Tire Pressure Monitor Receiver / Transponder: Service and Repair

TPMS TRANSMITTER

NOTE: This procedure has been updated by TSB-09-42A-014 and 10-42A-001
Check if aluminum or steel wheels are stamped with "26L" or "L" as described in TSB 10-42A-001 and select one of the following service procedures:

1. For Steel Wheels Not Stamped With "L" or "26L".

2. For Steel Wheels with "L" or "26L" Stamp (scroll down for second procedure).





Sample of Stamping

1. REMOVAL AND INSTALLATION - For Steel Wheels Not Stamped With "L" or "26L"

TPMS Transmitter for P/N 4250A225

WARNING: Certain components of this vehicles, such as TPMS transmitters, may contain perchlorate materials. Special handling may apply.

CAUTION
- Do not vary the angle of valve except at mounting on the rim. If varying the angle over and over, it may cause breakage of antenna plate resulting in the failure of TPMS transmitter.
- Ensure valve cap is always in place except when adjusting tire pressure.
- If the valve core and valve cap are replaced, use a genuine replacement part. The valve core is similar to a conventional one, but uses nickel plating to avoid corrosion.
- Replace the seal and seal washer with a new one every five years or when the tire is replaced.
- Do not drop the TPMS transmitter from height greater than 1 meter (3.3 feet).
- Do not expose the TPMS transmitter to extraneous magnetic fields.
- TPMS transmitter should not be stored at temperatures above 80° C (176° F).
- TPMS transmitter should not be exposed to temperatures above 100° C (212° F).
- If the TPMS transmitter is replaced, execute "Tire Pressure Sensor ID Registration" on scan tool MB991958 "Special Function."
- Be careful not to damage the TPMS transmitter.

TPMS Transmitter and Seal

Pre-removal & Post-installation Operation:

When replacing the seal and seal washer, be sure to use the same part (exclusively for p/n 4250A225). Never use the seal washer for p/n 4250B668 in error.







REMOVAL SERVICE POINTS

CAP/VALVE CORE/NUT REMOVAL


CAUTION: Ensure cap is always in place except when adjusting tire pressure.

1. Remove the cap and valve core to deflate the tire.
2. Once tire pressure is released, remove nut and let TPMS transmitter fall into tire.

TPMS TRANSMITTER REMOVAL







CAUTION: Be careful not to damage the TPMS transmitter.

1. Place on tire changing machine and break both tire beads ensuring that the TPMS transmitter remains in the bottom of the tire.
2. Lubricate tire well and remove outer side of the tire.
3. Reach inside the tire and remove the TPMS transmitter.
4. Remove tire from rim using proper tire changing equipment procedures.

SEAL/SEAL WASHER REMOVAL

CAUTION:
- Do not vary the angle of valve except at mounting on the rim. If varying the angle over and over, it may cause breakage of antenna plate resulting in the failure of TPMS transmitter.
- Use a soft tool to remove the grommet and washer to prevent scratching the valve of the TPMS transmitter.







1. Hold the TPMS transmitter and the seal washer, then extract it, this also extracts the seal. Take care to not damage the valve thread.







2. Clean the TPMS transmitter and the valve stem holding the valve as shown. Take care to support the rear of the valve with a thumb so that there is no movement of the stem.

INSTALLATION SERVICE POINTS

A SEAL/SEAL WASHER/TPMS TRANSMITTER/ NUT INSTALLATION

CAUTION: When installing a new seal and seal washer, make sure to support the valve stem base with a thumb so that there is no movement of the stem. Otherwise, the stem may protrude resulting in the breakage of antenna plate.







1. Insert these up to the base of the TPMS transmitter, making sure to secure the valve base with a thumb, as shown. Wipe the seal and threading.

