C1503

DTC C1503





GENERAL DESCRIPTION
Driver can inhibit the ESC control by ESC switch. When switch signal send into HECU, ESC warning lamp go ON and ESC control is stopped and if next switch signal is inputted again, ESC control is ready. This function is used for sporty driving or vehicle inspection.

DTC DESCRIPTION
Trouble code is set when the condition that the level of ESC switch is high is continued for 60sec. When the ESC switch failure is set there is no signal in the warning lamp and allow the ABS/EBD control.

DTC DETECTING CONDITION:

TERMINAL & 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 SUPPLY CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF" & ESC Switch "ON".
2. Measure voltage between terminal "31" of the HECU harness connector and chassis ground.
Specification: Approx B+





3. Is the measured voltage within specifications?
YES
Fault is intermittent caused by open or short in ESC switch line, faulty ESC switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
Check for damaged harness and poor connection in the power harness between the battery terminal (+) and the terminal "31" of the HECU harness connector. Check for open or blown 10 A fuse referring to "Circuit Diagram". Repair as necessary and then go to "Verification of vehicle Repair" procedure.

COMPONENT INSPECTION
1. Ignition "ON".
2. Disconnect ESC switch connector.
3. Press the ESC switch.
4. Measure resistance between terminal "3" of the ESC switch harness connector and terminal "4" of the ESC switch harness connector.
Specification: Approx. below 1





5. Is the measured resistance within specifications?
YES
Fault is intermittent caused by faulty ESC switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
Substitute with a known-good ESC switch and check for proper operation. If problem is corrected, replace ESC switch 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.