Lexus LX - DTC C15 C6;77 IG Power Supply Voltage Malfunction

DTC C15C6/77 IG Power Supply Voltage Malfunction
for Preparation Click here
DESCRIPTION
The steering control ECU monitors the IG power supply voltage.
If the steering control ECU detects a malfunction, it will turn on the master warning light, store DTC C15C6/77, and stop VGRS operation.
DTC Code DTC Detection Condition Trouble Area
C15C6/77
The steering control ECU detects that the battery voltage is normal and
the IG terminal voltage is below 4 V for 6 seconds.
Harness or connector
Steering control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.
1.CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)
a. Record and clear the DTCs ( Click here).
b. Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
Tester Connection Condition
Specified
Condition
E82-7 (PGND) - Body
ground
Always Below 1 Ω
E83-8 (PGD2) - Body
ground
Standard Voltage:
Tester Connection Switch Condition
Specified
Condition
E82-3 (IG) - Body
ground
Engine switch on
(IG)
11 to 14 V
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2.RECONFIRM DTC OUTPUT