Code No. P2122: Accelerator Pedal Position Sensor (Main) Circuit Low Input

OPERATION

A power voltage of 5 V is applied to the accelerator pedal position sensor (terminal No. 2) from the engine-A/T-ECU (terminal No. 92).

The power voltage is earthed to the engine-A/T-ECU (terminal No. 91) from the accelerator pedal position sensor (terminal No. 1).

The sensor signal is inputted to the engine-A/T-ECU (terminal No. 114) from the accelerator pedal position sensor output terminal (terminal No. 3).

FUNCTION

The accelerator pedal position sensor (main) outputs voltage which corresponds to the accelerator pedal depression.

The engine-A/T-ECU checks whether the voltage is within a specified range.

TROUBLE JUDGMENT

Check Condition

Ignition switch is in "ON" position.

Judgment Criteria

Accelerator pedal position sensor (main) output voltage is 0.2 volt or less for 0.3 second.

Accelerator pedal position sensor (main) output voltage is 0.2 volt or less for 1 second. <Vehicles for Australia and South africa>

Accelerator pedal position sensor (main) output voltage is 0.6 volt or less for 0.3 second. <Vehicles except for Australia and South africa>

PROBABLE CAUSE

Failed accelerator pedal position sensor

Open/short circuit in accelerator pedal 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 78: Accelerator pedal position sensor (main)

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-124 <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Check accelerator pedal position sensor itself.

Check accelerator pedal position sensor itself (Refer to ).

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Replace accelerator pedal position sensor.

STEP 4. Perform voltage measurement at B-124 <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 2 and earth. <Vehicles except for Australia, South africa and Hong kong>

Voltage between terminal No. 1. <Vehicles for Australia, South africa and Hong kong>

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Go to Step 5

STEP 5. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Repair.

STEP 6. Check harness between B-124 (terminal No. 2) <Vehicles except for Australia, South africa and Hong kong> or C-41 (terminal No. 1) <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 92) engine-A/T-ECU connector.

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Repair.

STEP 7. MUT-II/III data list

Refer to Data List Reference Table .

Item 78: Accelerator pedal position sensor (main)

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 8. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 9. Check harness between B-124 (terminal No. 2) <Vehicles except for Australia, South africa and Hong kong> or C-41 (terminal No. 1) <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 92) engine-A/T-ECU connector.

Check power supply line for damage.

Q: Is the check result normal?

YES: Go to Step 10

.
NO: Repair.

STEP 10. Check harness between B-124 (terminal No.3) <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 114) engine-A/T-ECU connector.

Check earthing line for damage.

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Repair.


Code No. P2122: Accelerator Pedal Position Sensor (Main) Circuit Low Input

OPERATION A power voltage of 5 V is applied to the accelerator pedal position sensor (terminal No. 2) from the engine-A/T-ECU (terminal No. 92). The power voltage is earthed to the engine-A/T-ECU (terminal No. 91) from the accelerator pedal position sensor (terminal No. 1). The sensor signal is inputted to the engine-A/T-ECU (terminal No. 114) from the accelerator pedal position sensor output terminal (terminal No. 3).
FUNCTION The accelerator pedal position sensor (main) outputs voltage which corresponds to the accelerator pedal depression. The engine-A/T-ECU checks whether the voltage is within a specified range.
TROUBLE JUDGMENT Check Condition Ignition switch is in "ON" position. Judgment Criteria Accelerator pedal position sensor (main) output voltage is 0.2 volt or less for 0.3 second. Accelerator pedal position sensor (main) output voltage is 0.2 volt or less for 1 second. <Vehicles for Australia and South africa> Accelerator pedal position sensor (main) output voltage is 0.6 volt or less for 0.3 second. <Vehicles except for Australia and South africa>
PROBABLE CAUSE Failed accelerator pedal position sensor Open/short circuit in accelerator pedal 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 78: Accelerator pedal position sensor (main) 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-124 <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Check accelerator pedal position sensor itself. Check accelerator pedal position sensor itself (Refer to ). Q: Is the check result normal? YES: Go to Step 4 . NO: Replace accelerator pedal position sensor.
	STEP 4. Perform voltage measurement at B-124 <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 2 and earth. <Vehicles except for Australia, South africa and Hong kong> Voltage between terminal No. 1. <Vehicles for Australia, South africa and Hong kong> OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 5 .
	STEP 5. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 6 . NO: Repair.
	STEP 6. Check harness between B-124 (terminal No. 2) <Vehicles except for Australia, South africa and Hong kong> or C-41 (terminal No. 1) <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 92) engine-A/T-ECU connector.
	Q: Is the check result normal? YES: Go to Step 7 . NO: Repair.
	STEP 7. MUT-II/III data list Refer to Data List Reference Table . Item 78: Accelerator pedal position sensor (main) 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 8. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 9. Check harness between B-124 (terminal No. 2) <Vehicles except for Australia, South africa and Hong kong> or C-41 (terminal No. 1) <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 92) engine-A/T-ECU connector.
	Check power supply line for damage. Q: Is the check result normal? YES: Go to Step 10 . NO: Repair.
	STEP 10. Check harness between B-124 (terminal No.3) <Vehicles except for Australia, South africa and Hong kong> or C-41 <Vehicles for Australia, South africa and Hong kong> accelerator pedal position sensor connector and C-137 (terminal No. 114) engine-A/T-ECU connector.
	Check earthing line for damage. Q: Is the check result normal? YES: Go to Step 7 . NO: Repair.