Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Diagnostic system check-engine controls".
1) Connect the scan tool.
2) Turn OFF the ignition switch for 1 minute or more.
3) Start the engine.
4) Observe the DTC information with a scan tool. Is DTC U0074 set at the same time?
Yes
Go to DTC U0074 diagnosis.
No
=>Go to Inspection for open circuit in CAN circuit.
1) Turn OFF the ignition switch.
2) Disconnect the turbocharger internal control unit harness connector (E17).
3) Turn ON the ignition switch.
4) Measure the voltage between the CAN High circuit (pin 4 of E17) and the frame ground with a DMM. Is the voltage within the specified range?
5) Measure the voltage between the CAN Low circuit (pin 3 of E17) and the frame ground with a DMM. Is the voltage within the specified range?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Value: 1.5 to 3.5 V
6) Are all of the values normal?
Yes
=>Go to Inspection for open circuit in turbocharger internal control unit power supply circuit.
No
Repair the open circuit or high resistance in the CAN High circuit and CAN Low circuit between the turbocharger internal control unit (pins 3 and 4 of E17) and the intermediate connector.
1) Connect a test lamp between the ignition power supply circuit (pin 1 of E17) and the frame ground. Does the test lamp illuminate?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Inspection for open circuit in turbocharger internal control unit GND circuit.
No
Repair the open circuit or high resistance in the ignition power supply circuit between the ENGINE 15A fuse and the turbocharger internal control unit (pin 1 of E17). Inspect the ENGINE 15A fuse first.
1) Connect a test lamp between the ignition power supply circuit and the ground circuit (pins 1 and 2 of E17). Does the test lamp illuminate?
Yes
=>Go to Turbocharger internal control unit harness connector inspection.
No
Repair the open circuit or high resistance in the ground circuit between the turbocharger internal control unit (pin 2 of E17) and the frame ground, and re-tighten or clean the corroded area as necessary.
1) Inspect for poor connections at the turbocharger internal control unit harness connector (pins 1 and 2 of E17). Is the connection status normal?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Turbocharger replacement.
No
Repair the connections as necessary.
Refer to "1.Engine 1F.Induction(4JJ3 without DPD) Turbocharger removal".
Refer to "1.Engine 1F.Induction(4JJ3 without DPD) Turbocharger installation".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 1 minute or more.
3) Start the engine.
4) Operate the vehicle under the conditions for running the DTC.
5) Observe the DTC information with a scan tool.