DTC U1002: Lost Communication with Gateway Module (Power Management2): Procedure

CHECK CAN BUS LINES

Turn the power switch off.

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

Fig 1: Identifying H4 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition	Result
H4-31 (CA3P) - H4-30 (CA3N)	Power switch off	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
H4-31 (CA3P) - H4-30 (CA3N)	Power switch off	54 to 69 Ω	70 Ω or higher: Open circuit in a main bus line
H4-31 (CA3P) - H4-4 (E12)	Power switch off	200 Ω or higher	Below 200 Ω: CANH ground short
H4-30 (CA3N) - H4-4 (E12)	Power switch off	200 Ω or higher	Below 200 Ω: CANL ground short

Disconnect the cable from the negative (-) battery terminal.

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
H4-31 (CA3P) - H4-7 (AM21)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
H4-30 (CA3N) - H4-7 (AM21)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

TEXT IN ILLUSTRATION

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

Result

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

B → See step 3

C → See step 9

D → See step 19

A: Go to next step

CHECK FOR DTC OUTPUT

Clear the DTCs.
Turn the power switch off.

Turn the power switch on (IG) and recheck for DTCs.

Result

Result	Proceed to
U1002 is output from power management control ECU (Techstream display/PM2 Gateway)	A
Other DTC is output	B

B → GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

A → See step 25

CHECK FOR OPEN IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)

Disconnect the power management control ECU connector.

Fig 2: Identifying H4 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H4-31 (CA3P) - H4-30 (CA3N)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

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

NG → See step 4

OK → See step 25

CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

Reconnect the power management control ECU connector.
Disconnect the wire harness connector from the CAN No. 5 junction connector front side.

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

Fig 3: Identifying H97 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H97-2 (CANH) - H97-3 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)
*b	to CAN No. 1 Junction Connector

NG → See step 6

OK: Go to next step

CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

Reconnect the wire harness connector to the CAN No. 5 junction connector front side.
Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

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

Fig 4: Identifying H98 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H98-6 (CANH) - H98-4 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)
*b	to Power Management Control ECU

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

OK → REPLACE CAN NO. 5 JUNCTION CONNECTOR

CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

Reconnect the wire harness connector to the CAN No. 5 junction connector front side.
Disconnect the instrument panel wire from the CAN No. 1 junction connector.

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

Fig 5: Identifying H112 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H112-3 (CANH) - H112-9 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*b	to CAN No. 5 Junction Connector

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

OK: Go to next step

CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - ECM)

Reconnect the instrument panel wire to the CAN No. 1 junction connector.
Disconnect the engine room main wire from the CAN No. 1 junction connector.

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

Fig 6: Identifying A57 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A57-4 (CANH) - A57-10 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*b	to ECM

NG → See step 8

OK → REPLACE CAN NO. 1 JUNCTION CONNECTOR

CHECK FOR OPEN IN CAN BUS LINES (ECM)

Reconnect the engine room main wire to the CAN No. 1 junction connector.
Disconnect the ECM connector.

Fig 7: Identifying A60 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A60-12 (CANP) - A60-4 (CANN)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

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

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)

OK → See step 24

CHECK FOR SHORT IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)

Disconnect the power management control ECU connector.

Fig 8: Identifying H4 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H4-31 (CA3P) - H4-30 (CA3N)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

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

NG → See step 10

OK → See step 25

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

Reconnect the power management control ECU connector.
Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

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

Fig 9: Identifying H98 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H98-6 (CANH) - H98-4 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)
*b	to Power Management Control ECU

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

Disconnect the wire harness connector from the CAN No. 5 junction connector front side.

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

Fig 10: Identifying H97 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H97-2 (CANH) - H97-3 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)
*b	to CAN No. 1 Junction Connector

NG → See step 14

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

Disconnect the air conditioning amplifier assembly connector.

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

Fig 11: Identifying H98 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H98-5 (CANH) - H98-3 (CANL)	Power switch off	1 MΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)
*b	to Air Conditioning Amplifier Assembly

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

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

Fig 12: Identifying H85 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H85-11 (CANH) - H85-12 (CANL)	Power switch off	54 to 69 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

NG → REPLACE CAN NO. 5 JUNCTION CONNECTOR

OK → See step 26

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.
Disconnect the instrument panel wire from the CAN No. 1 junction connector.

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

Fig 13: Identifying H112 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
H112-3 (CANH) - H112-9 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*b	to CAN No. 5 Junction Connector

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - ECM)

Disconnect the engine room main wire from the CAN No. 1 junction connector.

