1A-47 Engine General Information and Diagnosis:
DTC “C20” (P1752): Diff-lock Relay Circuit Malfunction
B831G21104014
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent the terminal damage or terminal bend.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-13)”.
Detected Condition Possible Cause
No voltage is applied to diff-lock motor, although ignition
switch is turned ON, or voltage is applied to diff-lock
motor, although ignition switch is turned OFF.
• Diff-lock relay circuit open or short.
• Diff-lock relay malfunction.
• ECM malfunction.
ECM
Diff-lock relay
Ignition
switch
Ignition
fuse
Main
fuse
Diff-lock relay
Transfer selecting
switch
Diff-lock
motor
O/Y
B
W/Bl
Br
W
Y/B
B/G
21
I831G1110048-02
I831G1110019-01
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