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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Engine Controls - Tests W/Codes - 4.0L) >> No-Start Tests >> Test NS-1A - Qualifying No-Start Condition

Test NS-1A - Qualifying No-Start Condition

WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: When checking for spark, Powertrain Control Module (PCM) damage may occur if spark plug cable is held more than 1/4" away from ground.
NOTE: Perform a visual inspection before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION  at beginning of article. For wiring diagrams, see WIRING DIAGRAMS  at the end of this article. Perform TEST VER-1A after each repair.
  1. Attempt to crank engine. If engine will not crank, go to TEST NS-9A  . If engine will crank, turn ignition off. Disconnect any one spark plug cable at spark plug. Insert an insulated screwdriver in spark plug cable terminal. Hold screwdriver within 1/4" of ground.
    NOTE: When checking for spark, consider one or 2 sparks as a no-spark condition.
  2. Crank engine for 10 seconds and watch for ignition spark. If a good spark occurs, go to TEST NS-2A  . If a good spark does not occur, turn ignition off. Disconnect coil secondary cable from distributor. Hold coil cable within 1/4" of a good ground. Crank engine for 10 seconds and watch for ignition spark. If there is not a good spark, go to next step. If good spark occurs, repair or replace distributor cap, rotor or spark plug cables as necessary.
  3. Turn ignition off. Remove coil cable from coil. Using an external ohmmeter, check resistance of coil cable. Resistance should be 250-1000 ohms per inch. If resistance is more than 15,000 ohms, replace coil cable. If resistance is less than 15,000 ohms, go to next step.
  4. Turn ignition off. Remove distributor cap and crank engine. If distributor rotor turns, go to next step. If distributor rotor does not turn, repair distributor drive system as necessary.
  5. Install distributor cap and coil cable. Disconnect ignition coil connector and ensure connector is clean and not damaged. If ignition coil connector terminals are okay, go to next step.
  6. Turn ignition on. Using scan tool, run ASD fuel system actuation test. While actuating fuel system, put scan tool in voltmeter mode. Check voltage in ASD relay output circuit at coil connector terminal No. 1 (Dark Green/Orange wire on XJ and YJ bodies or Dark Green/Black wire on ZJ body). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in ASD relay output circuit.
  7. Using scan tool in voltmeter mode, check voltage in ignition coil driver circuit at coil connector terminal No. 2 (Black/Gray wire on XJ body, Gray wire on YJ body, or Gray/White wire on ZJ body). If voltage is more than 10 volts, replace ignition coil. If voltage is less than 10 volts, go to next step.
  8. Turn ignition off. Disconnect PCM 60-pin connector and ensure connector is clean and not damaged. Using scan tool in ohmmeter mode, check resistance in ignition coil driver circuit at PCM 60-pin connector terminal No. 19 (Black/Gray wire on XJ body, Gray wire on YJ body, or Gray/White wire on ZJ body). If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in ignition coil driver circuit.
  9. Using an external ohmmeter, check resistance in ignition coil driver circuit between ignition coil connector terminal No. 2 (Black/Gray wire on XJ body, Gray wire on YJ body, or Gray/White wire on ZJ body) and PCM connector terminal No. 19. If resistance is more than 5 ohms, repair open in ignition coil driver circuit between ignition coil connector and PCM 60-pin connector. If resistance is less than 5 ohms, replace PCM.
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