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The ECU uses a current-driver-wraparound test to check correct operation of the torque motors, solenoid drivers and certain relays.
To check the integrity of the circuits, the ECU outputs a calculated current and compares it to the sensed return current (wraparound).
In normal operation, the output current value should be the same as the return current value.
If there is a difference between the output and return current, it must exceed a defined value for a specific time interval in order for a fault to be declared.
On a transition of channel selection state from standby to active, the ECU clears all wraparound faults and sets the fault-delay timers to zero.
 
A wrap fault is generated if :
-the difference between i1 & i2 is greater than 50mA, or
-i2 > 365mA.
Typical fault messages.
J7, HMU (VSV TM), ECU
J8, HMU (VBV TM), ECU J7, HMU (LPTCTM), ECU J7, FRV (SOL 1), ECU J7, HMU (BSVSOL), ECU HCU (TRPV), J5, ECU
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 26
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

CTC-231-030-00 CURRENT DRIVER WRAPAROUND TESTS
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 27
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

OUTPUTS
Wraparound fault detection.
Possible causes.
Example 1 : Short circuit to ground.
If there is a short circuit to ground, the current flows back to the ECU, through the ground path.
The ECU detects that i1 is not equal to i2 and generates a fault message.
Example 2 : Open circuit.
If there is an open circuit, the ECU generates a current that is unable to loop back to the ECU.
Therefore, i1 and i2 equals zero in all conditions and the ECU generates a fault message.  
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 28
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
SHORT CIRCUIT TO GROUND
TORQUE MOTOR / SOLENOID
SHORT CIRCUIT TO GROUND : i1 = i2
 

 
OPEN CIRCUIT : i1 AND i2 = 0
CTC-231-031-00 WRAPAROUND FAULT DETECTION
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 29
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

OUTPUTS
Wraparound fault detection.
　
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