3000GT AWD V6-2972cc 3.0L DOHC Turbo (1991)
Voltage
System voltage.
4. Using a volt meter, check the voltage between ISC connector harness terminal 5 and ground.
Voltage
System voltage.
5. Disconnect the ECU and ISC connectors.
6. Using an ohm meter, check for continuity between ECU harness terminal 4 and ISC harness terminal 1.
Continuity
Should exist
7. Using an ohm meter, check for continuity between ECU harness terminal 17 and ISC harness terminal 3.
Continuity
Should exist
8. Using an ohm meter, check for continuity between ECU harness terminal 5 and ISC harness terminal 4.
Continuity
Should exist
9. Using an ohm meter, check for continuity between ECU harness terminal 18 and ISC harness terminal 6.
Continuity
Should exist
10. Using an ohm meter, check for continuity between ECU harness terminal 4 and ground.
Continuity
Should not exist
11. Using an ohm meter, check for continuity between ECU harness terminal 17 and ground.
Continuity
Should not exist
12. Using an ohm meter, check for continuity between ECU harness terminal 5 and ground.
Continuity
Should not exist
13. Using an ohm meter, check for continuity between ECU harness terminal 18 and ground.
Continuity
Should not exist
If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, road
test the vehicle to confirm that the repair has corrected the problem.
If the same problem reoccurs, it is possible that there is an intermittent failure of the component or the ECU. Check for looseness at all harness
junctions and test for an intermittent failure.
