DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)
RECONFIRM DTC OUTPUT
DTC C15C6/77 IG Power Supply Voltage Malfunction
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
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WIRING DIAGRAM
INSPECTION PROCEDURE
- The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.
| 1.CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT) |
Record and clear the DTCs ().
Measure the resistance and voltage according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E77-7 (PGND) - Body ground | Always | Below 1 Ω |
| E78-8 (PGD2) - Body ground |
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E77-3 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Check for DTCs ().
Result| Result | Proceed to |
| C15C6/77 is not output | A |
| C15C6/77 is output (for LHD) | B |
| C15C6/77 is output (for RHD) | C |
| | REPLACE STEERING CONTROL ECU ()
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| | REPLACE STEERING CONTROL ECU ()
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| A | |
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| USE SIMULATION METHOD TO CHECK ()
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