DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM)
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
CONNECT CONNECTOR
CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR)
CONNECT CONNECTOR
CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 1 JUNCTION CONNECTOR)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (ECM)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND GROUND)
DTC U1002 Lost Communication with Gateway Module (Power Management2) |
DESCRIPTION
- The power management control ECU stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the power management bus.
- When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management control ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the power management bus, the power management control ECU determines that a malfunction exists.
- If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).
DTC Code
| DTC Detection Condition
| Trouble Area
|
U1002
| Lost communication with the gateway module (Power Management2).
| - Power management bus circuit
- Air conditioning amplifier assembly branch wire or connector
- Power management control ECU main wire or connector
- ECM main wire or connector
- Air conditioning amplifier assembly
- Power management control ECU
- ECM
- No. 1 junction connector
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- HINT:
- Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
| 1.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.
- CAUTION:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.
- NOTICE:
- After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
| 2.CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
| Resistance: Malfunction
|
G51-12 (CA3P) - G51-11 (CA3N)
| Engine switch off
| 54 to 69 Ω
| Below 53 Ω: Short in line
|
G51-12 (CA3P) - G51-11 (CA3N)
| Engine switch off
| 54 to 69 Ω
| Higher than 70 Ω: Open in CAN main bus line
|
G51-12 (CA3P) - G51-1 (AM22)
| Engine switch off
| 6 kΩ or higher
| Below 6 kΩ: +B short
|
G51-11 (CA3N) - G51-1 (AM22)
| Engine switch off
| 6 kΩ or higher
| Below 6 kΩ: +B short
|
G51-12 (CA3P) - G51-6 (GND)
| Engine switch off
| 200 Ω or higher
| Below 200 Ω: Ground short
|
G51-11 (CA3N) - G51-6 (GND)
| Engine switch off
| 200 Ω or higher
| Below 200 Ω: Ground short
|
Text in Illustration*a
| Component with harness connected
(Power Management Control ECU)
|
ResultResult
| Proceed to
|
NG
- Open in CAN main bus line
| A
|
NG
- Short in line
- +B short
- Ground short
| B
|
OK
| C
|
| 3.CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM) |
Disconnect the G98 No. 1 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G98-9 (CANH) - G98-20 (CANL)
| Engine switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 1 Junction Connector)
|
| 4.CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G98-11 (CANH) - G98-22 (CANL)
| Engine switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 1 Junction Connector)
|
| OK |
|
|
|
| REPLACE NO. 1 JUNCTION CONNECTOR |
|
Reconnect the G98 No. 1 junction connector.
| 6.CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR) |
Disconnect the G56*1 or G57*2 ECM connector.
- *1: for 1GR-FE and Manual Transmission System
- *2: for 1KD-FTV
Text in Illustration*A
| for 1GR-FE and Manual Transmission System
| *B
| for 1KD-FTV
|
*a
| Front view of wire harness connector
(to ECM)
| -
| -
|
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for 1GR-FE and Manual Transmission SystemTester Connection
| Switch Condition
| Specified Condition
|
G56-34 (CANP) - G56-33 (CANN)
| Engine switch off
| 108 to 132 Ω
|
for 1KD-FTVTester Connection
| Switch Condition
| Specified Condition
|
G57-20 (CANP) - G57-21 (CANN)
| Engine switch off
| 108 to 132 Ω
|
ResultResult
| Proceed to
|
OK (for 1GR-FE)
| A
|
OK (for 1KD-FTV)
| B
|
NG
| C
|
| |
|
| | REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 1 JUNCTION CONNECTOR) |
|
|
Reconnect the G98 No. 1 junction connector.
| 8.CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 1 JUNCTION CONNECTOR) |
Disconnect the G51 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G51-12 (CA3P) - G51-11 (CA3N)
| Engine switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to Power Management Control ECU)
|
| | REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - NO. 1 JUNCTION CONNECTOR) |
|
|
| 9.CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
Disconnect the G98 No. 1 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G98-10 (CANH) - G98-21 (CANL)
| Engine switch off
| 200 Ω or higher
|
G98-10 (CANH) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-21 (CANL) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-10 (CANH) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G98-21 (CANL) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 1 Junction Connector)
|
*b
| Front view of DLC3
|
| 10.CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G98-9 (CANH) - G98-20 (CANL)
| Engine switch off
| 108 to 132 Ω
|
G98-9 (CANH) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-20 (CANL) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-9 (CANH) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G98-20 (CANL) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 1 Junction Connector)
|
*b
| Front view of DLC3
|
| 11.CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G98-11 (CANH) - G98-22 (CANL)
| Engine switch off
| 108 to 132 Ω
|
G98-11 (CANH) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-22 (CANL) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G98-11 (CANH) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G98-22 (CANL) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 1 Junction Connector)
|
*b
| Front view of DLC3
|
| OK |
|
|
|
| REPLACE NO. 1 JUNCTION CONNECTOR |
|
Reconnect the G98 No. 1 junction connector.
| 13.CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY) |
Disconnect the G25 air conditioning amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G25-11 (CANH) - G25-12 (CANL)
| Engine switch off
| 54 to 69 Ω
|
G25-11 (CANH) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G25-12 (CANL) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G25-11 (CANH) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G25-12 (CANL) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)
|
*b
| Front view of DLC3
|
| | REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL) |
|
|
Reconnect the G98 No. 1 junction connector.
| 15.CHECK FOR SHORT IN CAN BUS WIRES (ECM) |
for 1GR-FE and Manual Transmission System:
Disconnect the G56 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G56-34 (CANP) - G56-33 (CANN)
| Engine switch off
| 108 to 132 Ω
|
G56-34 (CANP) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G56-33 (CANN) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G56-34 (CANP) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G56-33 (CANN) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to ECM)
|
*b
| Front view of DLC3
|
for 1KD-FTV:
Disconnect the G57 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G57-20 (CANP) - G57-21 (CANN)
| Engine switch off
| 108 to 132 Ω
|
G57-20 (CANP) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G57-21 (CANN) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G57-20 (CANP) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G57-21 (CANN) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Front view of wire harness connector
(to ECM)
|
*b
| Front view of DLC3
|
ResultResult
| Proceed to
|
OK (for 1GR-FE)
| A
|
OK (for 1KD-FTV)
| B
|
NG
| C
|
| |
|
| | REPAIR OR REPLACE ECM MAIN WIRE OR CONNECTOR (CANP, CANN) |
|
|
Reconnect the G98 No. 1 junction connector.
| 17.CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU) |
Disconnect the G51 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G51-12 (CA3P) - G51-11 (CA3N)
| Engine switch off
| 108 to 132 Ω
|
G51-12 (CA3P) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G51-11 (CA3N) - G48-4 (CG)
| Engine switch off
| 200 Ω or higher
|
G51-12 (CA3P) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
G51-11 (CA3N) - G48-16 (BAT)
| Engine switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to Power Management Control ECU)
|
*b
| Front view of DLC3
|
| | REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU MAIN WIRE OR CONNECTOR (CA3P, CA3N) |
|
|
| 18.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND GROUND) |
Connect the cable to the negative (-) battery terminal.
- NOTICE:
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
Disconnect the G51 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
G51-5 (GND2) - Body ground
| Always
| Below 1 Ω
|
G51-6 (GND) - Body ground
| Always
| Below 1 Ω
|
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
G51-1 (AM22) - Body ground
| Always
| 11 to 14 V
|
G51-2 (AM21) - Body ground
| Always
| 11 to 14 V
|
Text in Illustration*a
| Rear view of wire harness connector
(to Power Management Control ECU)
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
