Checking Internal Components of the Transmission

Checking internal components of the transmission

Checking shift solenoids













Note! Do not damage components and terminals when test measuring. Handle components and terminals carefully.

Check 1
Connect an ohmmeter between terminal #1 and the outer casing of the gear shift solenoid. For resistance values see the table below.
When measuring at temperatures other than +20 °C a test measurement must be taken at +20 °C. This is to establish if the resistance is correct or not.






Check 2
Connect a temporary voltage supply (+) to gear shift solenoid terminal # 1 and a temporary ground terminal (-) to the gearshift solenoid outer casing. Check the function of the solenoid.

Check 3
Connect a temporary voltage supply (+) to gear shift solenoid terminal # 1 and a temporary ground terminal (-) to the gearshift solenoid outer casing. Blow using compressed air according as illustrated. Check the function of the solenoid.

Checking the line pressure solenoid SLT, SLC1, SLC2, SLC3, SLB1 and Lock-up solenoid SLU












Connect the breakout box. See: Breakout box, connecting, B6304T4, TF-80SC AWD, B5254T5, TF-80SC Connecting Breakout Box, Transmission Control Module (TCM)

Note! When check-measuring, components and connections must be handled carefully to avoid damage. The upper figure shows the resistance properties for linear pressure solenoids SLT and SLU. The lower shows the resistance properties for SLB1, SLC1, SLC2, SLC3

Check 1
Connect an ohmmeter to the breakout box between the terminals for the selected solenoid. For resistance values see the table below.

for line pressure solenoid SLT:
- terminals #B3 (#3) and #B1 (#1)

for lock-up solenoid SLU:
- terminals #B9 (#9) and #B4 (#4)

for line pressure solenoid SLB1:
- terminals #B21 (#21) and #B16 (#16)

for line pressure solenoid SLC1:
- terminals #B11 (#11) and #B10 (#10)

for line pressure solenoid SLC2:
- terminals #B17 (#17) and #B18 (#18)

for line pressure solenoid SLC3:
- terminals #B14 (#14) and #B22 (#22)
When measuring at temperatures other than +20 °C a test measurement must be taken at +20 °C. This is to establish if the resistance is correct or not.






Checking the oil temperature sensor




Connect the breakout box. See: Breakout box, connecting, B6304T4, TF-80SC AWD, B5254T5, TF-80SC Connecting Breakout Box, Transmission Control Module (TCM)

Note! Do not damage components and terminals when test measuring. Handle components and terminals carefully.

Check 1
Connect an ohmmeter between # A7 and #A8 on the breakout box.
Start the engine and run it at idle speed to raise the temperature of the transmission.
For resistance values see the table below.
A test measurement must be taken at all three temperatures. This is to establish if the resistance is correct or not.






Checking the input and output speed sensors for the transmission





Note! The transmission control module (TCM) must not be connected.

Connect the breakout box. See: Breakout box, connecting, B6304T4, TF-80SC AWD, B5254T5, TF-80SC Connecting Breakout Box, Transmission Control Module (TCM)

Note! Do not damage components and terminals when test measuring. Handle components and terminals carefully.

Check 1
Connect an ohmmeter between the sensor terminals on the breakout box. Check the resistance. The resistance must be more than 1 Mohms but not infinite.

For transmission input speed sensor:
- terminal #12 and #13 on the breakout box

For transmission output speed sensor:
- terminal #19 and #20 on the breakout box

Note! Check the resistance using an ohmmeter which can measure resistances above 10 Mohms.

If the resistance is 0 ohms it means that the cables are short-circuited to each other or that the sensor is faulty.
If resistance is infinite it means that there is an open circuit in the circuit.
Check the wiring. Measure the resistance between a terminal and a ground point.
If the resistance is 0 ohms it means that the cable has a short-circuit to ground.
If resistance is infinite it means that there is an open circuit in the circuit.

Check 2
Connect a temporary voltage supply to:

transmission input speed sensor:
- terminal #A12 on the breakout box

transmission output speed sensor:
- terminal #A19 on the breakout box
Connect a temporary ground terminal via a 100 ohms resistor and an ammeter/voltmeter to:

transmission input speed sensor:
- terminal #A13 on the breakout box

transmission output speed sensor:
- terminal #A20 on the breakout box
Move the gear selector lever to gear position N. Raise the vehicle so that the drive wheels hang freely. Measure the current/voltage while spinning the wheels in the same direction. For values see the table below.