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

Fig 14: Identifying A57 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A57-4 (CANH) - A57-10 (CANL)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*b	to ECM

NG → See step 18

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - SKID CONTROL ECU)

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

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

Fig 15: Identifying A57 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A57-3 (CANH) - A57-9 (CANL)	Power switch off	1 MΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*b	to Skid Control ECU

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 1 J/C - SKID CONTROL ECU)

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU)

Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.

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

Fig 16: Identifying A61 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A61-35 (CA2H) - A61-34 (CA2L)	Power switch off	54 to 69 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Skid Control ECU)

NG → REPLACE CAN NO. 1 JUNCTION CONNECTOR

OK → See step 27

CHECK FOR SHORT IN CAN BUS LINES (ECM)

Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.
Disconnect the ECM connector.

Fig 17: Identifying A60 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A60-12 (CANP) - A60-4 (CANN)	Power switch off	108 to 132 Ω

TEXT IN ILLUSTRATION

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

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)

OK → See step 24

CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C)

Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

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

Fig 18: Identifying H44 And H98 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Condition	Purpose	Connected to
H98-6 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	Power management control ECU
H98-4 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short	Power management control ECU
H98-5 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	Air conditioning amplifier assembly
H98-3 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short	Air conditioning amplifier assembly
H98-6 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short	Power management control ECU
H98-4 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short	Power management control ECU
H98-5 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short	Air conditioning amplifier assembly
H98-3 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short	Air conditioning amplifier assembly

TEXT IN ILLUSTRATION

*1	DLC3	-	-
*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)	*b	to Air Conditioning Amplifier Assembly
*c	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 Power Management Bus inspection.

NG → See step 23

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C MAIN LINE)

Disconnect the wire harness connector from the CAN No. 5 junction connector front side.

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

Fig 19: Identifying H44 And H97 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Condition	Purpose	Connected to
H97-2 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	CAN No. 1 junction connector
H97-3 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short
H97-2 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
H97-3 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

TEXT IN ILLUSTRATION

*1	DLC3	-	-
*a	Front view of wire harness connector (to CAN No. 5 Junction Connector)	*b	to CAN No. 1 Junction Connector

HINT:

It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.

NG → See step 21

OK → REPLACE CAN NO. 5 JUNCTION CONNECTOR

CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 1 J/C)

Disconnect the instrument panel wire from the CAN No. 1 junction connector.

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

Fig 20: Identifying H44 And H112 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Condition	Purpose	Connected to
H112-3 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	CAN No. 5 junction connector
H112-9 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short
H112-3 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
H112-9 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

TEXT IN ILLUSTRATION

*1	DLC3	-	-
*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)	*b	to CAN No. 5 Junction Connector

HINT:

It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.

NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

OK: Go to next step

CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 1 J/C)

Disconnect the engine room main wire from the CAN No. 1 junction connector.

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

Fig 21: Identifying H44 And A57 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Condition	Purpose	Connected to
A57-3 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	Skid control ECU
A57-9 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short	Skid control ECU
A57-4 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANH ground short	ECM
A57-10 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher	Inspection for CANL ground short	ECM
A57-3 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short	Skid control ECU
A57-9 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short	Skid control ECU
A57-4 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short	ECM
A57-10 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short	ECM

HINT:

It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.

TEXT IN ILLUSTRATION

*1	DLC3	-	-
*a	Front view of wire harness connector (to CAN No. 1 Junction Connector)	*b	to Skid Control ECU
*c	to ECM	-	-

B → See step 23

OK → REPLACE CAN NO. 1 JUNCTION CONNECTOR

CHECK CAN BUS LINE (ECU)

Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to B+ or shorted to GND is connected.

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

Fig 22: Identifying H4 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Condition	Purpose
H4-31 (CA3P) - H4-4 (E12)	Power switch off	200 Ω or higher	Below 200 Ω: CANH ground short
H4-30 (CA3N) - H4-4 (E12)	Power switch off	200 Ω or higher	Below 200 Ω: CANL ground short
H4-31 (CA3P) - H4-7 (AM21)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
H4-30 (CA3N) - H4-7 (AM21)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

TEXT IN ILLUSTRATION

*a	Component with harness connector (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 Power Management Bus inspection.

NG → REPAIR OR REPLACE CORRESPONDING ECU WIRE

OK → REPLACE CORRESPONDING ECU

REPLACE ECM. Refer to REMOVAL [08/2012 - ]
REPLACE POWER MANAGEMENT CONTROL ECU. Refer to REMOVAL [08/2012 - ]
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [08/2012 - ]
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU). Refer to REMOVAL [08/2012 - ]