Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000026PVY
Model Year Start: 2023 Model: Corolla HV Prod Date Range: [09/2022 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): Drive Start Control; 2023 - 2025 MY Corolla HV [09/2022 -        ]

Drive Start Control

DESCRIPTION

The drive start control is controlled by the hybrid vehicle control ECU.

If the hybrid vehicle control ECU determines that the shift lever and accelerator pedal are operated abnormally, hybrid system 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 hybrid system output may increase when driving uphill and decrease when driving downhill. This is due to drive start control controlling the hybrid system output, and is not a malfunction.

PROCEDURE

1.

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

Shift control

  • 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 (D or B) 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 (D or B), from (D or B) or N to R.

      HINT:

      Operation may not be possible in certain situations.

  • Items Controlled
    • Hybrid system output is restricted.
  • Deactivation Conditions
    • The accelerator pedal is released.
    • The shift lever is in P or N.

Reverse control

  • Activation conditions
  • The shift lever is in R.
  • The accelerator pedal is depressed excessively.
  • Items Controlled
    • Hybrid system output is restricted.
  • Deactivation Conditions
    • The accelerator pedal is released.
    • The shift lever is moved to any position other than R.

HINT:

  • The hybrid system output restricted level differs between Pattern A, Pattern B and Reverse control.
  • During Shift control or Reverse control, hybrid system output is adjusted based on the road gradient.

Result

Proceed to

Performed

A

Not performed

B
B

SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE)

A

2.

CHECK DTC OUTPUT (HEALTH CHECK)

(a) Check the DTCs.

(b) Turn the ignition switch off.

Result

Proceed to

DTCs are not output (Hunting)

A

DTCs are not output (Hesitation/poor acceleration)

B

DTCs are output

C
B

GO TO STEP 6

C

GO TO DTC CHART
A

3.

READ VALUE USING GTS (FR, FL, RR, RL WHEEL SPEED)

(a) Read the values displayed on the GTS.

Chassis > Brake/EPB > Data List

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

Standard:

Tester Display

Condition

Specified Condition

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

Vehicle stopped

0 km/h (0 mph)

Vehicle being driven at constant speed between 16 to 64 km/h (10 to 40 mph)

No large fluctuations when driving at a constant speed

CAUTION:

When performing the confirmation driving pattern, 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.

(b) Turn the ignition switch off.

NG

INSPECT FRONT OR REAR SPEED SENSOR

OK

4.

READ VALUE USING GTS (VEHICLE SPEED)

(a) Read the value of "Vehicle Speed" displayed on the GTS.

Powertrain > Hybrid Control > Data List

Tester Display

Vehicle Speed

Standard:

Inspection Condition

Specified Condition

Vehicle stopped

0 km/h (0 mph)

Vehicle being driven at a constant speed

(16 to 64 km/h (10 to 40 mph))

No large fluctuations in displayed speed

CAUTION:

Perform this road test only in an appropriate safe location, in accordance with all local 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.

(b) Turn the ignition switch off.

NG

INSPECT ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

5.

READ VALUE USING GTS (FORWARD AND REARWARD G)

(a) Read the value displayed on the GTS.

Chassis > Brake/EPB > Data List

Tester Display

Forward and Rearward G

Standard:

Condition

Specified Condition

During deceleration

Value changes with vehicle speed

During acceleration

Value changes with vehicle speed

CAUTION:

When performing the confirmation driving pattern, 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.

(b) Turn the ignition switch off.

OK

SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE)

NG

INSPECT ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

6.

INSPECT SHIFT LEVER POSITION SENSOR

(a) Inspect the shift lever position sensor.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV [09/2022 -        ]; PA10 (HYBRID TRANSMISSION / TRANSAXLE): SHIFT LEVER POSITION SENSOR: INSPECTION

Result

Proceed to

Normal

A

Abnormal

B
B

REPLACE SHIFT LEVER POSITION SENSOR

A

7.

READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %)

(a) Read the value displayed on the GTS.

Powertrain > Hybrid Control > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage %

Accelerator Position Sensor No.2 Voltage %

OK:

Condition

Specified Condition

Accelerator Pedal Released → Depressed

Values smoothly change following accelerator pedal operation

(b) Turn the ignition switch off.

OK

SYSTEM NORMAL (GO TO PROBLEM SYMPTOM TABLE)

NG

REPLACE ACCELERATOR PEDAL (WITH SENSOR) ROD ASSEMBLY