C1112 Sensor source voltage - Automotive Diagnosis

COMPONENT LOCATION

GENERAL DESCRIPTION

The HECU monitors supply voltage of each sensor for normal ESP control.

If supply voltage is out of specified range ABS/ESP warning lamps are turned on and ABS/ESP controls are inhibited.

DTC DESCRIPTION

A failure is detected if the external sensor supply voltage is out of the specified range for more than the specified min. fault duration.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Battery Voltage Monitoring

Faulty HECU

Poor connection in power supply circuit to sensor

Enable Conditions

During sensor power ON, If the voltage of sensor power is out of the specified range for 500ms.

During sensor power OFF, If the voltage of sensor power is out of the specified range for 500ms.

Fail Safe

ABS/ESP functions are inhibited, EBD function is allowed and the ABS/ESP warning lamps are activated.

DIAGNOSTIC CIRCUIT DIAGRAM

TERMINAL AND CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

3.

Has a problem been found?

	▶ Repair as necessary .
	▶ Go to “Power Circuit Inspection” procedure.

POWER CIRCUIT INSPECTION

■ Open or Short Check

1.	Ignition “ON” & Engine “OFF”.

2.

Measure voltage between power terminal of the Yaw rate & lateral G sensor harness connector and chassis ground.

Approx. 12V (Yaw rate & lateral G sensor)

3.

Is the measured value within specifications?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU
	▶ Repair open or short in power circuit between HECU harness connector and Yaw rate & lateral G sensor harness connector

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