1) Connect the scan tool.
2) Power up the scan tool. Does the scan tool power up?
Yes
=>Go to TCM communication verification.
No
Go to Scan tool does not power up.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Scan tool does not power up".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".
1) Check the communication status with the TCM using the scan tool. Is communication with the TCM established?
Yes
Go to Intermittent conditions of transfer case control system.
Refer to "206.Transmission, Transaxle 19D.Symptom(AWR6B45) Intermittent conditions of automatic transmission".
No
=>Go to Central gateway control unit communication verification.
1) Verify communication with the central gateway control unit using the scan tool. Can communication with the central gateway control unit be established?
Yes
=>Go to Powertrain CAN communication circuit communication verification.
No
Go to Lost communication with the central gateway control unit.
1) Verify that communication can be established with the following control modules using a scan tool. Can communication with all the control modules be established?
Yes
=>Go to TCM harness connector inspection.
No
Go to Powertrain CAN communication circuit inspection.
Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) powertrain CAN communication circuit inspection".
1) Turn OFF the ignition switch.
2) Inspect for poor connections at the TCM harness connector (E5 and E7). Is the connection status normal?
Refer to "LHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
No
Repair the connections as necessary.
1) Inspect the following fuses for a blowout. Is the result normal?
Yes
=>Go to Inspection for open circuit in battery power supply circuit.
No
Replace the fuse. If the fuse blows out again, repair the short to ground in the circuits relating to that fuse.
1) Turn OFF the ignition switch.
2) Disconnect the TCM harness connector (E5).
3) Connect a test lamp between the battery power supply circuit (pin 10 of E5) and the body ground.
Refer to "LHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
4) Turn ON the ignition switch. Does the test lamp illuminate?
Yes
=>Go to Inspection for open circuit in ground circuit.
No
Repair the open circuit or high resistance in the ignition power supply circuit between the TCM/DRM 5A fuse and the TCM (pin 21 of E5).
1) Connect a test lamp between the battery power supply circuit and the ground circuit (pins 1 and 10 of E5).
Refer to "LHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Automatic Transmission" in the ETM (wiring diagram). (Open using the ETM viewer.).
2) Turn ON the ignition switch. Does the test lamp illuminate?
Yes
=>Go to TCM ground inspection.
No
Repair the open circuit or high resistance in the ground circuit between the TCM (pin 1 of E5) and the body ground.
1) Inspect the TCM ground section for corrosion or improper installation. Is the result normal?
Yes
=>Go to Inspection for open circuit and short circuit in CAN circuit.
No
Repair the ground point as necessary.
1) Inspect for poor connections at the CAN circuit junction connector between the TCM (pins 1 and 2 of E7) and the DLC (pins 6 and 14 of C19). Is the connection status normal?
2) Inspect the CAN High circuit and CAN Low circuit between the TCM (pins 1 and 2 of E7) and the DLC (pins 6 and 14 of C19) for the following. Is the result normal?
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
3) Are all of the results normal?
Yes
No
Repair the circuit or connection as necessary.
Note
Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM removal".
Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM installation".
Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM setting".
Procedure completion
1) Turn OFF the ignition switch.
2) Reconnect the disconnected harness connectors.
3) Turn ON the ignition switch.
4) Check the communication status with the TCM using the scan tool. Is communication with the TCM established?
Yes
The system is normal.
No