Test NF-7A - Checking Idle Speed Motor Operation
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For wiring diagram, see WIRING DIAGRAMS
at end of article.
- Using DRB-II, set engine speed to 1100 RPM. If engine speed can be set to 1050-1150 RPM, test is complete. If engine speed cannot be set to 1050-1150 RPM, return engine to normal idle speed. Disconnect and inspect idle speed motor connector. Repair connector if damaged. Perform VERIFICATION TEST VER-2 .
- If connector is okay, place DRB-II in voltmeter mode. Open and close throttle while probing Gray/Red wire (Dark Green/Black wire on Wrangler) at idle speed motor connector. If voltage is less than one volt, perform TEST NF-7B . If voltage is more than one volt, go to next step.
- Open and close throttle while probing Yellow/Black wire (Pink/Black wire on Wrangler) at idle speed motor connector. If voltage is less than one volt, perform TEST NF-7B . If voltage is more than one volt, go to next step.
- Open and close throttle while probing Brown/White wire (Red/Yellow wire on Wrangler) at idle speed motor connector. If voltage is less than one volt, perform TEST NF-7B . If voltage is more than one volt, go to next step.
- Open and close throttle while probing Violet/Black wire (Dark Blue/Yellow wire on Wrangler) at idle speed motor connector. If voltage is less than one volt, perform TEST NF-7B . If voltage is more than one volt, inspect engine for vacuum leaks. Repair vacuum leaks as necessary. Perform VERIFICATION TEST VER-2 . If no vacuum leaks exist, replace idle speed motor. Perform VERIFICATION TEST VER-2 .