DESCRIPTION
The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body with motor assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
---|---|---|---|---|---|
P211172 | Throttle Actuator "A" Control System Actuator Stuck Open | The ECM signals the throttle actuator to close, but the actuator is stuck (1 trip detection logic). |
| Comes on | SAE: P2111 |
P211173 | Throttle Actuator "A" Control System Actuator Stuck Closed | The ECM signals the throttle actuator to open, but the actuator is stuck (1 trip detection logic). |
| Comes on | SAE: P2112 |
MONITOR DESCRIPTION
If the throttle valve remains at a certain angle despite a high drive current from the ECM, the ECM determines that there is a malfunction in the Electronic Throttle Control System (ETCS), illuminates the MIL and stores a DTC.
MONITOR STRATEGY
Required Sensors/Components | Throttle actuator (throttle body with motor assembly) |
Frequency of Operation | Continuous |
TYPICAL ENABLING CONDITIONS
P2111: Throttle Actuator Stuck Open All of the following conditions are met | - |
System guard* judge condition | On |
Throttle actuator current | 2 A or higher |
Duty-cycle to close throttle | 80% or higher |
All of the following conditions are met | - |
System guard* judge condition | On |
Throttle actuator current | 2 A or higher |
Duty-cycle to open throttle | 80% or higher |
*: System guard set when following conditions are met | - |
Throttle actuator | On |
Throttle actuator duty calculation | Executing |
Throttle position sensor malfunction (monitor of following codes judged fail in this trip) | Not detecting |
Throttle actuator current-cut operation | Not executing |
Throttle actuator power supply | 4 V or higher |
Throttle motor malfunction (monitor of following code judged fail in this trip) | Not detecting |
TYPICAL MALFUNCTION THRESHOLDS
P2111: Throttle Actuator Stuck Open Throttle position sensor voltage | No change |
Throttle position sensor voltage | No change |
CONFIRMATION DRIVING PATTERN
HINT:
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
FAIL-SAFE
When these DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 8° throttle valve opening 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 running 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
Refer to DTC P210018.
Click here
CAUTION / NOTICE / HINT
HINT:
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PROCEDURE
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P211172 or P211173) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
P211172 or P211173 is output | A |
P211172 or P211173 and other DTCs are output | B |
HINT:
If any DTCs other than P211172 or P211173 are output, troubleshoot those DTCs first.
B | GO TO DTC CHART |
|
2. | INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) |
(a) Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body with motor assembly. Also check that the throttle valve moves smoothly.
OK:
Throttle valve is not contaminated with foreign matter and moves smoothly.
HINT:
Click here
Click here
NG | GO TO STEP 6 |
|
3. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
4. | READ VALUE USING GTS (THROTTLE POSITION) |
(a) Enter the following menus.
Powertrain > Engine > Data List Tester Display |
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Throttle Position Sensor No.1 Voltage |
Throttle Position Sensor No.2 Voltage |
Throttle Position Command |
(b) Read the values displayed on the GTS while wiggling the ECM wire harness.
(c) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
Value in Data List changes when wire harness is wiggled, or DTC is output | A |
Other than above | B |
B | GO TO STEP 7 |
|
5. | REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY WITH MOTOR ASSEMBLY - ECM) |
(a) As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector.
Click here
NEXT | END |
6. | REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
Click here
HINT:
Click here
Click here
|
7. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
8. | CHECK WHETHER DTC OUTPUT RECURS (DTC P211172 OR P211173) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
DTCs are not output | A |
P211172 or P211173 is output | B |
A | END |
B | REPLACE ECM |
Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.