 P1A77: Check Generator Belt >> 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
  • Comparing Generator (HSG) RPM and Engine RPM
  1. Belt cut.
  2. Lack of Belt Tension
  3. Abnormal Belt installation
  4. Contamination of Belt (Water, foreign material etc.)
  5. Faulty Belt
  6. Faulty Generator (HSG)
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 10V and 16V
  • HCU Ready.
  • No CAN Communication Fault
  • MCU/HSG Controllable
Threshold Value
  • If ABS (Engine RPM - HSG RPM/Pulley Ration) ≥ 1000, then Calculates Σ ABS (Engine RPM - HSG RPM/Pulley Ratio)
  • In case that Σ ABS (Engine RPM - HSG RPM/Pulley Ratio) ≥ 200000 with ten times.
Diagnosis Time
  • -
DTC
  • 2 Driving Cycle
MIL On Condition
  • 2 Driving Cycle
Service Lamp On Condition
  • 1 Driving Cycle
CASE 2 DTC Strategy
  • Comparing Generator (HSG) RPM and Engine RPM
Enable Conditions
  • Ignition Key "ON"
  • Aux, Battery Voltage is between 10V and 16V
  • HCU Ready.
  • No CAN Communication Fault
  • MCU/HSG Controllable
Threshold value
  • ABS (Engine RPM - Hsg RPM/Pulley Ratio) ≥ 300 and Engine RPM ≤ 500
Diagnosis Time
  • 8s
DTC
  • 2 Driving Cycle
MIL On Condition
  • 2 Driving Cycle
Service Lamp On Condition
  • 1 Driving Cycle
CASE 3 DTC Strategy
  • Comparing Generator (HSG) RPM and Engine RPM
Enable Conditions
  • Ignition Key "ON"
  • Battery voltage is between 9V and 16V
  • HCU Ready.
  • No CAN Communication Fault
  • MCU/HSG Controllable
Threshold Value
  • ABS (Engine RPM - Hsg RPM/Pulley Ratio) ≥ 950
Diagnosis Time
  • 8s
DTC
  • 2 Driving Cycle
MIL On Condition
  • 2 Driving Cycle
Service Lamp On Condition
  • 1 Driving Cycle