Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Fail-safe

  4. Monitor strategy

  5. Typical enabling conditions

  6. Typical malfunction thresholds

  7. Component operating range

  8. Fail-safe

  9. Wiring diagram

  10. Inspection procedure

  11. Read value of intelligent tester (throttle pos and throttle pos #2)

  12. Check harness and connector (throttle position sensor - ecm)

  13. Inspect ecm (vc voltage)

  14. Replace throttle with motor body assembly

  15. Check whether dtc output recurs (throttle position sensor dtcs)

DTC P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit

DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input

DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input

DTC P0220 Throttle / Pedal Position Sensor / Switch "B" Circuit

DTC P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input

DTC P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

DTC P2135 Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

HINT:
These DTCs relate to the Throttle Position (TP) sensor.

DESCRIPTION

HINT:
This ETCS (Electronic Throttle Control System) does not use a throttle cable. The Throttle Position (TP) sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is a non-contact type, and uses Hall-effect elements, in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as well as very low speeds.
The TP sensor has two sensor circuits which each transmit a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals of the ECM.
As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air-fuel ratio correction, power increase correction and fuel-cut control.

Throttle Position (TP) sensor (built into throttle body) 4Runner


DTC No.
DTC Detection Conditions
Trouble Areas
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)
  1. Throttle Position (TP) sensor (built into throttle body)
  2. ECM
P0122
Output voltage of VTA1 is 0.2 V or less for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. ECM
P0123
Output voltage of VTA1 is 4.8 V or more for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Open in VTA1 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA1 circuits
  5. ECM
P0220
Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. ECM
P0222
Output voltage of VTA2 is 1.75 V or less for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. ECM
P0223
Output voltage of VTA2 is 4.8 V or more, and VTA1 is between 0.2 V and 2.02 V, for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuits
  5. ECM
P2135
Either condition (a) or (b) met (1 trip detection logic):
(a) Difference between output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more
(b) Output voltage of VTA1 is 0.2 V or less, and VTA2 is 1.75 V or less, for 0.4 seconds or more
  1. Short between VTA1 and VTA2 circuits
  2. TP sensor (built into throttle body)
  3. ECM
HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS AND THROTTLE POS #2.
  2. THROTTLE POS denotes the VTA1 signal (expressed in percentages), and THROTTLE POS #2 denotes the VTA2 signal (expressed in voltages).

Reference (Normal Condition):

Tester Display
Accelerator Pedal Fully Released
Accelerator Pedal Fully Depressed
THROTTLE POS
10 to 24%
64 to 96%
THROTTLE POS #2
2.1 to 3.1 V
4.5 to 5.0 V

MONITOR DESCRIPTION

The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the TP sensor.
  1. A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
  2. VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
  3. VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor, and sets a DTC.
If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.

FAIL-SAFE

If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimal speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the ignition switch is turned to OFF, the fail-safe operation will stop and the system will return to normal condition.

MONITOR STRATEGY


Related DTCs
P0120: Throttle position sensor 1 range check (Fluctuating)
P0122: Throttle position sensor 1 range check (Low voltage)
P0123: Throttle position sensor 1 range check (High voltage)
P0220: Throttle position sensor 2 range check (Fluctuating)
P0222: Throttle position sensor 2 range check (Low voltage)
P0223: Throttle position sensor 2 range check (High voltage)
P2135: Throttle position sensor range check (Correlation)
Required Sensors / Components (Main)
Throttle position sensor
Required Sensors / Components (Related)
-
Frequency of Operation
Continuous
Duration
Accelerator pedal ON: 2 seconds
Accelerator pedal OFF: 10 seconds
P2135: 0.5 seconds or 0.4 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever these DTCs are not present
None
Ignition switch
ON
Throttle control motor power
ON

TYPICAL MALFUNCTION THRESHOLDS


P0120:
VTA1 voltage
0.2 V or less, or 4.535 V or more

P0122:
VTA1 voltage
0.2 V or less

P0123:
VTA1 voltage
4.8 V or more

P0220:
VTA2 voltage
1.75 V or less, or 4.8 V or more

P0222:
VTA2 voltage
1.75 V or less

P0223:
Both of the following conditions are met for 2 seconds or more:
Condition 1 and 2
1. VTA1 voltage
0.2 to 2.02 V
2. VTA2 voltage
4.8 V or more

P2135:
Either of the following conditions is met:
Condition 1 or 2
1. Difference between VTA1 and VTA2 voltage
0.02 V or less
2. Both of the following conditions are met:
Condition (a) and (b)
(a) VTA1 voltage
0.2 V or less
(b) VTA2 voltage
1.75 V or less

COMPONENT OPERATING RANGE


VTA1 voltage
0.69 to 3.96 V
VTA2 voltage
2.25 to 5.0 V

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is fully depressed slowly, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned to OFF.

