Sfi System - P2118

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-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. Inspect fuse (etcs)

  11. Read value of intelligent tester (+bm voltage)

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

DTC P2118 Throttle Actuator Control Motor Current Range / Performance


​

DESCRIPTION

The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is monitored and when the voltage is low (less than 4 V), the ECM concludes that the ETCS has a fault and current to the throttle actuator is cut.
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 has returned to normal, turn the ignition switch OFF. The ECM then allows current to flow to the throttle actuator so that the engine can be restarted.
HINT:
The ETCS does not use a throttle cable.

Open in ETCS power source circuit 4Runner


DTC No.
DTC Detection Condition
Trouble Area
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 electronic throttle motor +BM. When the power supply voltage drops below the threshold, the ECM concludes that the power supply has an open circuit.
The MIL is turned on and a DTC is set.

MONITOR STRATEGY


Related DTCs
P2118: Throttle actuator power supply
Required Sensors/Components
Throttle actuator, throttle valve, ETCS fuse
Frequency of Operation
Continuous
Duration
0.8 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor will run whenever these DTCs are not present
None
Battery voltage
8 V or more
Actuator power
ON

TYPICAL MALFUNCTION THRESHOLDS


Throttle actuator power supply voltage (+BM)
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 Electronic Throttle Control System (ETCS) 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 16° 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 - P0156 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.INSPECT FUSE (ETCS)
  1. Remove the ETCS fuse from the engine room relay block. 4Runner

  2. Remove the ETCS fuse from the engine room relay block.

  1. Measure the resistance of the ETCS fuse.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the ETCS fuse.



NGnext
REPLACE FUSE
OK
next down

2.READ VALUE OF INTELLIGENT TESTER (+BM VOLTAGE)

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / +BM.

    Standard voltage:
    9 to 14 V


OKnext
CHECK FOR INTERMITTENT PROBLEMS
NG
next down

3.CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
  1. Remove the ETCS fuse from the engine room relay block. 4Runner

  2. Remove the ETCS fuse from the engine room relay block.

  1. Disconnect the E8 ECM connector.

  1. Measure the resistance of the wire harness side connector between the ETCS fuse and ECM.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Engine Room R/B (ETCS fuse terminal) - +BM (E8-7)
    		Below 1 Ω
    Engine Room R/B (ETCS fuse terminal) or +BM (E8-7) - Body ground
    		10 kΩ or higher

  1. Disconnect the battery positive terminal.

  1. Measure the resistance of the wire harness side connector between the ETCS fuse and battery.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Engine Room R/B (ECTS fuse terminal) - Battery positive terminal
    		Below 1 Ω
    Engine Room R/B (ETCS fuse terminal) or Battery positive terminal - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reinstall the ETCS fuse.



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