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DTC C1743/43: Height Control Main Relay Malfunction: Description

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

This relay is to supply power source to the suspension control ECU. The relay comes ON a few seconds after the ignition switch is turned ON.

DTC DETECTION CONDITION TABLE

DTC No. DTC Detection Condition Trouble Area
C1743/43 Any of the following 1., 2. or 3. detected:
  1. When the condition that the IG terminal voltage of ECU is more than 10 +/- 0.5 V and the B terminal voltage of ECU is 1.0 V or less than while the main relay is in drive condition continued for 0.5 sec.
  2. After the condition that the upper reaches voltage of the main solenoid when the main relay is ON is 2 V or less continued for 40 +/- 10 msec. and when turning the electricity 1 +1 0.1 sec. later and detecting the short circuit condition 4 times continuously.
  3. When detecting that the IG terminal voltage of ECU is 10 +/- 0.5 V or more when the main relay is not driving and the condition that the IG terminal voltage is less than the voltage added 4 V to the B terminal voltage of ECU continued for 2 secs.
  • AHC main relay
  • Suspension control ECU
  • Wire harness

Fail-safe function:

If a trouble occurs in the AHC main relay circuit, the ECU prohibits the height control and fixed the damping force at the sport mode.

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