P2118
1NZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2118: Throttle Actuator Control Motor Current Range / Performance
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.
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, the DTC is set 5 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
* Connect the Techstream to the DLC3.
* Turn the ignition switch to ON and turn the Techstream on.
* Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
* Turn the ignition switch off and wait for at least 30 seconds.
* Turn the ignition switch to ON and turn the Techstream on [A].
* Start the engine.
* Slowly depress the accelerator pedal, raise the engine speed to approximately 3000 rpm over approximately 5 seconds, and then idle the engine [B].
* Check that 16 seconds or more have elapsed since the engine was started.
* Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
* Read pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
* Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
* Input the DTC: P2118.
* Check the DTC judgment result.
HINT
- 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.
* If no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
FAIL-SAFE
When this DTC, or 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 to OFF.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
HINT
Read freeze frame data using a Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
PROCEDURE
1. READ VALUE USING TECHSTREAM (+BM VOLTAGE)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / +BM Voltage.
(e) Read the value displayed on the Techstream.
Standard voltage:
11 to 14 V
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
(a) Check the harness and connector between the ETCS fuse and ECM.
(1) Remove the ETCS fuse from the engine room relay block.
(2) Disconnect the A21 ECM connector.
(3) Check the resistance.
Standard resistance (Check for open):
Standard resistance (Check for short):
(4) Reinstall the ETCS fuse.
(5) Reconnect the ECM connector.
(b) Check the harness and connector between the ETCS fuse and positive battery cable.
(1) Remove the ETCS fuse from the engine room relay block.
(2) Disconnect the cable from the negative battery terminal.
(3) Disconnect the cable from the positive battery terminal.
(4) Check the resistance.
Standard resistance (Check for open):
Standard resistance (Check for short):
(5) Reinstall the ETCS fuse.
(6) Reconnect the cable to the positive battery terminal.
(7) Reconnect the cable to the negative battery terminal.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM (+BM TERMINAL VOLTAGE)
(a) Disconnect the A21 and C20 ECM connectors.
(b) Measure the voltage between the terminals of the A21 and C20 ECM connectors.
Standard voltage:
(c) Reconnect the ECM connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINAL E1 AND ME01 - BODY GROUND)
OK -- REPLACE ECM Removal