FAILURE DIAGNOSIS
1-138
TNV DI Service Manual
Method and Procedure of Failure Diagnosis
Diagnosis Description
1. Check of the input voltage of the rack position sensor (h E-ECU)
• Turn the key switch off, and remove the rack actuator connector from the fuel injection pump. At this
time, keep the E-ECU connector being connected to E-ECU.
• Turn the key switch on to turn on the E-ECU power.
• Measure the voltage between sensor terminal E43 and E28 using a circuit tester.
2. Check of harness continuity:
• Remove the rack actuator connector and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Normal value
Sensor connector E43 - E28
Equivalent to the battery voltage
NG
Check the harness for correct continuity.
→
Go to [2. Check of harness continuity:]
OK
Check if the “Directive rack position control” is executable using the diagnosis tool
“Diagnosis Test: Active control”.
→
Go to [3. Execution check of the directive rack
position control:]
Terminal
Continuity
Status
Sensor signal wire E36
[Between E-ECU and sensor connector]
Available
OK: normal
Unavailable NG: harness disconnection
Sensor GND wire E28
[Between E-ECU and sensor connector]
Available
OK: normal
Unavailable NG: harness disconnection
Sensor 12V wire E43
[Between E-ECU and sensor connector]
Available
OK: normal
Unavailable NG: harness disconnection
Between E36 and other terminal/GND
and between E43 and other
terminal/GND
Unavailable OK: normal
Available
NG: harness short-circuited with GND
Between E28 and GND/E45/E47
Available
OK: normal
Unavailable NG: harness disconnection
Between E28 and other terminals
Unavailable OK: normal
Available
NG: harness short-circuited with another
wiring
NG
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
OK
Check if the “Directive rack position control” is executable using the diagnosis tool
“Diagnosis Test: Active control”.
→
Go to [3. Execution check of the directive rack
position control:]
TNV_DI_SM_A4-Troubleshooting.book 138 ページ 2007年11月15日 木曜日 午後5時27分