Pinpoint Test ISC - Idle Speed Control
NOTE:
Enter this test only when a Code 34 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
ISC CIRCUIT PIN IDENTIFICATION
| Circuit | ECA Pin | BOB Pin | Wire Color | |
|---|---|---|---|---|
| ISC | ||||
| 1.3L | 2W | 41 | RED/BLK | |
| 1.6L | 2Q | 41 | GRN | |
- Install BOB, leaving ECA disconnected. Turn ignition on. Connect a jumper between BOB test pin No. 41 and ground. Listen for clicking sound from solenoid, mounted on throttle body. If clicking sound occurs, ISC solenoid is okay; return to QUICK TESTS if sent here from there. If no clicking sound occurs, go to next step.
- Unplug ISC solenoid connector. With ignition on, measure voltage between VPWR wire and ground. If voltage is less than 10 volts, repair VPWR wire to main relay. Go to next step if voltage is not less than 10 volts.
- Measure voltage between ISC solenoid VPWR wire and solenoid connector SIG wire while cranking engine. Replace solenoid if voltage is more than 10 volts only when engine is cranking. If okay, go to next step.
- With BOB installed and ECA disconnected, unplug ISC solenoid connector. Check for continuity between BOB SIG test pin and ISC connector SIG wire. If resistance is not less than 5 ohms, repair ISC wire between solenoid and ECA. If okay, go to next step.
- With BOB installed and ECA disconnected, measure resistance between BOB SIG test pin and all other test pins. If resistance is less than 5 ohms, repair short in SIC wire to ECA. If resistance is not less than 5 ohms, replace ECA.