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. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Component operating range

  7. Fail-safe

  8. Wiring diagram

  9. Inspection procedure

  10. Check fuse (etcs fuse)

  11. Inspect ecm (+bm voltage)

  12. Check harness and connector (ecm - etcs fuse, etcs fuse - battery)

DTC P2118 Throttle Actuator Control Motor Current Range / Performance


​

DESCRIPTION

The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the ignition switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
HINT:
The ETCS does not use a throttle cable.

Open in ETCS power source circuit 4Runner


DTC No.
DTC Detection Conditions
Trouble Areas
P2118
Open in ETCS power source (+BM) circuit (1 trip detection logic)
  1. Open in ETCS power source circuit
  2. ETCS fuse
  3. ECM

MONITOR DESCRIPTION

The ECM monitors the battery supply voltage applied to the throttle actuator.
When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC.
If the malfunction is not repaired successfully, a DTC is set 5 seconds after the engine is next started.

MONITOR STRATEGY


Related DTCs
P2118: Throttle actuator motor power supply line range check (Low voltage)
Required Sensors / Components (Main)
Throttle actuator, throttle valve, ETCS fuse
Required Sensors / Components (Related)
-
Frequency of Operation
Continuous
Duration
0.8 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever these DTCs are not present
None
Actuator power
ON
Battery voltage
More than 8 V

TYPICAL MALFUNCTION THRESHOLDS


Throttle actuator power supply voltage
Less than 4 V

COMPONENT OPERATING RANGE


Throttle actuator power supply voltage
9 to 14 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 depressed firmly and gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM


Sfi System - P0125 4Runner


INSPECTION PROCEDURE

HINT:
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.CHECK FUSE (ETCS FUSE)
  1. Remove the ETCS fuse from the engine room R/B. 4Runner

  2. Remove the ETCS fuse from the engine room R/B.

  1. Check the ETCS fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the ETCS fuse.



NGnext
CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK
next down

2.INSPECT ECM (+BM VOLTAGE)
  1. Measure the voltage between the terminals of the E6 and E8 ECM connectors.Standard voltage:Tester ConnectionsSpecified Conditions+BM (E8-7) - E1 (E6-1)9 to 14 V 4Runner

  2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    +BM (E8-7) - E1 (E6-1)
    		9 to 14 V


OKnext
CHECK FOR INTERMITTENT PROBLEMS
NG
next down

3.CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
  1. Check the harness and connector between the ETCS fuse and ECM.Remove the ETCS fuse from the engine room R/B.Disconnect the E8 ECM connector.Check the resistance.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsETCS fuse (2) - +BM (E8-7)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsETCS fuse (2) or +BM (E8-7) - Body ground10 kΩ or higherReconnect the ECM connector. 4Runner

  2. Check the harness and connector between the ETCS fuse and ECM.

    1. Remove the ETCS fuse from the engine room R/B.

    2. Disconnect the E8 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      ETCS fuse (2) - +BM (E8-7)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      ETCS fuse (2) or +BM (E8-7) - Body ground
      		10 kΩ or higher

    4. Reconnect the ECM connector.

  1. Check the harness and connector between the ETCS fuse and positive battery cable.

    1. Disconnect the negative battery cable.

    2. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Positive battery cable - ETCS fuse (1)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Positive battery cable or ETCS fuse (1) - Body ground
      		10 kΩ or higher

    3. Reinstall the ETCS fuse.

    4. Reconnect the negative battery cable.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM