FAILURE DIAGNOSIS
1-204
TNV DI Service Manual
Method and Procedure of Failure Diagnosis
Work Description
1. Battery voltage check:
• During the engine running, connect the diagnosis tool and log in to the diagnosis tool.
• Check the battery voltage with the diagnosis tool “Diagnosis Test: Pulse/analog etc.”.
2. Check of harness continuity:
• Check the harness continuity using a circuit tester.
Voltage
Status
Action
Approx.12[V]
≤
battery voltage < 16[V]
OK
(normal range)
Check the harness for correct continuity.
10.5[V]
≤
battery voltage < approx.12[V]
NG
• Charge or replace the battery.
• Check the movement of other E-ECUs.
NG
• Charge or replace the battery.
• Check the movement of other E-ECUs.
OK
Check the harness for correct continuity.
→
Go to [2. Check of harness continuity:]
Terminal
Continuity
Status
CAN wiring (Hi side) E40
(Between E-ECU and sensor connector)
Available
OK: normal
Unavailable
NG: harness disconnection
CAN wiring (Low side) E39
(Between E-ECU and sensor connector)
Available
OK: normal
Unavailable
NG: harness disconnection
Between E39/E40 and
GND/E28/E45/E47
Unavailable
OK: normal
Available
NG: harness short-circuited with GND
NG
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
OK
• Check the movement of other E-ECUs.
• Replace the E-ECU.
TNV_DI_SM_A4-Troubleshooting.book 204 ページ 2007年11月15日 木曜日 午後5時27分