Inspection Procedure: Notes

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Hand-held tester:

READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2)

Connect the hand-held tester to the DLC3.
Turn the ignition switch to ON.
On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS #1 and ACCEL POS #2. Read the values.

Standard:

PEDAL POSITION AND VOLTAGE

Accelerator Pedal	ACCEL POS #1	ACCEL POS #2
Released	0.5 to 1.1 V	1.5 to 2.9 V
Depressed	2.5 to 4.6 V	3.5 to 5.5 V

Fig 1: Locating Pedal Position

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step 5

NG: GO TO NEXT STEP

INSPECT ACCELERATOR PEDAL ASSY (ACCELERATOR PEDAL POSITION SENSOR)

Disconnect the A25 accelerator pedal position sensor connector.

Measure the resistance between each terminal.

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
EP1 (3) - VCP1 (6)	2.25 to 4.75 kΩ at 20°C (68°F)
EP2 (1) - VCP2 (4)	2.25 to 4.75 kΩ at 20°C (68°F)

Reconnect the accelerator pedal position sensor connector.

Fig 2: Identifying Accelerator Pedal Position Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ACCELERATOR PEDAL ASSY (See REPLACEMENT )

OK: GO TO NEXT STEP

INSPECT ECM (VPA AND VPA2 VOLTAGE)
1. Turn the ignition switch to ON.
2. Measure the voltage between the specified terminals of the E6 ECM connector.
Standard:

Fig 3: Tester Connection Specified Condition Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Identifying E6 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM (See REPLACEMENT )

NG: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

Fig 5: Identifying Acceleration Pedal Position Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the A25 accelerator pedal position sensor connector.
Disconnect E6 the ECM connector.

Check the resistance between the wire harness side connectors.

Standard:

(Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VPA1 (A25-5) - VPA (E6-22)	Below 1 Ω
EP1 (A25-3) - EPA (E6-28)
VCP1 (A25-6) - VCPA (E6-26)
VPA2 (A25-2) - VPA2 (E6-23)
EP2 (A25-1) - EPA2 (E6-29)
VCP2 (A25-4) - VCP2 (E6-27)

(Check for Short)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VPA1 (A25-5) or VPA (E6-22) - Body ground	10 kΩ or higher
EP1 (A25-3) or EPA (E6-28) - Body ground
VCP1 (A25-6) or VCPA (E6-26) - Body ground
VPA2 (A25-2) or VPA2 (E6-23) - Body ground
EP2 (A25-1) or EPA2 (E6-29) - Body ground
VCP2 (A25-4) or VCP2 (E6-27) - Body ground

Reconnect the accelerator pedal position sensor connector.
Reconnect the ECM connector.

Fig 6: Identifying E6 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

REPLACE ACCELERATOR PEDAL ASSY (See REPLACEMENT )
GO: GO TO NEXT STEP

READ OUTPUT DTC (SEE IF ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN)

Clear the DTC (see DTC CHECK/CLEAR ).
Start the engine.
Run the engine at idle for 15 seconds or more.
Read the DTC (see DTC CHECK/CLEAR ).

Result:

OUT PUT RESULT

Display (DTC Output)	Proceed to
P2121	A
No output	B

B: SYSTEM OK

A: REPLACE ECM (See REPLACEMENT )