Lexus ES: Drive Start Control
DESCRIPTION
The drive start control is controlled by the ECM.
If the ECM determines that the shift lever and accelerator pedal are operated abnormally, engine output is restricted and, when necessary, a warning is displayed on the combination meter assembly.
CAUTION / NOTICE / HINT
HINT:
Even if the accelerator pedal position is maintained, the engine output may increase when driving uphill and decrease when driving downhill. This is due to the drive start control controlling the engine output, and is not a malfunction.
PROCEDURE
| 1. | SYMPTOM CONFIRMATION |
(a) Interview the customer to confirm the problem.
| Result | Proceed to |
|---|---|
| Hunting | A |
| Hesitation/poor acceleration | B |
| B | .gif) | GO TO STEP 8 |
|
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| 2. | PAST ACTIVATION CONFIRMATION |
(a) Check if the customer operated the vehicle in a way that would cause the drive start control to operate.
Drive Start Control Activation Conditions- Activation conditions
-
Pattern A (When all of the following conditions are met, control starts.)
- The accelerator pedal is open by approximately 1/5 or more.
- The shift lever is moved from P to any forward position (D or S) or R.
-
Pattern B (When all of the following conditions are met, control starts.)
- The accelerator pedal is open by approximately 1/5 or more.
-
The shift lever is moved from R to any forward position (D or S), any forward position (D or S) to R, or N to R.
-
Items Controlled
- Engine output is restricted.
-
Deactivation Conditions
- The accelerator pedal is released.
- The shift lever is in P or N.
- Activation conditions
- The shift lever is in R.
-
The accelerator pedal is depressed excessively.
-
Items Controlled
- Engine output is restricted.
-
Deactivation Conditions
- The accelerator pedal is released.
- The shift lever is moved to any position other than R.
HINT:
- The engine output restricted level differs between pattern A, pattern B and Reverse control.
- During reverse control or shift control, engine output is adjusted based on the road gradient and steering angle.
| Result | Proceed to |
|---|---|
| Performed | A |
| Not performed | B |
| B | | SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE) |
|
| 3. | CHECK DTC OUTPUT |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Check the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO DTC CHART |
|
| 4. | READ VALUE USING TECHSTREAM (FR, FL, RR, RL WHEEL SPEED) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine.
(e) Enter the following menus: Chassis / Brake/EPB / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.
Chassis > Brake/EPB > Data List| Tester Display |
|---|
| FR Wheel Speed |
| FL Wheel Speed |
| RR Wheel Speed |
| RL Wheel Speed |
(f) Read the value displayed on the Techstream.
Standard:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed | Vehicle stopped, engine running | 0 km/h (0 mph) |
| Vehicle being driven at constant speed between 16.1 to 64.4 km/h (10 to 40 mph) | No large fluctuations when driving at a constant speed |
CAUTION:
When performing a drive test, obey all speed limits and traffic laws.
HINT:
Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| NG | | INSPECT FRONT OR REAR SPEED SENSOR |
|
| 5. | READ VALUE USING TECHSTREAM (OUTPUT AXIS SPEED) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Output Axis Speed.
Powertrain > Engine > Data List| Tester Display |
|---|
| Output Axis Speed |
(e) Read the value displayed on the Techstream.
Standard:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| Output Axis Speed | Vehicle stopped, engine running | 0 rpm |
| Vehicle being driven at a constant speed of approximately 60 km/h (37 mph) | No large fluctuations when driving at a constant speed |
CAUTION:
When performing a drive test, obey all speed limits and traffic laws.
HINT:
Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| NG | | INSPECT TRANSMISSION REVOLUTION SENSOR |
|
| 6. | READ VALUE USING TECHSTREAM (LATERAL G AND FORWARD AND REARWARD G) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / Brake/EPB / Data List / Lateral G and Forward and Rearward G.
Chassis > Brake/EPB > Data List| Tester Display |
|---|
| Lateral G |
| Forward and Rearward G |
(e) Read the value displayed on the Techstream.