CAUTION:
- Visually check that TPMS transmitter is not deformed or damaged.
- When installing the TPMS transmitter, be sure the rim, seal valve and nut are clean.
- Ensure the grommet is located inside the valve hole before installing the nut.
- While installing the nut, push the TPMS transmitter to maintain the lower lip of the transmitter case is in contact with the rim without clearance.
- While installing the valve nut, ensure the tool is kept aligned to the valve and the valve hole.
- After installing the nut, check that the seal is compressed and seal washer is bend.







2. Install the valve, in the valve hole, without modifying the angle of the stem (retain position of delivery). The laser marking should be visible at the operator.







3. When the valve is completely inserted, maintain the TPMS transmitter in contact with the rim, then screw manually the nut until the contact with the wheel.







4. While maintaining the TPMS transmitter contact with the rim by applying pressure to the back of the valve, slightly press on the cap to wards the center of the wheel in order to adapt the angle of the valve/TPMS transmitter to the profile of the rim.

It is mandatory to guarantee the contact of the housing unit on the rim drop center.







5. While maintaining the TPMS transmitter and valve in position, screw the nut with a torque wrench. Take care that the wrench socket is correctly inserted on the nut.

Specified torque: 8.0 ± 0.5 N.m (71 ± 4 in-lb)

TIRE BEAD MOUNTING







1. Prepare the tire and fix the rim as usual.







2. Put the tire on the rim, so that the cross point of the belt with the rim is approximately 20 cm (7.9 inch) away from the valve.







3. Engage the shoe and make sure that 20 cm (7.9 inch) is maintained between the cross point and the valve. The arrow shows the direction of rotation of the wheel.







4. Turn the wheel in order to engage all the first side of the tire.

NOTE: The standard shoes can pass over the sensor without damaging it.







5. Put the second side of the tire in position, so that the cross point of the belt with the rim is approximately 20 cm (7.9 inch) away from the valve. The curved arrow shows the direction of rotation of the wheel.







6. Turn the wheel in order to engage all of the second side of the tire.

NOTE: The standard shoes can pass over the sensor without damaging it.

TIRE PRESSURE INFLATION/NUT RETIGHTENING

CAUTION: After tire inflation, retighten the valve nut to 8.0 ± 0.5 N.m (71 ± 4 in-lb). This is necessary, because the TPMS transmitter is secured to the wheel with the valve nut and rubber grommet. The rubber grommet will be depressed by tire pressure or deteriorate over a period of time, which requires the valve nut to be retightened.

Inflate tire to required pressure, then retorque the valve nut to 8.0 ± 0.5 N.m (71 ± 4 in-lb).




2. REMOVAL AND INSTALLATION - For Wheels Stamped with "L" or "26L"

TPMS transmitter for MMC PART NO. 4250B668

Warning





New type (42508668) is applied for all aluminum wheels or steel wheels with "Stamp at optional location", where it has the last word "26L" or "L".

Do not use new type (42508668) for steel wheel with out the stamp "26L" or "L" Before installation, check TPMS transmitter part no. shown on the transmitter

Certain components of this vehicles, such as TPMS transmitters, may contain perchlorate materials. Special handling may apply. For additional information, see www.dtsc.ca.gov/hazardouswaste/perchlorate.

When replacing the seal and seal washer, be sure to use the same part (exclusively for p/n 42508668). Never use the seal washer for 4250A225 in error.

CAUTION

- Do not vary the angle of valve except at mounting on the rim. If varying the angle over and over. It may cause breakage of antenna plate resulting in the failure of TPMS Transmitter.
Ensure valve cap is always in place except when adjusting tire pressure.

- If the valve core and valve cap are replaced, use a genuine replacement part. The valve core is similar to a conventional one, but uses nickel plating to avoid corrosion.

- Replace the seal and seal washer with a new one every five years or when the tire is replaced.

- Do not drop the TPMS transmitter from height greater than 1 meter (3.3 feet).

- Do not expose the TPMS transmitter to extraneous magnetic fields.

- TPMS transmitter should not be stored at temperatures above 80 degrees C (176 degrees F).

