Daewoo MUSSO Service Manual page 1234

Error in electro - magnetic clutch : fault code
"1721", "1722"
Phenomenon
1. Upon diagnosis by SCAN-100, it displays on fault
codes "1721,1722".
Cause
1. Defect in electro - magnetic clutch
2. Defect in connector or wiring
- Open or short from EMC to the supply : 1721
- Short EMC to ground : 1722
Stage
Check relevant connector connection status.
1. Check relevant connector connection status with TOD
control unit.
- Does it connect correctly ?
2. Check connection status of speed sensor and clutch
coil connector (7 pin) in transfer case.
- Does it connect correctly ?
C1
3. In case of bad connection, connect it correctly then
perform the follows :
a. Delete the memorized fault code in control unit with
Scan - 100.
b. Ignition "OFF".
c. Ignition "ON".
d. Diagnose by SCAN-100
- Does it display on fault codes "1721,1722" ?
Check supply voltage into electro-magnetic clutch.
1. Ignition "ON"
2. Measure voltage between pin 4/19(+) and 17/18(-) in
TOD control unit connector.
- Specified value
- Measured value is within specified range ?
3. If the specified value would not be measured, perform
C2
the follows :
a. Check battery voltage (charging condition)
b. Check open circuit on No.13 fuse (20A)
c. Check relevant wires.
- Is the above 3a, 3b, 3c normal ?
Test Stage / Contents
Test Contents and Procedure
TRANSFER CASE (TOD) 5D2-25
Result
Countermeasure
Specified Value
/Yes/No
Yes Perform C1-2 stage
No Perform C1-3 stage
Yes Perform C2 stage
No Perform C1-3 stage
Yes Perform C2 stage
No Normal system
11-15Vdc
Yes Perform C3 stage
No Perform C2-3 stage
Yes Perform C3 stage
No Charging/
Replace battery
Replace fuse
Repair wires