RM3660EC _53 Suspension _080780 TIRE PRESSURE MONITORING _0393955 TIRE PRESSURE WARNING SYSTEM(for Gasoline Model (for Type A)) C

TIRE PRESSURE MONITORING  TIRE PRESSURE WARNING SYSTEM(for Gasoline Model (for Type A))  C2179  Tire Pressure Monitor ECU Communication Stop  


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

C414632E05
1.156,0.542 3.365,0.76 2.208,0.219 10 false from Engine Stop and Start ECU 1.146,1.271 3.354,1.49 2.208,0.219 10 false from Engine Stop and Start ECU 4.698,0.542 5,0.771 0.302,0.229 10 false IG 4.667,1.25 4.969,1.479 0.302,0.229 10 false +B 4.292,1.063 4.719,1.323 0.427,0.26 10 false 7*1 4.292,0.344 4.594,0.573 0.302,0.229 10 false 1*1 4.302,2.625 4.698,2.844 0.396,0.219 10 false 5*1 4.677,2.823 5.156,3.104 0.479,0.281 10 false PRG 2.156,2.698 2.635,2.979 0.479,0.281 10 false PRG 2.625,2.698 2.927,2.927 0.302,0.229 10 false 11 1.271,2.927 1.75,3.208 0.479,0.281 10 false CPU 0.302,3.823 3.375,4.063 3.073,0.24 10 false Main Body ECU (Multiplex Network Body ECU) 0.292,3.667 0.771,3.948 0.479,0.281 10 false I84 4.271,2.833 4.75,3.115 0.479,0.281 10 false O18 4.25,3.646 6.958,3.896 2.708,0.25 10 false Tire Pressure Warning ECU and Receiver 3.719,4.063 6.427,4.313 2.708,0.25 10 false *1: w/ Smart Entry and Start System 3.729,4.354 6.438,4.604 2.708,0.25 10 false *2: w/o Smart Entry and Start System 4.25,1.271 4.729,1.552 0.479,0.281 10 false O18 4.26,0.552 4.74,0.833 0.479,0.281 10 false O18 3.865,0.552 4.344,0.833 0.479,0.281 10 false O124 3.865,1.271 4.344,1.552 0.479,0.281 10 false O124 3.865,2.833 4.344,3.115 0.479,0.281 10 false O124 3.927,2.625 4.323,2.844 0.396,0.219 10 false 5*2 3.927,1.063 4.354,1.323 0.427,0.26 10 false 7*2 3.906,0.344 4.208,0.573 0.302,0.229 10 false 1*2

CAUTION / NOTICE / HINT

NOTICE:
·

When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the GTS and write them down before removal.

·

It is necessary to perform initializationSuspension>TIRE PRESSURE MONITORING>TIRE PRESSURE WARNING SYSTEM (for Gasoline Model (for Type A))>INITIALIZATION after registrationSuspension>TIRE PRESSURE MONITORING>TIRE PRESSURE WARNING SYSTEM (for Gasoline Model (for Type A))>REGISTRATION of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*

*: w/ Smart Entry and Start System




PROCEDURE

1.INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (OUTPUT WAVEFORM)
a.
C385231C19
1.219,0.219 1.615,0.448 0.396,0.229 0.865,1.729 1.156,1.094 true 0.208,0.229 0.521,0.427 0.313,0.198 10 false *a 2.875,3.406 3.188,3.604 0.313,0.198 10 false *b 0.719,1.771 1.125,2 0.406,0.229 10 false PRG 1.292,0.25 1.698,0.479 0.406,0.229 10 false I84
*a Component with harness connected
(Main Body ECU (Multiplex Network Body ECU))
*b GND


Using an oscilloscope, check the waveform.

NOTICE:

With the connector connected, check from the backside of the connector.


OK:
Tester Connection Tool Setting Range Condition Specified Condition
I84-11 (PRG) - Body ground 5 V/DIV.5 ms./DIV. Ignition switch ON Waveform generation



Result:
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

Click hereSuspension>TIRE PRESSURE MONITORING>TIRE PRESSURE WARNING RECEIVER>REMOVAL


B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


C

2.CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT)
2.CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT)
a.

Disconnect the I84 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
I84-11 (PRG) - Body ground Ignition switch ON 9.8 V or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

3.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
3.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
a.

Turn the ignition switch off.


b.

Disconnect the O18*1 or O124*2 tire pressure warning ECU and receiver connector.

*1: w/ Smart Entry and Start System

*2: w/o Smart Entry and Start System



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
w/ Smart Entry and Start System
Tester Connection Condition Specified Condition
O18-5 (PRG) - I84-11 (PRG) Always Below 1 Ω
O18-5 (PRG) or I84-11 (PRG) - Body ground Always 10 kΩ or higher

w/o Smart Entry and Start System
Tester Connection Condition Specified Condition
O124-5 (PRG) - I84-11 (PRG) Always Below 1 Ω
O124-5 (PRG) or I84-11 (PRG) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (POWER SUPPLY - TIRE PRESSURE WARNING ECU AND RECEIVER)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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:
w/ Smart Entry and Start System
Tester Connection Condition Specified Condition
O18-7 (+B) - Body ground Always 10 to 16 V
O18-1 (IG) - Body ground Ignition switch ON 10 to 16 V

w/o Smart Entry and Start System
Tester Connection Condition Specified Condition
O124-7 (+B) - Body ground Always 10 to 16 V
O124-1 (IG) - Body ground Ignition switch ON 10 to 16 V



Result:
Result Proceed to
OK A
NG B



A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Click hereSuspension>TIRE PRESSURE MONITORING>TIRE PRESSURE WARNING RECEIVER>REMOVAL


B

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>Backup Boost Converter Circuit