SFI SYSTEM, Diagnostic DTC:P2118

DESCRIPTION

The 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 electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system 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. On the next restart, the ECM will allow the current to flow to the throttle actuator.

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 stores the DTC.

If the malfunction is not repaired successfully, the DTC is stored 5 seconds after the engine is next started.

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the intelligent tester on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

4. Turn the ignition switch off and wait for at least 30 seconds.

5. Turn the ignition switch to ON and turn the intelligent tester on [A].

6. Start the engine.

7. Slowly depress the accelerator pedal, raise the engine speed to approximately 3000 rpm over approximately 5 seconds, and then idle the engine [B].

8. Check that 16 seconds or more have elapsed since the engine was started.

9. Enter the following menus: Powertrain / Engine and ECT / DTC [C].

10. Read the pending DTCs.

    Tech Tips

    
    

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P2118.

13. Check the DTC judgment result.

    Intelligent tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips

    
    

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again and, if necessary, drive the vehicle for a period of time.

FAIL-SAFE

When this DTC, or other DTCs relating to 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 5.5° 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 angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed 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

CAUTION / NOTICE / HINT

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (+BM VOLTAGE)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON and turn the tester on.

   3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / +BM Voltage.

   4. Read the value displayed on the tester.

      Standard Voltage
      11 to 14 V

   
   

   OK

   CHECK FOR INTERMITTENT PROBLEMS Click here

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2. CHECK HARNESS AND CONNECTOR (BATTERY - ECM, ECM - BODY GROUND)

   
   
   1. 

      Text in Illustration

      *1	for RHD
      *2	for LHD
      *a	Front view of wire harness connector (to ECM)

      Disconnect the ECM connectors.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for RHD Tester Connection Condition Specified Condition B23-29 (+BM) - Body ground Always 11 to 14 V
      for LHD Tester Connection Condition Specified Condition B22-29 (+BM) - Body ground Always 11 to 14 V

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RHD Tester Connection Condition Specified Condition B23-59 (ME01) - Body ground Always Below 1 Ω B23-16 (E1) - Body ground Always Below 1 Ω
      for LHD Tester Connection Condition Specified Condition B22-59 (ME01) - Body ground Always Below 1 Ω B22-16 (E1) - Body ground Always Below 1 Ω

   4. Reconnect the ECM connectors.

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM, ECM - BODY GROUND)