Toyota Tacoma (2015-2018) Service Manual: Mechanical System Tests
MECHANICAL SYSTEM TESTS
1. STALL SPEED TEST
HINT:
This test is to check the overall performance of the engine and transmission.
CAUTION:
- This test should be done on a paved surface (a surface that is not slippery).
- To ensure safety, perform this test in an open and level area that provides good traction.
- The stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.
NOTICE:
- Do not perform the stall speed test for more than 5 seconds.
- When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List.
(e) Run the vehicle until the transmission fluid temperature is between 50 and 80°C (122 and 176°F).
(f) Allow the engine to idle with the air conditioning off.
(g) Chock all 4 wheels.
(h) Set the parking brake and keep the brake pedal depressed firmly with your left foot.
(i) Move the shift lever to D.
(j) Depress the accelerator pedal as much as possible with your right foot.
(k) Read the engine speed (stall speed) and release the accelerator pedal immediately.
Standard value:
|
Stall Speed |
|
|---|---|
|
1990 rpm |
+ 200 rpm |
|
- 200 rpm |
|
|
Test Result |
Possible Cause |
|---|---|
|
Stall speed is lower than standard value |
|
|
Stall speed is higher than standard value |
|
2. SHIFT TIME LAG TEST
HINT:
When the shift lever is moved while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the condition of the clutch, and brake.
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List.
(e) Run the vehicle until the transmission fluid temperature is between 50 and 80°C (122 and 176°F).
(f) Allow the engine to idle with the air conditioning off.
(g) Set the parking brake and keep the brake pedal depressed firmly.
(h) Check the D position time lag.
(1) Move the shift lever to N and wait for 1 minute.
(2) Move the shift lever to D and measure the time until the shock is felt.
(3) Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.
(i) Check the R position time lag.
(1) Move the shift lever to N and wait for 1 minute.
(2) Move the shift lever to R and measure the time until the shock is felt.
(3) Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.
Standard value:
D position time lag is less than 1.2 seconds
R position time lag is less than 1.5 seconds
Evaluation|
Test Result |
Possible Cause |
|---|---|
|
D position time lag exceeds standard value |
|
|
R position time lag exceeds standard value |
|
Hydraulic Test
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
(a) Measure the line pressure.
CAUTION:
The line pressure test should always be performed with at least 2 people. One
person should observe the condition ...
Road Test
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem analysis, try to reproduce the
symptoms. If the problem is that the transmission does not shift up or down ...
Other materials:
Sleep Operation Failure of Occupant Classification ECU (B1796)
DESCRIPTION
During sleep mode, the occupant detection ECU monitors the condition of each
sensor while the ignition switch is off. In this mode, if the occupant detection
ECU detects an internal malfunction, DTC B1796 is set.
DTC No.
DTC Detections Conditions
Tr ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) Blind spot monitor data and Diagnostic Trouble Codes (DTCs) can be read from
the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning,
use the Techstream to check for malfunctions and to repair it.
2. CHECK DLC3
(a) Check ...
Air Mix Damper Position Sensor Circuit (Driver Side) (B1436/36)
DESCRIPTION
This sensor detects the position of the air mix damper (for driver side) and
sends the appropriate signals to the air conditioning amplifier assembly. The position
sensor is built into the No. 3 air conditioning radiator damper servo sub-assembly
(for driver side air mix).
...
