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DTC P0642-00: Throttle Position Sensor Power Supply
 
 
 
 
TECHNICAL DESCRIPTION
ECM checks the throttle position sensor power voltage for abnormal conditions.
 
 
DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor source voltage is smaller than the specified value.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Check Condition
  • 12V battery positive voltage is higher than 6.3 volts.
Judgment Criterion
  • Throttle position sensor power voltage should be 4.3 volts or lower for 0.3 second.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Throttle opening degree position is in default position.
 
 
OBD-II DRIVE CYCLE PATTERN
None.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Short circuit in throttle position sensor power voltage to ground.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 90: TPS (Main)
Q: Is the check result normal?
 
2.STEP 2. Perform voltage measurement at throttle body assembly connector terminal number 5.
  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ON
  • Voltage between throttle body assembly connector terminal number 5 and ground.
OK: 4.5 to 4.9 volts.
Q: Is the check result normal?
 
3.STEP 3. Check harness between throttle body assembly connector terminal number 5 and ECM connector terminal number 32.
Check power supply line for open/short circuit.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 90: TPS (Main)
Q: Is the check result normal?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
 
5.STEP 5. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.
After erasing the DTC, check again to see if the DTC is set again.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Turn OFF the power supply mode of the electric motor switch.
(3) Turn ON the power supply mode of the electric motor switch.
(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P00642-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).