Test Dr-12A - Testing Fuel Pump Sense (Code 42)
WARNING: This page is about a different car, the 1994 Plymouth Laser and 1994 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS .
- Using DRB, erase faults. Start engine, and let it idle for more than one minute. Read faults. If Code 42 is not displayed again, go to step 3). If Code 42 is displayed again, backprobe Electronic Control Unit (ECU) 10-pin connector between terminal No. 109 (Black/White wire) and ground. If voltage is more than 10 volts, replace ECU. Perform TEST VER-2 .
- If voltage is less than 10 volts, repair open Black/White wire between ECU connector terminal No. 109 and fuel injection control relay terminal No. 1. Perform TEST VER-2.
- Wiggle wiring harness between fuel injection control relay and ECU. If Code 42 is displayed, repair wiring harness where wiggling harness caused Code 42 to set. Perform TEST VER-2. If Code 42 is not set, perform TEST DR-14A .