DTC C15C7/78 DC Motor Power Source Voltage Malfunction
DTC C15C8/79 Power Supply Relay Failure
for Preparation Click here
DESCRIPTION
The steering control ECU monitors PIG (motor power source voltage) and detects a malfunction in the power supply relay (located inside the steering
control ECU).
If the steering control ECU detects a malfunction, it will turn on the master warning light, store these DTCs, and stop VGRS operation.
DTC Code DTC Detection Condition Trouble Area
C15C7/78
The steering control ECU detects that the IG terminal voltage is
between 9 and 16 V, and the PIG terminal voltage is below 7 V or
higher than 18.5 V for 2.4 seconds.
Harness or connector
Steering control ECU
C15C8/79
The steering control ECU detects a malfunction in the power source
relay or an open circuit.
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 HARNESS AND CONNECTOR (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 Condition
Specified
Condition
E82-8 (PIG) - Body
ground
Always 11 to 14 V
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