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Test FC-30A - Auto Shutdown Relay Control Circuit (DTC 42)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase fault messages. Using DRB-II, actuate Auto Shutdown (ASD) relay. If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step 6).
  2. If vehicle will not start and run, go to TEST FC-30B. If vehicle will start and run, condition required to set fault is not present at this time. Go to next step.
  3. AUTO SHUTDOWN RELAY CONTROL CIRCUIT fault sets if Auto Shutdown (ASD) relay and fuel pump relay control circuit (Dark Blue/Yellow wire) are not in proper state when monitored by Powertrain Control Module (PCM) during cranking. Possible causes are: open or short in ASD relay and fuel pump relay control circuits (Dark Blue/Yellow wire), open or short in ASD relay ignition feed circuit (Dark Blue/White wire), or failed driver in Powertrain Control Module (PCM). Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform VERIFICATION PROCEDURE VER-2. If no problems were found with wiring and connectors, go to next step.
  5. While still actuating ASD relay, wiggle wiring harness from ASD relay to Powertrain Control Module (PCM). Stop actuation of ASD relay. Using DRB-II, read fault messages. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT fault returned, repair wiring harness as necessary. Perform VERIFICATION PROCEDURE VER-2. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT fault did not return, system is now functioning properly. Perform VERIFICATION PROCEDURE VER-2.
  6. Remove ASD relay. Install a known good ASD relay. If known good ASD relay is clicking, replace original ASD relay. Perform VERIFICATION PROCEDURE VER-2. If known good ASD relay is not clicking, remove known good ASD relay. Put DRB-II in voltmeter mode.
  7. DRB-II should still be actuating ASD relay. Using DRB-II, check voltage on ASD relay connector, ignition feed circuit (Dark Blue wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform VERIFICATION PROCEDURE VER-2. If voltage is more than 10 volts, turn ignition off.
  8. Disconnect PCM connector. Put DRB-II in ohmmeter mode. Using DRB-II, check resistance of ASD relay connector, control circuit (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire. Perform VERIFICATION PROCEDURE VER-2.
  9. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM connector terminal No. 51. If resistance is morethan 5 ohms, repair open in Dark Blue/Yellow wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is less than 5 ohms, replace PCM. Perform VERIFICATION PROCEDURE VER-2.
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