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Last Modified: 11-27-2007 1.6 C
Service Category: Steering Section: Steering Column
Model Year: 2008 Model: LX570 Doc ID: RM000000YUD00JX
Title: VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DESCRIPTION (2008 LX570)

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

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

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

PROCEDURE

1.

CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)

(a) Record and clear the DTCs VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(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
OK

2.

RECONFIRM DTC OUTPUT

(a) Check for DTCs VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

Result

Result

Proceed to

C15C6/77 is not output

A

C15C6/77 is output

B
A