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 |
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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. |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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. OK:
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Result | Proceed to |
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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) |
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2. | CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT) |
(a) Disconnect the G38 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 |
---|---|---|
G38-11 (PRG) - Body ground | Power switch on (IG) | 9.8 V or higher |
OK | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
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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 N8 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 |
---|---|---|
N8-5 (PRG) - G38-11 (PRG) | Always | Below 1 Ω |
N8-5 (PRG) or G38-11 (PRG) - Body ground | Always | 10 kΩ or higher |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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 |
---|---|---|
N8-7 (+B) - Body ground | Always | 10 to 16 V |
N8-1 (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 |