C1274
DTC C1274 G SENSOR - ELECTRICALComponent Location:
GENERAL DESCRIPTION
The 4WD vehicle measures the G-sensor signal to solve for 4WD vehicle unique problems. For example all 4 wheels are locked early on a low-friction road or control response is delayed when road friction coefficients vary. The HECU uses a filtered signal, as a supplementary value, to determine the road friction coefficient. This value is used for the accurate calculations of assumed vehicle speed, or precise division of control starting points.
DTC DESCRIPTION
The HECU monitors the G-sensor signal continuously, and sets this code if the abnormal G-sensor signal is detected or the deference between the value calculated from vehicle speed deviation and measured value is out of range when the vehicle isn't decelerating (brake switch is OFF).
DTC Detecting Condition:
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector(DLC)
2. Ignition "ON" & Engine "OFF".
3. Monitor the "G-sensor" parameter on the Scantool.
4. Is parameter displayed within specifications?
Yes
Fault is intermittent caused by poor connection in G-sensor harness and/or HECU's connector or was repaired and HECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
No
Go to "W/Harness Inspection" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. 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?
Yes
Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
No
Go to "Power Circuit Inspection" procedure.
POWER CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal "3" of the G-sensor harness connector and chassis ground.
3. Is the measured voltage within specifications?
Yes
Go to "Signal Circuit Inspection" procedure.
No
Check for open or short in the power harness between terminal "24" of the HECU harness connector and terminal "3" of the G-sensor harness connector. Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect G-sensor connector.
3. Measure resistance between terminal "1" of the G-sensor harness connector and terminal "23" of the HECU harness connector.
4. Is the measured resistance within specifications?
Yes
Go to "Signal Circuit inspection" procedure.
No
Check for damaged harness and poor connection between terminal "1" of the G-sensor harness connector and terminal "23" of the HECU harness connector. Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
SIGNAL CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal "21" of the HECU harness connector and chassis ground.
3. Is the measured voltage within specifications?
Yes
Fault is intermittent caused by open or short G-sensor and/or faulty G-sensor or was repaired and HECU memory was not cleared. Go to "Component Inspection" procedure.
No
Check for open or short in the G-sensor harness between terminal "2" of the G-sensor harness connector and terminal "21" of the HECU harness connector. Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal "2" of the G sensor harness connector and chassis ground.
3. Is the measured voltage within specifications?
Yes
Fault is intermittent caused by open or short G-sensor and/or faulty G-sensor or was repaired and HECU memory was not cleared. Go to "Component Inspection" procedure.
No
Substitute with a known good G-sensor and check for proper operation. If problem is corrected, replace G-sensor and then go to "Verification Of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information
4. Are any DTCs present?
Yes
Go to the applicable troubleshooting procedure.
No
System performing to specification at this time.