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VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15C6/77

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DTC Code DTC Name
C15C6/77 IG Power Supply Voltage Malfunction
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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
Table 1. *a from IG Circuit *b ECU-IG No. 4 *c Steering Control ECU
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.

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PROCEDURE


  1. Click here

    CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)


    1. Record and clear the DTCs (Click here).

    2. A01X5L6E02
      Table 2.
      *a Component with harness connected: (Steering Control ECU)

      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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    RECONFIRM DTC OUTPUT


    1. Check for DTCs (Click here).

      Table 3. Result
      Result Proceed to
      C15C6/77 is not output A
      C15C6/77 is output (for LHD) B
      C15C6/77 is output (for RHD) C