Frontier & Xterra
- If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
- Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See CHECKING START SIGNAL (FRONTIER & XTERRA) table. If start signal displays as specified, go to step 7. If start signal does not display as specified, go to step 4.CHECKING START SIGNAL (FRONTIER & XTERRA)
Condition Start Signal Ignition Switch ON OFF Ignition Switch START ON - Backprobing at ECM, measure voltage between ground and ECM terminal No. 20 (Blue/Orange wire). See Figure and Figure . Turn ignition switch to START position. Battery voltage should exist. With ignition switch in any other position, about zero volts should exist. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
- Check fuse block fuse No. 7 (7.5-amp). Fuse block is located under left side of instrument panel. Replace fuse, if necessary. If fuse is okay, go to next step.
- Turn ignition off. Disconnect ECM 124-pin harness connector. For ECM location, see Figure. Remove fuse block fuse No. 7. Check continuity between ECM harness connector terminal No. 20 (Blue/Orange wire) and fuse No. 7 socket cavity. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If no problem is found, go to step 7.
- Check the following:
- Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M81 and F36. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors M26.
- Check for open or short in wire between ECM and fuse block.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.