Engine Hybrid System. Corolla. Zre142 Aze141
2Zr-Fe Engine Control. Corolla. Zre142 Aze141
TYPICAL MALFUNCTION THRESHOLDS
READ VALUE USING TECHSTREAM (+BM VOLTAGE)
CHECK HARNESS AND CONNECTOR (ECM - BATTERY, BODY GROUND)
DTC P2118 Throttle Actuator Control Motor Current Range / Performance |
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.
- HINT:
- The electronic throttle control system does not use a throttle cable.
| DTC No. | DTC Detection Condition | Trouble Area |
| P2118 | Open in electronic throttle control system power source (+BM) circuit (1 trip detection logic) |
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MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the throttle actuator.When the power supply voltage (+BM) drops less than 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.
MONITOR STRATEGY
| Related DTCs | P2118: Throttle actuator power supply line range check (low voltage) |
| Required Sensors/Components (Main) | Throttle actuator, throttle valve (throttle body) ETCS fuse |
| Required Sensors/Components (Related) | None |
| Frequency of Operation | Continuous |
| Duration | 0.8 seconds |
| MIL Operation | Immediate |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever following DTCs not present | None |
| Battery voltage | 8 V or more |
| Electronic throttle actuator power | On |
TYPICAL MALFUNCTION THRESHOLDS
| Electronic throttle actuator power supply voltage (+BM) | Less than 4 V |
COMPONENT OPERATING RANGE
| Electronic throttle control | Normal |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (COROLLA_ZRE142 RM000000PDK0ZAX.html).
- 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 the 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.
Techstream 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
N/A - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
- HINT:
- 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 N/A, perform steps [B] and [C] again.
- DTC judgment completed
- If no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).
- 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 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, 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 opening 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
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the Techstream. 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.READ VALUE USING TECHSTREAM (+BM VOLTAGE) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / +BM Voltage.
Read the value displayed on the Techstream.
- Standard voltage:
- 11 to 14 V
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| OK | ||
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| 2.CHECK HARNESS AND CONNECTOR (ECM - BATTERY, BODY GROUND) |
Disconnect the ECM connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition A50-3 (+BM) - Body ground Always 11 to 14 V
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition B31-44 (ME01) - Body ground Always Below 1 Ω B31-105 (E1) - Body ground Always Below 1 Ω
Reconnect the ECM connectors.
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| OK | ||
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