DESCRIPTION The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | C2179 |
Tire Pressure Monitor ECU Communication Stop |
Communication
between the main body ECU (multiplex network body ECU) and tire
pressure warning ECU and receiver is interrupted for 10 seconds or more. |
- Main body ECU (Multiplex network body ECU)
- Wire harness or connector
- Tire pressure warning ECU and receiver
| - | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE |
1. | INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (OUTPUT WAVEFORM) |
| (a) Using an oscilloscope, check the waveform. NOTICE:
With the connector connected, check from the backside of the connector.
Standard Voltage: |
Tester Connection | Tool Setting Range |
Condition | Specified Condition | |
G34-11 (PRG) - Body ground |
5 V/DIV.5 ms./DIV. |
Power switch on (IG) |
Waveform generation | |
 |
|
*a | Component with harness connected
(Main Body ECU (Multiplex Network Body ECU)) | |
*b | GND | | |
|
Result | Proceed to | |
Waveform is as shown in the illustration. (Waveform alternates between 9.8 V or higher and 1.2 V or less) |
A | | Waveform does not change from 9.8 V or higher |
B | | Waveform does not change from 1.2 V or less |
C |
| A |
 | REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
| B |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
C |
 | |
| 2. |
CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT) |
(a) Disconnect the G34 main body ECU (multiplex network body ECU) connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G34-11 (PRG) - Body ground |
Power switch on (IG) |
9.8 V or higher |
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
NG | |
| |
| 3. |
CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Turn the power switch off. (b) Disconnect the K11 tire pressure warning ECU and receiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K11-5 (PRG) - G34-11 (PRG) |
Always | Below 1 Ω | |
K11-5 (PRG) or G34-11 (PRG) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (POWER SUPPLY - TIRE PRESSURE WARNING ECU AND RECEIVER) |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
K11-7 (+B) - Body ground |
Always | 10 to 16 V | |
K11-1 (IG) - Body ground |
Power switch on (IG) |
10 to 16 V |
| OK |
| REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
after registration
