Code No. P2121: Accelerator Pedal Position Sensor (Main) Circuit Range/Performance Problem <Vehicles except for Australia, South africa and Hong kong >

OPERATION

Refer to P2122 accelerator pedal position sensor (main) circuit .

Refer to inspection procedure 32 accelerator pedal position switch circuit .

FUNCTION

Engine-A/T-ECU checks the accelerator pedal position sensor (main) output signal characteristics for abnormal conditions.

TROUBLE JUDGMENT

Check Conditions

Ignition switch is in "ON" position

Closed accelerator pedal position switch: ON

Accelerator pedal position sensor (main) output voltage is 2.5 V or less for 1 second.

Judgment Criterion

Accelerator pedal position sensor (sub) output voltage is 1 V or higher for 1 second.

PROBABLE CAUSE

Failed accelerator pedal position sensor

Open/short circuit in accelerator pedal position sensor circuit or loose connector contact

Failed accelerator pedal position switch

Open/short circuit in accelerator pedal position switch circuit or loose connector contact

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-124 accelerator pedal position sensor connector

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Repair.

STEP 2. Check accelerator pedal position sensor itself.

Check accelerator pedal position sensor itself (Refer to ).

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Replace accelerator pedal position sensor.

STEP 3. Perform resistance measurement at B-124 accelerator pedal position sensor connector.

Disconnect connector, and measure at harness side.

Resistance between terminal No. 1 and earth.

OK: 2 Ω or less

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Go to Step 4

STEP 4. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 5

.
NO: Repair.

STEP 5. Check harness between B-124 (terminal No. 1) accelerator pedal position sensor connector and C-137 (terminal No. 91) engine-A/T-ECU connector.

Check earthing line for damage.

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Repair.

STEP 6. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES:

Replace engine-A/T-ECU.

NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Trouble shooting/Inspection Service Points

STEP 7. Check accelerator pedal position switch itself.

Check accelerator pedal position switch itself (Refer to ).

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Replace accelerator pedal position sensor.

STEP 8. Connector check: C-135 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. 4) accelerator pedal position sensor connector and C-135 (terminal No. 38) engine-A/T-ECU connector.

Check power supply line for short circuit.

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Repair.


Code No. P2121: Accelerator Pedal Position Sensor (Main) Circuit Range/Performance Problem <Vehicles except for Australia, South africa and Hong kong >

OPERATION Refer to P2122 accelerator pedal position sensor (main) circuit . Refer to inspection procedure 32 accelerator pedal position switch circuit .
FUNCTION Engine-A/T-ECU checks the accelerator pedal position sensor (main) output signal characteristics for abnormal conditions.
TROUBLE JUDGMENT Check Conditions Ignition switch is in "ON" position Closed accelerator pedal position switch: ON Accelerator pedal position sensor (main) output voltage is 2.5 V or less for 1 second. Judgment Criterion Accelerator pedal position sensor (sub) output voltage is 1 V or higher for 1 second.
PROBABLE CAUSE Failed accelerator pedal position sensor Open/short circuit in accelerator pedal position sensor circuit or loose connector contact Failed accelerator pedal position switch Open/short circuit in accelerator pedal position switch circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. Connector check: B-124 accelerator pedal position sensor connector
	Q: Is the check result normal? YES: Go to Step 2 . NO: Repair.
	STEP 2. Check accelerator pedal position sensor itself. Check accelerator pedal position sensor itself (Refer to ). Q: Is the check result normal? YES: Go to Step 3 . NO: Replace accelerator pedal position sensor.
	STEP 3. Perform resistance measurement at B-124 accelerator pedal position sensor connector.
	Disconnect connector, and measure at harness side. Resistance between terminal No. 1 and earth. OK: 2 Ω or less Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 4 .
	STEP 4. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 5 . NO: Repair.
	STEP 5. Check harness between B-124 (terminal No. 1) accelerator pedal position sensor connector and C-137 (terminal No. 91) engine-A/T-ECU connector.
	Check earthing line for damage. Q: Is the check result normal? YES: Go to Step 6 . NO: Repair.
	STEP 6. Check the trouble symptoms. Q: Does trouble symptom persist? YES: Replace engine-A/T-ECU. NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Trouble shooting/Inspection Service Points ).
	STEP 7. Check accelerator pedal position switch itself. Check accelerator pedal position switch itself (Refer to ). Q: Is the check result normal? YES: Go to Step 8 . NO: Replace accelerator pedal position sensor.
	STEP 8. Connector check: C-135 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. 4) accelerator pedal position sensor connector and C-135 (terminal No. 38) engine-A/T-ECU connector.
	Check power supply line for short circuit. Q: Is the check result normal? YES: Go to Step 6 . NO: Repair.