Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Diagnostic system check-engine controls".
1) Observe the Fuel Temperature Sensor parameter on the scan tool. Is the Fuel Temperature Sensor parameter more than or equal to the specified value?
Value: 4.8 V
Yes
=>Go to Fuel temperature sensor signal output voltage check.
No
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
1) Turn OFF the ignition switch.
2) Disconnect the fuel temperature sensor harness connector (C50).
3) Turn ON the ignition switch.
4) Measure the voltage between the fuel temperature sensor signal circuit (pin 2 of C50) and the body ground with a DMM.
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: 4.5 to 5.5 V
The reading is more than the specified value.
=>Go to Inspection for short to power supply in fuel temperature sensor signal circuit.
The reading is within the specified range.
=>Go to Fuel temperature sensor signal voltage check using fused jumper wire.
The reading is less than the specified value.
=>Go to Inspection for open circuit in fuel temperature sensor signal circuit.
1) Connect a fused jumper wire between the signal circuit and the low reference circuit of the fuel temperature sensor (pins 1 and 2 of C50).
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.).
2) Observe the Fuel Temperature Sensor parameter on the scan tool. Is the Fuel Temperature Sensor parameter less than or equal to the specified value?
Value: 0.1 V
Yes
=>Go to Inspection for short to 5 V reference in fuel temperature sensor signal circuit.
No
=>Go to Inspection for open circuit in fuel temperature sensor low reference circuit.
1) Inspect the signal circuit between the ECM (pin 31 of C10) and the fuel temperature sensor (pin 2 of C50) for a short to the battery power supply circuit or a short to the ignition power supply circuit. Is the result normal?
Note
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
No
Repair the circuit as necessary.
1) Inspect the signal circuit between the ECM (pin 31 of C10) and the fuel temperature sensor (pin 2 of C50) for an open circuit or high resistance. Is the result 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 ECM harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect the low reference circuit between the ECM (pin 17 of C9) and the fuel temperature sensor (pin 1 of C50) for an open circuit or high resistance. Is the result normal?
Caution
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 ECM harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect the signal circuit between the ECM (pin 31 of C10) and the fuel temperature sensor (pin 2 of C50) for a short to the 5 V reference circuit. Is the result 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 Fuel temperature sensor harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the fuel temperature sensor harness connector (pins 1 and 2 of C50). 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
Replace the fuel temperature sensor.
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) fuel temperature sensor removal".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) fuel temperature sensor installation".
No
Repair the connections as necessary.
1) Inspect for poor connections at the ECM harness connector (pin 17 of C9 and pin 31 of C10). 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
No
Repair the connections as necessary.
Note
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM removal".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM installation".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM setting".
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.