Lexus ES: Road Test
ROAD TEST
PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and simulate the problem symptoms.
ROAD TEST
CAUTION:
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Strictly obey all traffic rules and regulations.
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- Do not drive the vehicle with the Techstream cable contacting the pedals, shift lever or steering wheel.
- Driving the wheel with the Techstream cable contacting these areas could impede vehicle control, resulting in a serious accident.
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Do not operate the Techstream while driving the vehicle.
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- Operating the Techstream while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.
NOTICE:
- Be sure to inspect and adjust the engine before performing these tests.
- Perform the road test with the engine coolant temperature between 60 and 100°C (140 and 212°F) and the ATF temperature between 50 and 100°C (122 and 212°F).
-
Perform these tests with the air conditioning and cruise control off.
Inspection
Procedure
Transmission Control Switch Test
With the vehicle stationary and the shift lever in D, move the shift lever to S and return it to D. Check that the meter display changes from D to the appropriate S gear and then back again.
S Position Test
While driving with the shift lever in S, move the shift lever to "+" and "-". Check that the meter display changes accordingly.
D Position Shift Test
While driving the vehicle normally, check that the transaxle shifts up and down through each gear properly.
Lock-up Function
While driving on a level surface at a constant speed in the lock-up range with the shift lever in D, lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
P Position Test
Stop the vehicle on an incline (approximately 5° or more). Then move the shift lever to P and release the parking brake. Check that the parking lock pawl holds the vehicle in place.
Abnormal Noise and Vibration
Check for abnormal noise and vibration while driving the vehicle forward and backward, and during shift operations.
Fluid Leakage
After performing all other road test inspections, check for fluid leakage.
HINT:
When checking for DTCs after a repair, drive the vehicle according to the monitor drive pattern.
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(a) Gear change confirmation
(1) Connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Enter the following menus: Powertrain / Transmission / Data List.
Powertrain > Transmission > Data List| Tester Display |
|---|
| Vehicle Speed |
| Coolant Temperature |
| NT Sensor Speed |
| A/T Oil Temperature No.1 |
| Shift Status |
(4) Check that the transaxle shifts to each gear while gently accelerating to 85 km/h (53 mph) or higher.
HINT:
- Check that the value of NT Sensor Speed drops by 50 rpm or more when the value of Shift Status increases.
- Depending on the engine speed when the gear is changed, it may be difficult to see the change of NT Sensor Speed.
(b) Lock-up confirmation
(1) Connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Enter the following menus: Powertrain / Transmission / Data List.
Powertrain > Transmission > Data List| Tester Display |
|---|
| Vehicle Speed |
| Engine Speed |
| Coolant Temperature |
| Accel Position from EFI |
| NT Sensor Speed |
| A/T Oil Temperature No.1 |
| Lock Up Status |
| Shift Status |
(4) When the following conditions are met, check that the difference between Engine Speed and NT Sensor Speed is 50 rpm or less.
Lock-up Schedule:
| Vehicle Speed (Constant speed) | 85 km/h (53 mph) |
| Shift Status | 8th |
| Lock Up Status | ON |
HINT:
- If Lock Up Status does not change to ON, decrease the accelerator pedal opening angle or increase the vehicle speed.
- Lock-up will not be engaged if the accelerator pedal is released.
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Lock-up prohibition conditions:
- Engine coolant temperature is less than 20°C (68°F)
- ATF temperature is less than 20°C (68°F) or higher than 110°C (230°F)
- Throttle valve is fully closed
- Stop light switch is on
READ NEXT:
Shift Paddle Switch Circuit
DESCRIPTION Moving the shift lever to S enables the shift range to be selected. The shift range can be selected by operating the "+" or "-" shift paddle switch. WIRING DIAGRAM CAUTION / NOTICE / HINT
System Diagram
SYSTEM DIAGRAM
Terminals Of Ecm
TERMINALS OF ECM ECM HINT: The standard voltage and resistance of each ECM terminal is shown in the table below. In the table, first follow the information under "Condition". Look under "Terminal No.
SEE MORE:
Motor Control Relay Stuck ON (Fr Shade) (B234A)
DESCRIPTION This DTC will be stored if the operation of the front roof sunshade is suspended and a pulse input of 10 Hz or more is detected when the motor relay is off. DTC No. Detection Item DTC Detection Condition Trouble Area B234A Motor Control Relay Stuck ON (Fr Shade) Position
DC/DC Converter Current Sensor Signal Stuck In Range (P0E512A)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC is stored if the value of the reactor current sensor does not change. The cause of this malfunction may be one of the following: Area Main Malfunction Description Inverter
Inverter internal circuit malfunction
Malfunction in ECU that contr