Standard:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| Lateral G Forward and Rearward G | During deceleration | Value changes with vehicle speed |
| During acceleration | Value changes with vehicle speed |
CAUTION:
When performing a drive test, obey all speed limits and traffic laws.
HINT:
Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| NG | | INSPECT AIRBAG ECU ASSEMBLY |
|
| 7. | READ VALUE USING TECHSTREAM (STEERING ANGLE VALUE) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / Brake/EPB / Data List / Steering Angle Value.
Chassis > Brake/EPB > Data List| Tester Display |
|---|
| Steering Angle Value |
(e) Read the value displayed on the Techstream.
Standard:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| Steering Angle Value | Steering wheel turned left | Value increases with steering wheel operation |
| Steering wheel turned right | Value decreases with steering wheel operation |
CAUTION:
When performing a drive test, obey all speed limits and traffic laws.
HINT:
Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.
| OK | | SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE) |
| NG | | INSPECT STEERING SENSOR |
| 8. | PAST ACTIVATION CONFIRMATION |
(a) Check if the customer operated the vehicle in a way that would cause the drive start control to operate.
Drive Start Control Activation Conditions- Activation conditions
-
Pattern A (When all of the following conditions are met, control starts.)
- The accelerator pedal is open by approximately 1/5 or more.
- The shift lever is moved from P to any forward position (D or S) or R.
-
Pattern B (When all of the following conditions are met, control starts.)
- The accelerator pedal is open by approximately 1/5 or more.
-
The shift lever is moved from R to any forward position (D or S), any forward position (D or S) to R, or N to R.
-
Items Controlled
- Engine output is restricted.
-
Deactivation Conditions
- The accelerator pedal is released.
- The shift lever is in P or N.
- Activation conditions
- The shift lever is in R.
-
The accelerator pedal is depressed excessively.
-
Items Controlled
- Engine output is restricted.
-
Deactivation Conditions
- The accelerator pedal is released.
- The shift lever is moved to any position other than R.
HINT:
- The engine output restricted level differs between pattern A, pattern B and Reverse control.
- During reverse control or shift control, engine output is adjusted based on the road gradient and steering angle.
| Result | Proceed to |
|---|---|
| Performed | A |
| Not performed | B |
| A | | SYSTEM NORMAL |
|
| 9. | CHECK DTC OUTPUT |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Check the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO DTC CHART |
|
| 10. | INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
(a) Inspect the park/neutral position switch assembly.
Click here .gif)
| Result | Proceed to |
|---|---|
| Normal | A |
| Abnormal | B |
| B | | REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
|
| 11. | READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE % AND NO. 2 VOLTAGE %) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %.
Powertrain > Engine > Data List| Tester Display |
|---|
| Accelerator Position Sensor No.1 Voltage % |
| Accelerator Position Sensor No.2 Voltage % |
(e) Read the value displayed on the Techstream.
OK:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| Accelerator Position Sensor No.1 Voltage % | Accelerator Pedal Released → Depressed | Values smoothly change following accelerator pedal operation |
| Accelerator Position Sensor No.2 Voltage % |
HINT:
For numerical values of Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %, refer to the Data List.
Click here
| OK | | SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE) |
| NG | | REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY |
READ NEXT:
Rough Idling
DESCRIPTION Problem Symptom Suspected Area Trouble Area
Engine speed fluctuation due to abnormal combustion
Idle speed too low or high
Strong engine vibration due to above symptoms
Engine Difficult to Start
DESCRIPTION Problem Symptom Suspected Area Trouble Area
Engine speed fluctuation due to abnormal combustion
Idle speed too low or high
Strong engine vibration due to above symptoms
Engine Stalls
DESCRIPTION Problem Symptom Suspected Area Trouble Area
Engine speed fluctuation due to abnormal combustion
Idle speed too low or high
Strong engine vibration due to above symptoms
SEE MORE:
Electronic key battery
Replace the battery with a new one
if it is depleted.
■If the electronic key battery is depleted
The following symptoms may occur:
The smart access system with push-button
start and wireless remote control will
not function properly.
The operational range will be reduced.
Items to
Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS NOTICE:
If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The operation history fun