WIRING DIAGRAM


If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit. 4Runner


INSPECTION PROCEDURE

HINT:
  1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.READ VALUE OF INTELLIGENT TESTER (THROTTLE POS AND THROTTLE POS #2)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the intelligent tester on.

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS and THROTTLE POS #2.

  1. Check the values displayed on the tester.

    Result:

    TP#1 (VTA1)
    When AP Released
    		TP#2 (VTA2)
    When AP Released
    		TP#1 (VTA1)
    When AP Depressed
    		TP#2 (VTA2)
    When AP Depressed
    		Trouble Areas
    		Proceed to
    0%
    		Between 0 V and 0.2 V
    		0%
    		Between 0 V and 0.2 V
    		VC circuit open
    		A
    100%
    		Between 4.5 V and 5.0 V
    		100 %
    		Between 4.5 V and 5.0 V
    		E2 circuit open
    		A
    0% or 100%
    		Between 2.1 V and 3.1 V
    (Fail-safe)
    		0% or 100%
    		Between 2.1 V and 3.1 V
    (Fail-safe)
    		VTA1 circuit open or ground short
    		A
    Approx. 19%
    (Fail-safe)
    		Between 0 V and 0.2 V, or 4.5 V and 5.0 V
    		Between 10% and 24%
    (Fail-safe)
    		Between 0 V and 0.2 V, or 4.5 V and 5.0 V
    		VTA2 circuit open or ground short
    		A
    Between 10% and 24%
    		Between 2.1 V and 3.1 V
    		Between 64% and 96%
    (Not fail-safe)
    		Between 4.5 V and 5.0 V
    (Not fail-safe)
    		TP sensor circuit normal
    		B
    HINT:
    1. TP#1 denotes THROTTLE POS, and TP#2 denotes THROTTLE POS#2.
    2. AP denotes Accelerator Pedal.
    3. VTA1 is expressed as percentage, and VTA2 is expressed as voltage.


Bnext
Go to step 5
A
next down

2.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
  1. Disconnect the T2 throttle with motor body connector. 4Runner

  2. Disconnect the T2 throttle with motor body connector.

  1. Disconnect the E4 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    VC (T2-5) - VC (E4-23)
    		Below 1 Ω
    VTA1 (T2-6) - VTA1 (E4-20)
    		Below 1 Ω
    VTA2 (T2-4) - VTA2 (E4-19)
    		Below 1 Ω
    E2 (T2-3) - E2 (E4-28)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    VC (T2-5) or VC (E4-23) - Body ground
    		10 kΩ or higher
    VTA1 (T2-6) or VTA1 (E4-20) - Body ground
    		10 kΩ or higher
    VTA2 (T2-4) or VTA2 (E4-19) - Body ground
    		10 kΩ or higher

  1. Reconnect the throttle with motor body connector.

  1. Reconnect the ECM connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

3.INSPECT ECM (VC VOLTAGE)
  1. Disconnect the T2 throttle with motor body connector. 4Runner

  2. Disconnect the T2 throttle with motor body connector.

  1. Turn the ignition switch on.

  1. Measure the voltage between the terminals of the E4 ECM connector.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    VC (T2-23) - E2 (E4-28)
    		4.5 to 5.0 V

  1. Reconnect the throttle with motor body connector.



NGnext
REPLACE ECM
OK
next down

4.REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY

  1. Replace the throttle with motor body assembly (Click here).


NEXT
next down

5.CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the tester on.

  1. Clear DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds or more.

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. Read DTCs.

    Result:

    Display (DTC Output)
    		Proceed to
    P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135
    		A
    No output
    		B


Bnext
SYSTEM OK
A
next down
REPLACE ECM