- TPMS transmitter should not be exposed to temperatures above 100 degrees C (212 degrees F).

- If the TPMS transmitter is replaced, execute "Tire Pressure Sensor ID Registration" on scan tool MB991 958 "Special Function."

- Be careful not to damage the TPMS transmitter.










REMOVAL SERVICE POINTS

CAP/VALVE CORE/NUT REMOVAL

CAUTION

Ensure cap is always in place except when adjusting tire pressure.

1. Remove the cap and valve core to deflate the tire.

2. Once tire pressure is released, remove nut and let TPMS transmitter fall into tire.

TPMS TRANSMITTER REMOVAL

CAUTION

Be careful not to damage the TPMS transmitter






1. Place on tire changing machine and break both tire beads ensuring that the TPMS transmitter remains in the bottom of the tire.

2. Lubricate tire well and remove outer side of the tire.

3. Reach inside the tire and remove the TPMS transmitter.

4. Remove tire from rim using proper tire changing equipment procedures.

SEAL WASHER REMOVAL

CAUTION

Use care to prevent scratching the valve of the TPMS transmitter.






1. Hold the TPMS transmitter and the seal washer, then extract it. lake care to not damage the valve thread.






2. Clean the TPMS transmitter and the valve stem,

[In case of not removing the valve]
If the valve comes out of the transmitter, reinstall it where it was. This is not a failure.






3. Remove the valve from the housing as shown.

INSTALLATION SERVICE POINTS

VALVE/SEAL WASHER]TPMS TRANSMITTER]NUT INSTALLATION





1. Install the valve to the housing as shown.





2. Insert seal washer up to the base of the TPMS transmitter, making sure to secure the valve base with a thumb, as shown.
Wipe the seal and threading.

CAUTION
- Visually check that TPMS transmitter is not deformed or damaged.
- When installing the TPMS transmitter, be sure the rim, seal valve and nut are clean
- Ensure the grommet is located inside the valve hole before installing the nut, While installing the nut, push the TPMS transmitter to maintain the lower lip of the transmitter case is in contact with the rim without clearance.
- While installing the valve nut, ensure the tool is kept aligned to the valve and the valve hole.






2. Install the valve in the valve hole, without modifying the angle of the stem (retain position of delivery). The laser marking should be visible.






3. When the valve is completely inserted, keeping the TPMS transmitter in contact with the rim manually turn the nut until it contacts the wheel.






4. While maintaining the TPMS transmitter contact with the rim by applying pressure to the back of the valve slightly. press on the cap toward the center of the wheel in order to adapt the angle of the valve/TPMS transmitter to the profile of the rim.

It is mandatory to guarantee the contact of the housing unit on the rim drop center






5. While maintaining the TPMS transmitter and valve in position, screw the nut with a torque wrench. Take care that the wrench socket is correctly inserted on the nut.

Specified torque: 8.0 ± 0.5 Nm (71 ± 4 in-lb)

TIRE BEAD MOUNTING






1. Prepare the tire and fix the rim as usual.






2. Put the tire on the rim, so that the cross point of the belt with the rim is approximately 20 cm (7.9 inch) away from the valve.






3. Engage the shoe and make sure that 20 cm (7.9 inch) is maintained between the cross point and the valve. The arrow shows the direction of rotation of the wheel.






4. Turn the wheel in order to engage all the first side of the tire

NOTE: The standard shoes can pass over The sensor without damaging it.






5. Put the second side of the tire in position, so that the cross point of the belt with the rim is approximately 20 cm (7.9 inch) away from the valve. The curved arrow shows the direction of rotation of the wheel.






6. Turn the wheel in order to engage all of the second side of the tire.

NOTE: The standard shoes can pass over The sensor without damaging it.

TIRE PRESSURE INFLATION/NUT RETIGHTENING

Inflate tire to required pressure, then retorque the valve nut to 8.0 ± 0.5 Nm (71 ± 4 in-lb).