DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [10/2014 - 10/2015]: Procedure

1. Reconfirm DTCs.

   HINT: 

   If the power management control ECU outputs only DTC U0129, troubleshoot DTC U0129 and check the branch circuit of sub bus 15.

   Result

   Result	Proceed to
   The power management control ECU outputs DTC U0129 and other DTCs. (Techstream display: Hybrid Control)	A
   The power management control ECU outputs only DTC U0129. (Techstream display: Hybrid Control)	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC 

(Refer to DTC U0129: Lost Communication with Brake System Control Module [10/2014 - 10/2015] )

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   D105-31 (CA3P) - D105-30 (CA3N)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
   			70 Ω or higher: Open circuit in a main bus line
   D105-31 (CA3P) - D105-4 (E12)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
   D105-30 (CA3N) - D105-4 (E12)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
   D105-31 (CA3P) - D105-7 (AM21)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   D105-30 (CA3N) - D105-7 (AM21)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

   HINT: 

   • When the values are as specified, clear and recheck for DTCs. When no DTCs are output, check for malfunctions such as damage or improper connection of the relevant connectors.
   • If DTCs are output although the bus circuit is normal and DTCs were cleared, replace the power management control ECU.

   Result

   Result	Proceed to
   OK	A
   NG (Open circuit in CAN main bus line)	B
   NG (Short circuit between bus lines)	C
   NG (Ground short) NG (+B short)	D

Result: 

A 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

C 

See step  6

Result: 

D 

See step  10

Result: 

B 

See step  3

1. Disconnect the D105 power management control ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D105-31 (CA3P) - D105-30 (CA3N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

NG 

See step  4

1. Reconnect the D105 power management control ECU connector.
2. Disconnect the A59 No. 6 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   A59-2 (CANH) - A59-8 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	ECM
   A59-3 (CANH) - A59-9 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Power management control ECU

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to No. 6 CAN Junction Connector)
   *b	to ECM
   *c	to Power Management Control ECU

   Result

   Result	Proceed to
   OK	A
   NG (Open circuit in power management control ECU CAN main bus line)	B
   NG (Open circuit in ECM CAN main bus line)	C

Result: 

A 

REPLACE NO. 6 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 6 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  5

1. Reconnect the A59 No. 6 CAN junction connector.
2. Disconnect the A18 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A18-12 (CANP) - A18-25 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

1. Disconnect the D105 power management control ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D105-31 (CA3P) - D105-30 (CA3N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

NG 

See step  7

1. Reconnect the D105 power management control ECU connector.
2. Disconnect the A59 No. 6 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   A59-1 (CANH) - A59-7 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Skid control ECU (brake booster with master cylinder assembly)
   A59-2 (CANH) - A59-8 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	ECM
   A59-3 (CANH) - A59-9 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Power management control ECU

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to CAN No. 6 Junction Connector)
   *b	to Skid Control ECU (Brake Booster with Master Cylinder Assembly)
   *c	to ECM
   *d	to Power Management Control ECU

   Result

   Result	Proceed to
   OK	A
   NG (Short circuit between bus lines in power management control ECU CAN main bus line)	B
   NG (Short circuit between bus lines in ECM CAN main bus line)	C
   NG (Short circuit between bus lines in skid control ECU (brake booster with master cylinder assembly) CAN branch line)	D

Result: 

A 

REPLACE NO. 6 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 6 CAN JUNCTION CONNECTOR) 

Result: 

D 

See step  9

Result: 

C 

See step  8

1. Reconnect the A59 No. 6 CAN junction connector.
2. Disconnect the A18 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A18-12 (CANP) - A18-25 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

1. Reconnect the A59 No. 6 CAN junction connector.
2. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A51-35 (CA2H) - A51-34 (CA2L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) 

1. Disconnect the A59 No. 6 CAN junction connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Purpose	Connected to
   A59-1 (CANH) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANH ground short	Skid control ECU (brake booster with master cylinder assembly)
   A59-7 (CANL) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANL ground short
   A59-2 (CANH) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANH ground short	ECM
   A59-8 (CANL) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANL ground short
   A59-3 (CANH) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANH ground short	Power management control ECU
   A59-9 (CANL) - D28-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Inspection for CANL ground short
   A59-1 (CANH) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANH +B short	Skid control ECU (brake booster with master cylinder assembly)
   A59-7 (CANL) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANL +B short
   A59-2 (CANH) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANH +B short	ECM
   A59-8 (CANL) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANL +B short
   A59-3 (CANH) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANH +B short	Power management control ECU
   A59-9 (CANL) - D28-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Inspection for CANL +B short

   TEXT IN ILLUSTRATION
   
   

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to No. 6 CAN Junction Connector)	*b	to Skid Control ECU (Brake Booster with Master Cylinder Assembly)
   *c	to ECM	*d	to Power Management Control ECU

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
   • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (Ground short in power management control ECU CAN main bus line) NG (+B short in power management control ECU CAN main bus line)	B
   NG (Ground short in ECM CAN main bus line) NG (+B short in ECM CAN main bus line)	C
   NG (Ground short in skid control ECU (brake booster with master cylinder assembly) CAN branch line) NG (+B short in skid control ECU (brake booster with master cylinder assembly) CAN branch line)	D

Result: 

A 

REPLACE NO. 6 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  12

Result: 

D 

See step  13

Result: 

B 

See step  11

1. Disconnect the D105 power management control ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Purpose	Specified Condition
   D105-31 (CA3P) - D105-4 (E12)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH ground short	200 Ω or higher
   D105-30 (CA3N) - D105-4 (E12)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL ground short
   D105-31 (CA3P) - D105-7 (AM21)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH +B short	6 kΩ or higher
   D105-30 (CA3N) - D105-7 (AM21)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
   • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 6 CAN JUNCTION CONNECTOR) 

1. Disconnect the A18 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Purpose	Specified Condition
   A18-12 (CANP) - B51-16 (E1)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH ground short	200 Ω or higher
   A18-25 (CANN) - B51-16 (E1)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL ground short
   A18-12 (CANP) - A18-1 (BATT)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH +B short	6 kΩ or higher
   A18-25 (CANN) - A18-1 (BATT)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
   • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 6 CAN JUNCTION CONNECTOR) 

1. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Purpose	Specified Condition
   A51-35 (CA2H) - A51-28 (GND)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH ground short	200 Ω or higher
   A51-34 (CA2L) - A51-28 (GND)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL ground short
   A51-35 (CA2H) - A51-15 (BS)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANH +B short	6 kΩ or higher
   A51-34 (CA2L) - A51-15 (BS)	Cable disconnected from negative (-) auxiliary battery terminal	Inspection for CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
   • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)