Caution
1) Connect the scan tool.
2) Power up the scan tool. Does the scan tool power up?
Yes
=>Go to Central gateway control unit 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) Turn ON the ignition switch.
2) Verify that communication can be established with the central gateway control unit using a scan tool. Can communication with the central gateway control unit be established?
Yes
The system is normal.
No
1) Inspect for poor connections at the DLC (pins 6 and 14 of C19). Is the connection status 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.).
Yes
No
Repair the connections as necessary.
1) Inspect the following fuses for a blowout. Is the result normal?
Yes
=>Go to Central gateway control unit harness connector inspection.
No
Replace the fuse. If the fuse blows out again, repair the short to ground in the circuit relating to each fuse.
1) Inspect for poor connections at the central gateway control unit harness connector (pins 7, 8, 15, 16, 31, and 32 of B41). Is the connection status 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.).
Yes
=>Go to Inspection for open circuit in central gateway control unit battery power supply circuit.
No
Repair the connections as necessary.
1) Disconnect the central gateway control unit harness connector (B41).
2) Connect a test lamp between the battery power supply circuit (pin 32 of B41) and the body ground. Does the test lamp illuminate?
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.).
Yes
=>Go to Inspection for open circuit in central gateway control unit ignition power supply circuit.
No
Repair the open circuit or high resistance in the battery power supply circuit between the CGW(+B) 5A fuse and the central gateway control unit (pin 32 of B41).
1) Connect a test lamp between the ignition power supply circuit (pin 16 of B41) and the body ground.
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.).
2) Turn ON the ignition switch. Does the test lamp illuminate?
Yes
=>Go to Inspection for open circuit in central gateway control unit ground circuit.
No
Repair the open circuit or high resistance in the ignition power supply circuit between the CGW(IG1) 5A fuse and the central gateway control unit (pin 16 of B41).
1) Connect a test lamp between the battery power supply circuit (pin 32 of B41) and the ground circuit (pins 15 and 31 of B41). Does the test lamp illuminate?
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.).
Yes
=>Go to Diagnostic CAN communication circuit inspection.
No
Repair the open circuit or high resistance in the ground circuit between the central gateway control unit (pins 15 and 31 of B41) and the body ground.
1) Inspect the CAN Low circuit and CAN High circuit between the central gateway control unit (pins 7 and 8 of B41) 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.).
Yes
=>Go to Diagnostic CAN communication circuit resistance check.
No
Repair the circuit as necessary.
1) Turn OFF the ignition switch.
2) Connect the central gateway control unit harness connector (B41).
3) Disconnect the scan tool from the DLC (C19) if connected.
4) Measure the resistance between the CAN Low circuit and the CAN High circuit (pins 6 and 14 of C19) with a DMM. Is the resistance within the specified range?
Note
Value: 50 to 70 Ω
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.).
Yes
No
=>Go to CAN resistor inspection.
1) Disconnect the central gateway control unit harness connector (B41).
2) Measure the resistance at the CAN resister (pins 9 and 14 of C3) from the backside of the Fuse and Relay Box (Instrument Panel) harness connector with a DMM. Is the resistance within the specified range?
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.).
Value: 110 to 130 Ω
Yes
=>Go to Central gateway control unit replacement.
No
Replace the CAN resistor.
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
1) Securely connect the disconnected harness connectors.
2) Connect the scan tool.
3) Turn ON the ignition switch.
4) Verify that communication can be established with the central gateway control unit using a scan tool. Can communication with the central gateway control unit be established?
Yes
The system is normal.
No
=>Go to Central gateway control unit harness connector inspection.