Code No. 14 Throttle Position Sensor System

OPERATION

A power voltage of 5 V is applied to the throttle position sensor (terminal No. 1) from the engine-A/T-ECU (terminal No. 46).

The power voltage is earthed to the engine-A/T-ECU (terminal No. 57) from the throttle position sensor (terminal No. 4).

The sensor signal is inputted to the engine-A/T-ECU (terminal No. 78) from the throttle position sensor output terminal (terminal No. 2).

FUNCTION

The throttle position sensor converts the opening of the throttle valve into a voltage and inputs the voltage signal to the engine-A/T-ECU.

In response to the signal, the engine-A/T-ECU checks the opening of the throttle valve.

TROUBLE JUDGMENT

Check Condition

Exclude 60 seconds after the ignition switch has been in "ON" position or just after the engine has started up.

Judgment Criteria

Sensor output voltage of 0.2 V or less for 4 seconds,

Sensor output voltage of 4.6 V or more for 4 seconds and volumetric efficiency of 40 % or less.

PROBABLE CAUSE

Failed throttle position sensor

Open/short circuit in throttle position sensor circuit or loose connector contact

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III data list

Refer to Data list reference table .

Item 14: Throttle position sensor

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Go to Step 2

STEP 2. Connector check: B-06 throttle position sensor connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Check throttle position sensor itself.

Check throttle position sensor itself (Refer to ).

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Replace throttle position sensor.

STEP 4. Perform voltage measurement at B-06 throttle position sensor connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 10

.
NO: Go to Step 5

STEP 5. Measure voltage at C-111 engine-A/T-ECU connector.

Measure engine-A/T-ECU terminal voltage.

Ignition switch: ON

Voltage between terminal No. 46 and earth.

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Go to Step 7

STEP 6. Connector check: C-111 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector.

Check power supply line for open circuit.

NO: Repair.

STEP 7. Connector check: C-111 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair.

STEP 8. Check harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector.

Check power supply line for short circuit.

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 9. MUT-II/III data list

Refer to Data list reference table .

Item 14: Throttle position sensor

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Replace engine-A/T-ECU.

STEP 10. Perform resistance measurement at B-06 throttle position sensor connector.

Disconnect connector, and measure at harness side.

Resistance between terminal No. 4 and earth.

OK: 2 Ω or less

Q: Is the check result normal?

YES: Go to Step 13

.
NO: Go to Step 11

STEP 11. Connector check: C-111 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 12

.
NO: Repair.

STEP 12. Check harness between B-06 (terminal No. 4) throttle position sensor connector and C-111 (terminal No. 57) engine-A/T-ECU connector.

Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 13. Perform voltage measurement at B-06 throttle position sensor connector.

Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 15

.
NO: Go to Step 14

STEP 14. Connector check: C-111 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector.

Check power supply line for damage.

NO: Repair.

STEP 15. Perform voltage measurement at B-06 throttle position sensor connector.

Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness.

Ignition switch: ON

Voltage between terminal No. 4 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES: Go to Step 17

.
NO: Go to Step 16

STEP 16. Connector check: C-111 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-06 (terminal No. 4) throttle position sensor connector and C-111 (terminal No. 57) engine-A/T-ECU connector.

Check earthing line for damage.

NO: Repair.

STEP 17. Perform voltage measurement at B-06 throttle position sensor connector.

Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness.

Ignition switch: ON

Voltage between terminal No. 2 and earth.

OK:

Accelerator pedal fully released: 0.536 - 0.735 V

Accelerator pedal fully depressed: 4.5 - 5.0 V

Q: Is the check result normal?

YES: Go to Step 20

.
NO: Go to Step 18

STEP 18. Adjust throttle position sensor.

Adjust throttle position sensor (Refer to ).

Q: Is the adjusted value normal?

YES: Go to Step 19

.
NO: Adjust throttle position sensor.

STEP 19. Connector check: C-110 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-06 (terminal No. 2) throttle position sensor connector and C-110 (terminal No. 78) engine-A/T-ECU connector.

Check output line for short circuit and damage.

NO: Repair.

STEP 20. Perform voltage measurement at C-110 engine-A/T-ECU connector.

Measure engine-A/T-ECU terminal voltage.

Ignition switch: ON

Voltage between terminal No. 78 and earth.

OK:

Accelerator pedal fully released: 0.536 - 0.735 V

Accelerator pedal fully depressed: 4.5 - 5.0 V

Q: Is the check result normal?

YES: Go to Step 22

.
NO: Go to Step 21

STEP 21. Connector check: C-110 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-06 (terminal No. 2) throttle position sensor connector and C-110 (terminal No. 78) engine-A/T-ECU connector.

Check output line for open circuit and damage.

NO: Repair.

STEP 22. Connector check: C-110 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.


