NO-START TEST NOTE: Perform TESTING SPARK AT COIL before proceeding with NO-START TEST. Unplug coil connector and coil. Connect a pair of jumper wires between coil and coil connector. Ensure sufficient battery voltage (12.4 volts) is available to crank engine and operate ignition systems. Crank engine for 5 seconds while measuring voltage at coil positive terminal. 1. If voltage remains near zero during entire period of cranking, see TESTS W/CODES - 5.2L GASOLINE article in the ENGINE PERFORMANCE section to check PCM and ASD relay. If voltage is near battery voltage and drops to zero after 1-2 seconds of cranking, see TESTS W/CODES - 5.2L GASOLINE article in the ENGINE PERFORMANCE section to check PCM circuit. 2. If voltage remains near battery voltage during entire 5 seconds, turn ignition switch to OFF position. Disconnect PCM 60-pin connector. Check 60-pin connector for loose terminals (push- outs). If connector is okay, go to next step. 3. Remove positive lead from coil. Connect a jumper wire between positive battery terminal and coil positive terminal. Using a specially constructed jumper wire, momentarily ground PCM harness connector terminal No. 19. See Fig. 1 and Fig. 2 . Spark should be generated when ground connection is removed. 4. If spark is generated, replace PCM. If no spark is generated, use special jumper wire directly on coil negative terminal. If spark is produced, repair wiring harness for an open circuit. If no spark is produced, replace ignition coil. 5.
Saturday, May 23rd, 2009 AT 7:06 AM