DTC U171F Lost Lin Communication With Generator: Notes
WARNING: This page is about a different variant/trim than selected.
DTC detecting condition:
Immediately at fault recognition
CAUTION:
- After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode .
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Charging System Ref. to WIRING SYSTEM>Charging System .
- CHECK DTC.
Check for DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Read Diagnostic Trouble Code (DTC) .
Is U171F displayed in [DTC]?
- Yes: Go to 2.
- No: Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
- CHECK ECM CONNECTOR.
Check the connecting condition of ECM connector.
Is the ECM connector correctly connected?
- Yes: Go to 3.
- No: Connect the ECM connector correctly.
- CHECK VOLTAGE OF GENERATOR B TERMINAL.
- Turn the ignition switch to OFF.
- Disconnect the ground terminal from battery sensor. Ref. to NOTE>NOTE>BATTERY .
- Measure the voltage of the generator B terminal.
Connector & terminal
Generator B terminal - Engine ground:
Is it battery voltage?
- Yes: Go to 4.
- No: Check the generator B terminal harness and fuse.
- CHECK HARNESS BETWEEN ECM AND GENERATOR CONNECTOR.
- Disconnect the connector from ECM.
- Disconnect the LIN communication connector from the generator.
- Measure the resistance of harness between ECM and generator LIN communication connector.
Connector & terminal
(B134) No. 23 - (F26) No. 3:
Is the resistance less than 1 Ω?
- Yes: Check the connector for poor contact and check the harness. If no fault is found, replace the generator. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Generator .
- No: repair the harness and connector.NOTE: In this case, repair the following item:
- Open circuit of harness between ECM connector and generator
- Poor contact of coupling connector