DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PRECAUTION
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CHECK FOR OPEN IN CAN BUS WIRE (TIRE PRESSURE WARNING ECU CAN BRANCH WIRE)
CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND)
DTC U0127 Lost Communication with Tire Pressure Monitor Module
DESCRIPTION
| DTC Code | DTC Detection Condition | Trouble Area |
| U0127 | There is no communication from the tire pressure warning ECU. | Power source or inside of tire pressure warning ECU and receiver
Tire pressure warning ECU and receiver CAN branch wire or connector
Tire pressure warning ECU and receiver
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For vehicles with an tire pressure warning system.
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work ().
| 2.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
| 3.CHECK FOR OPEN IN CAN BUS WIRE (TIRE PRESSURE WARNING ECU CAN BRANCH WIRE) |
Disconnect the L60 tire pressure warning ECU and receiver connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| L60-3 (CP1) - L60-6 (CN1) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Tire Pressure Warning ECU and Receiver) |
| | REPAIR OR REPLACE TIRE PRESSURE WARNING ECU CAN BRANCH WIRE OR CONNECTOR (CP1, CN1) |
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| 4.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND) |
Connect the cable to the negative (-) battery terminal.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ()
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| L60-1 (IG1) - Body ground | Ignition switch ON | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| L60-4 (GN1) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Tire Pressure Warning ECU and Receiver) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER ()
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