Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".
1) Connect the scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Start the engine.
4) Observe the DTC information with a scan tool. Is DTC U0001 set at the same time?
Yes
Go to DTC U0001 diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U0001 (Flash Code 84) High Speed CAN Communication Bus".
No
=>Go to TCM communication verification.
1) Check the communication status with the TCM using the scan tool. Is communication with the TCM established?
Yes
=>Go to TCM-related DTC check.
No
Go to Lost communication with the TCM.
1) Observe the TCM-related DTC information on the scan tool. Is a TCM-related DTC set?
Yes
Go to the applicable DTC diagnosis.
No
=>Go to TCM harness connector inspection.
1) Inspect for poor connections at the TCM harness connector (pins 1 and 2 of E7). Is the connection status normal?
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes (Models with radar sensors/stereo cameras)
=>Go to Central gateway control unit internal resistance inspection.
Yes (Models without radar sensors and stereo cameras)
=>Go to Instrument panel cluster internal resistance inspection.
No
Repair the connections as necessary.
1) Disconnect the ECM harness connector (C7).
2) Measure the resistance of the ECM harness connector (pins 58 and 78 of C7) with a DMM. Is the resistance within the specified range?
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Value: 110 to 130 Ω
Yes
=>Go to ECM internal resistance inspection (Models with radar sensors/stereo cameras).
No
=>Go to Central gateway control unit replacement.
1) Disconnect the ECM harness connector (C7).
2) Measure the resistance of the ECM harness connector (pins 58 and 78 of C7) with a DMM. Is the resistance within the specified range?
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Value: 110 to 130 Ω
Yes
=>Go to ECM internal resistance inspection (Models without radar sensors and stereo cameras).
No
=>Go to Instrument panel cluster replacement.
1) Disconnect the central gateway control unit harness connector (B41).
2) Measure the resistance of the central gateway control unit harness connector (pins 5 and 6 of B41) with a DMM. Is the resistance within the specified range?
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Value: 110 to 130 Ω
Yes
=>Go to CAN communication circuit inspection.
No
1) Disconnect the instrument panel cluster harness connector (B7).
2) Measure the resistance of the instrument panel cluster harness connector (pins 21 and 22 of B7) with a DMM. Is the resistance within the specified range?
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Value: 110 to 130 Ω
Yes
=>Go to CAN communication circuit inspection.
No
Inspect the CAN Low circuit and CAN High circuit between the ECM and the TCM for the following.
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Are all of the results normal?
Yes
No
Repair the circuit as necessary.
Note
Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM removal".
Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM installation".
Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM setting".
Procedure completion
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
Note
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit setting".
Procedure completion
Note
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster removal".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster installation".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.