Chapter 14 Troubleshooting Electronic Control System Problems 359 Copyright by Goodheart-Willcox Co., Inc. Figure 14-29. This diagnostic chart is used when checking a wiring harness on a common automatic transaxle. Note that, even though the second procedure (C9) is a check for continuity (a complete circuit), an ohmmeter must be used. Using an ohmmeter instead of a test light ensures that the internal transaxle parts will not be damaged. (Ford) C8 Check internal axode harness (continuity) • Disconnect the internal harness from the solenoid (MCCC/CCC wire connector) NOTE: Do not probe into connector terminals. • Connect the positive lead from an ohmmeter to the tester MCCC/CCC jack and negative lead at the Black (91/92 MY) or Brown (93 MY) wire at the MCCC/CCC connector. • Record resistance. Should be less than .5 ohms. • Next, connect the positive lead from an ohmmeter to the tester VPWR jack and the negative lead at the Red (91/92 MY) or Green (93 MY) wire of the MCCC/CCC connector. • Record resistance. Is the resistance less than .5 ohms? Results Yes No Action to take Go to C9. Replace internal harness. Go to C10. C9 Check internal axode harness • Check for continuity between BAT – (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps). Solenoid Wire color 91/92 93 MCCC/CCC Black Brown VPWR Red Green • Connection should not show continuity (infinite). • Is there continuity? Yes No Replace internal harness. Go to C10. Go to C10. Figure 14-30. Splices are a common source of problems. Carefully inspect the splice for looseness or signs of overheat- ing. (General Motors) Inspect splice Figure 14-31. A close-fitting wiring harness is subject to dam- age. Wiring harnesses should be inspected in areas where they pass through tight spots and near engine and exhaust system parts. (General Motors)