Code No. 14 Throttle Position Sensor System

OPERATION A power voltage of 5 V is applied to the throttle position sensor (terminal No. 1) from the engine-A/T-ECU (terminal No. 46). The power voltage is earthed to the engine-A/T-ECU (terminal No. 57) from the throttle position sensor (terminal No. 4). The sensor signal is inputted to the engine-A/T-ECU (terminal No. 78) from the throttle position sensor output terminal (terminal No. 2).
FUNCTION The throttle position sensor converts the opening of the throttle valve into a voltage and inputs the voltage signal to the engine-A/T-ECU. In response to the signal, the engine-A/T-ECU checks the opening of the throttle valve.
TROUBLE JUDGMENT Check Condition Exclude 60 seconds after the ignition switch has been in "ON" position or just after the engine has started up. Judgment Criteria Sensor output voltage of 0.2 V or less for 4 seconds, or Sensor output voltage of 4.6 V or more for 4 seconds and volumetric efficiency of 40 % or less.
PROBABLE CAUSE Failed throttle position sensor Open/short circuit in throttle position sensor circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. MUT-II/III data list Refer to Data list reference table . Item 14: Throttle position sensor Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Go to Step 2 .
	STEP 2. Connector check: B-06 throttle position sensor connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Check throttle position sensor itself. Check throttle position sensor itself (Refer to ). Q: Is the check result normal? YES: Go to Step 4 . NO: Replace throttle position sensor.
	STEP 4. Perform voltage measurement at B-06 throttle position sensor connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 10 . NO: Go to Step 5 .
	STEP 5. Measure voltage at C-111 engine-A/T-ECU connector.
	Measure engine-A/T-ECU terminal voltage. Ignition switch: ON Voltage between terminal No. 46 and earth. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 7 .
	STEP 6. Connector check: C-111 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector. Check power supply line for open circuit. NO: Repair.
	STEP 7. Connector check: C-111 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.
	STEP 8. Check harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector.
	Check power supply line for short circuit. Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 9. MUT-II/III data list Refer to Data list reference table . Item 14: Throttle position sensor Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Replace engine-A/T-ECU.
	STEP 10. Perform resistance measurement at B-06 throttle position sensor connector.
	Disconnect connector, and measure at harness side. Resistance between terminal No. 4 and earth. OK: 2 Ω or less Q: Is the check result normal? YES: Go to Step 13 . NO: Go to Step 11 .
	STEP 11. Connector check: C-111 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 12 . NO: Repair.
	STEP 12. Check harness between B-06 (terminal No. 4) throttle position sensor connector and C-111 (terminal No. 57) engine-A/T-ECU connector.
	Check earthing line for open circuit and damage. Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 13. Perform voltage measurement at B-06 throttle position sensor connector.
	Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 15 . NO: Go to Step 14 .
	STEP 14. Connector check: C-111 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-06 (terminal No. 1) throttle position sensor connector and C-111 (terminal No. 46) engine-A/T-ECU connector. Check power supply line for damage. NO: Repair.
	STEP 15. Perform voltage measurement at B-06 throttle position sensor connector.
	Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness. Ignition switch: ON Voltage between terminal No. 4 and earth. OK: 0.5 V or less Q: Is the check result normal? YES: Go to Step 17 . NO: Go to Step 16 .
	STEP 16. Connector check: C-111 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-06 (terminal No. 4) throttle position sensor connector and C-111 (terminal No. 57) engine-A/T-ECU connector. Check earthing line for damage. NO: Repair.
	STEP 17. Perform voltage measurement at B-06 throttle position sensor connector.
	Use special tool test harness (MB991536) to connect connector, and measure at pick-up harness. Ignition switch: ON Voltage between terminal No. 2 and earth. OK: Accelerator pedal fully released: 0.536 - 0.735 V Accelerator pedal fully depressed: 4.5 - 5.0 V Q: Is the check result normal? YES: Go to Step 20 . NO: Go to Step 18 .
	STEP 18. Adjust throttle position sensor. Adjust throttle position sensor (Refer to ). Q: Is the adjusted value normal? YES: Go to Step 19 . NO: Adjust throttle position sensor.
	STEP 19. Connector check: C-110 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-06 (terminal No. 2) throttle position sensor connector and C-110 (terminal No. 78) engine-A/T-ECU connector. Check output line for short circuit and damage. NO: Repair.
	STEP 20. Perform voltage measurement at C-110 engine-A/T-ECU connector.
	Measure engine-A/T-ECU terminal voltage. Ignition switch: ON Voltage between terminal No. 78 and earth. OK: Accelerator pedal fully released: 0.536 - 0.735 V Accelerator pedal fully depressed: 4.5 - 5.0 V Q: Is the check result normal? YES: Go to Step 22 . NO: Go to Step 21 .
	STEP 21. Connector check: C-110 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-06 (terminal No. 2) throttle position sensor connector and C-110 (terminal No. 78) engine-A/T-ECU connector. Check output line for open circuit and damage. NO: Repair.
	STEP 22. Connector check: C-110 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.