1A
DTC P0123: Throttle Position Sensor Circuit High
Wiring Diagram
1. TP sensor 2. To MAP sensor 3. To other sensors 4. ECM
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Voltage of TP sensor output is more than the specified value for 0.5 seconds continuously.
(1 driving cycle detection logic)
• TP sensor circuit
• TP sensor
• MAP sensor
• ECM
NOTE:
When DTC P0108, P0113 and P0118 are indicated together, it is possible that “BLK/BLU” wire circuit is open.
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec. or more.
4) Check DTC and pending DTC.
DTC Troubleshooting
Step Action YES NO
1
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Go to Engine and Emission Control System Check:M13A with VVT .
2
TP sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned OFF and then turn ignition switch ON.
2) Check throttle valve opening percentage displayed on scan tool.
3) Check throttle valve opening percentage displayed on scan tool while opening throttle valve from idle position to full open position.
Is it displayed 100%?
Go to Step 3.
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
3
Wire harness check
1) Disconnect connector from TP sensor with ignition switch turned OFF.
2) Check for proper connection to TP sensor at “LT GRN/RED”, “LT GRN” and “BLK/BLU” wire terminals.
3) If OK, then with ignition switch turned ON, check for the following terminal voltages.
• Between “LT GRN/RED” wire terminal of TP sensor connector and body ground
• Between “LT GRN” wire terminal of TP sensor connector and body ground
Is each terminal voltage about 4 – 6 V?
Go to Step 8.
Go to Step 4.
4
Was “LT GRN/RED” wire terminal voltage in Step 3 within specification?
Go to Step 6.
Go to Step 5.
5
Wire circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Check for proper connection of ECM connector at “E119-8” terminal.
4) Turn ignition switch to ON position.
5) Measure voltage between “LT GRN/RED” wire terminal of TP sensor connector and body ground.
Is terminal voltage about 0 V?
Substitute a known-good ECM and recheck.
“LT GRN/RED” wire shorted to power circuit.
6
Wire circuit check
1) Disconnect connector from ECM with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Check for proper connection of ECM connector at “E119-34” terminal.
4) Measure voltage between “LT GRN” wire terminal of TP sensor connector and body ground.
Is voltage about 0 V at terminal?
Go to Step 7.
“LT GRN” wire shorted to power circuit. If wire is OK, substitute a known-good ECM and recheck.
7
Wire circuit check
1) Measure resistance between “E119-34” wire terminal of ECM connector and “LT GRN” wire terminal of TP sensor connector with ignition switch turned OFF.
Is resistance below 5 Ω?
Go to Step 8.
“LT GRN” wire open or high resistance circuit.
8
Ground circuit check
1) Connect connector to ECM.
2) Measure resistance between “BLK/BLU” wire terminal of TP sensor connector and body ground with ignition switch turned OFF.
Is resistance below 5 Ω?
Go to Step 10.
Go to Step 9.
9
Ground circuit check
1) Measure resistance between “E119-28” terminal of ECM connector and body ground.
Is resistance below 5 Ω?
“BLK/BLU” wire open circuit or high resistance circuit. Poor “E119-28” connection.
Faulty ECM ground circuit. If circuit are OK, substitute a known-good ECM and recheck.
10
TP sensor check
1) Measure resistance between terminals of TP sensor referring to Throttle Position (TP) Sensor On-Vehicle Inspection:M13A .
Are measured values within specifications?
Substitute a known-good ECM and recheck.
Replace TP sensor.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.