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DTC P0703: Malfunction of Stoplight Switch
 
 
 
 
DIAGNOSTIC FUNCTION
TCM detects malfunction using the stoplight switch signal sent from the ETACS-ECU.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • Drive the vehicle at 30 km/h (19 mph) or more for 10 seconds, and then turn the ignition switch to the "LOCK" (OFF) position. In this sequential operation, no variation has been found in the stoplight switch input signal in two consecutive times.
 
 
DTC SET CONDITIONS
Check Conditions
  • Vehicle speed: 30 km/h (19 mph) or more.
Judgment Criteria
  • The change of stoplight switch signal during driving cycle: no occurrence (10 seconds × 2 times).
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus
  • Malfunction of the stoplight switch
  • Damaged wiring harness and connectors
  • Malfunction of TCM
  • Malfunction of ETACS-ECU
 
 
DIAGNOSIS
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting - Diagnostic Trouble Code Chart ).
 
STEP 2. M.U.T.-III data list
Item 62: Brake switch
OK: The service data changes in response to the brake operation.
Is the check result normal?
Go to Step 3.
Refer to GROUP 54A - ETACS, Input Signal Procedures - The stoplight switch signal is not received .
 
STEP 3. Symptom recheck after erasing diagnostic trouble code
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions .).
Replace TCM.