Alignment Specifications (02-50-005)

Publication date: 2002-04-01
Reference number: 02-50-005

SHOP MANUAL CORRECTION - G SENSOR DIAGNOSTIC TROUBLE CODE INSPECTION AND REPAIR PROCEDURE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 04-50-002, Date of Issue: May, 2004

HYUNDAI:	2001-04 Santa Fe
GROUP:	50 - CHASSIS

Superceded Bulletin(s): 02-50-013, 01-50-005

NOTE: This TSB supersedes TSB# 02-50-013 and TSB# 01-50-005 to include tone wheel inspection procedure information.

DESCRIPTION

The 2001 - 2004 Santa Fe Shop Manuals do not provide the inspection and repair procedures for the Diagnostic Trouble Codes (DTC) related to the Electronic Brake Force Distribution (EBD) "G" sensor or a cracked tone wheel. This bulletin provides that information.

"G" SENSOR LOCATION

The "G" sensor is located under the floor console under the parking brake lever.

"G" SENSOR FUNCTION

4WD Santa Fe vehicles equipped with the integrated Anti-Lock Brake System (ABS) incorporate Electronic Brake-Force Distribution (EBD) that automatically optimizes the distribution of braking force to the front and rear wheels depending upon weight transfer. The EBD calculates changes in weight during braking via the "G" sensor and electronically modulates the hydraulic pressures accordingly to prevent premature lockup of the rear wheels.

Santa Fes not equipped with ABS incorporate a conventional mechanical proportioning valve which applies braking force in a predetermined ratio to the front and rear wheels.

INSPECTION AND REPAIR PROCEDURE FOR DIAGNOSTIC TROUBLE CODES

DTCs C1274 & C1275

Fig 1: DTC Descriptions and Causes

REPAIR PROCEDURE

Inspect all four ABS speed tone wheels for a cracked tooth condition.

Fig 2: Cracked Speed Tone Wheel
Replace the affected CV shaft assembly with the ABS speed tone wheel to correct this condition.
Confirm that the "G" sensor is installed in the vehicle as shown in Fig 3 (arrow mark facing forward).

Fig 3: G Sensor Installed
Measure the standard voltage values with the ignition switch "ON".

Fig 4: G Sensor Standard Voltage Values
Measure the standard resistance value between terminals 1 and 2 with the ignition switch OFF.
If any of the measured values is outside the standard values, and if there is no abnormality in power supply and ground wires, replace the "G" sensor.
NOTE:
- Install the "G" sensor in the vehicle position (arrow on the sensor pointing forward).
- Do not drop the "G" sensor or subject it to shock at any time.
With the ignition switch ON, measure the output voltage between the HECU connector 13 and ground.
If the measured value is not 2.5V, check and repair connectors E13, EM05 and M53 as necessary (refer to the attached ABS schematic diagrams in Fig 5 , Fig 6 , & Fig 7 ).
Check trouble symptoms (DTCs).
If any of the DTCs are present, replace the HECU.

SCHEMATIC DIAGRAM

SCHEMATIC DIAGRAM: ABS CIRCUIT (1)

Fig 5: ABS Circuit (1)

SCHEMATIC DIAGRAM: ABS CIRCUIT (2)

Fig 6: ABS Circuit (2)

SCHEMATIC DIAGRAM: ABS CIRCUIT (3)

Fig 7: ABS Circuit (3)