Test V: No Code

The following may cause this symptom:

• Worn or damaged ignition switch.
• Open power circuit to ECU.
• Low battery voltage (less than 8 volts).
• Blown fuse.
• Open system ground.

1. Check Fuse
   
   Turn ignition off. Disconnect ECU connector. Connect breakout box and adapter. Locate ignition fuse No. 15 (10-amp), located in power distribution box. Using an ohmmeter, check fuse continuity. Ensure fuse terminals in power distribution box are clean and secure. If continuity exists, install fuse and go next step. If continuity does not exist, replace fuse. Clean terminals as necessary. Go to PRETEST CHECKS  .
2. Check Ground
   
   Turn ignition off. Inspect ground connection at left radiator support for excessive dirt, corrosion and looseness. Clean as necessary. Check for continuity at breakout box pin No. 1 and ground stud at left radiator support. Check for continuity between breakout box pin No. 14 and ground stud at left radiator support. If continuity exists at both pins, go to next step. If continuity does not exist at both pins, repair open circuit between ECU harness connector and ground stud. Go to PRETEST CHECKS  .
3. Check Diagnostic Wire
   
   Turn ignition off. Check continuity between data link connector White/Light Blue wire and breakout box pin No. 16. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair White/Light Blue wire. Go to PRETEST CHECKS  .
4. Check Ground
   
   Turn ignition off. Check continuity between data link connector Black wire and ground. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair Black wire.
5. Check Ignition Voltage At ECU
   
   Turn ignition on. Using voltmeter, measure voltage between breakout box pins No. 20 and 1. If voltage is at least 8 volts, replace ECU. Go to PRETEST CHECKS  . If voltage is less than 8 but more than zero volts, ECU cannot initialize due to insufficient ignition voltage. Problem is not in ABS. Repair high resistance in ignition feed circuit No. 601. See WIRING DIAGRAM  . If voltage is not present, repair open circuit in Light Blue/Pink wire between ignition and ECU harness connector. See WIRING DIAGRAM  for circuit identification. Go to PRETEST CHECKS  .