Code No. C1952:
Tyre air pressure low, Tyre5
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caution |
- If
diagnosis code No. C1952 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.
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When the tyre pressure included in the signal from the TPMS transmitter is less than the
specified value, ETACS-ECU <Vehicles without KOS> or KOS-ECU sets this code.
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- Malfunction of CAN bus line
- Drop of tyre pressure
- Loose TPMS transmitter mounting nut
- Flat tyre
- TPMS transmitter malfunction
- ETACS-ECU <Vehicles without KOS> or KOS-ECU malfunction
- CAN-bus line malfunction
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Check that there is no abnormality for the items below.
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- Flat tyre
- Cracked tyre
- Air leak from valve
- Loose TPMS transmitter mounting nut.
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Q.
Is the check result normal?
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Go to Step 2.
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Replace it. Then go to Step 2.
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STEP 2. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON"
position.
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(2)Adjust the pressure to the recommended tyre pressure.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. Check whether the diagnosis code is set again.
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(1)Drive the vehicle for 5 minutes.
note |
Even within 5 minutes, if the TPMS warning lamp goes out, finish the driving and perform
the operation (2).
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 4.
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The procedure is complete.
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STEP 4. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting). On completion,
go to Step 5.
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STEP 5. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON"
position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 6.
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The procedure is complete.
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STEP 6. Tyre pressure check by M.U.T.-III
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(1)Perform the transmitter check using the M.U.T.-III (Refer to ), and
check the tyre pressure values of all the wheels.
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(2)Check the tyre pressure of all the wheels using the tyre pressure gauge.
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(3)Compare the measured value (1) with (2). OK: 20 kPa or less
note |
Do not replace the TPMS transmitter which cannot be checked.
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Q.
Is the check result normal?
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Replace the KOS-ECU (Refer to GROUP 42B - KOS-ECU) <Vehicles
without KOS> or ETACS-ECU (Refer to GROUP 54A - ETACS-ECU) and register the
ID codes. Then go to Step 9.
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Go to Step 7.
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STEP 7. Tyre pressure check by M.U.T.-III
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(1)Perform the transmitter check using the M.U.T.-III (Refer to ), and
check the tyre pressure values of all the wheels.
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(2)Check the tyre pressure of all the wheels using the tyre pressure gauge.
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(3)Compare the measured value (1) with (2). OK: 20 kPa or less
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Q.
Is the check result normal?
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Replace the KOS-ECU (Refer to GROUP 42B - KOS-ECU) <Vehicles
without KOS> or ETACS-ECU (Refer to GROUP 54A - ETACS-ECU) and register the
ID codes. Then go to Step 9.
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Replace the TPMS transmitter and register the ID codes (Refer to ).
Then go to Step 8.
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STEP 8. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON"
position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the KOS-ECU (Refer to GROUP 42B - KOS-ECU) <Vehicles
without KOS> or ETACS-ECU (Refer to GROUP 54A - ETACS-ECU) and register the
ID codes. Then go to Step 9.
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The procedure is complete.
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STEP 9. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON"
position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Start over at Step 1.
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The procedure is complete.
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