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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Tests W/Codes - 1.8L) >> Diagnostic Charts >> Test Dr-14A - Testing Switches

Test Dr-14A - Testing Switches

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 .
  1. Connect DRB and adapter to diagnostic connector. Read crank signal value. While watching DRB display, start engine. If crank signal does not change, go to step 5). If crank signal changes, turn engine off. Turn ignition switch to ON position. Read idle switch value. Ensure throttle cable is properly adjusted before proceeding.
  2. While monitoring display, open and close throttle. If DRB display changes, go to step 6). If DRB display does not change, turn engine off. Turn ignition switch to ON position. Disconnect idle switch 6-pin connector. Measure voltage between idle speed control 6-pin connector terminal No. 4 (Dark Green wire) and ground. If voltage is more than 4 volts, replace idle switch. Perform TEST VER-2 .
  3. If voltage is less than 4 volts, turn ignition switch to OFF position. Disconnect ECU 24-pin connector. Measure resistance between idle speed control 6-pin connector terminal No. 4 (Dark Green wire) and ground. If resistance is less than 10 ohms, repair Dark Green wire for a short to ground. Perform TEST VER-2.
  4. If resistance is more than 10 ohms, measure resistance of Dark Green wire between idle speed control 6-pin connector terminal No. 4 and ECU 24-pin connector terminal No. 6. If resistance is more than 10 ohms, repair open Dark Green wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
  5. Turn engine off. Backprobe ECU 10-pin connector between terminal No. 108 (Black/Yellow wire) and ground. While watching voltmeter, start engine. If voltage exists when engine is cranked, replace ECU. Perform TEST VER-2. If voltage does not exist when engine is cranked, repair open Black/Yellow wire. Perform TEST VER-2.
  6. Start engine. Read Power Steering (P/S) switch status. If DRB indicates P/S is open, go to step 8). If it does not indicate P/S is open, disconnect P/S pump connector. If display shows P/S is off, ensure power steering pump is operational. Replace P/S switch. Perform TEST VER-2.
  7. If display does not show P/S is off, turn ignition switch to OFF position. Disconnect ECU 24-pin connector. Measure resistance between ECU 24-pin connector terminal No. 5 (Yellow/Black wire) and ground. If resistance is more than 10 ohms, replace ECU. Perform TEST VER-2. If resistance is less than 10 ohms, repair Yellow/Black wire for a short to ground. Perform TEST VER-2 .
  8. Turn steering wheel left and right while monitoring display. If DRB indicates P/S is closed while turning wheel, go to step 11). If DRB does not indicate P/S is closed while turning wheel, turn engine off. Disconnect/S connector. Turn ignition switch to ON position.
  9. Connect jumper wire between power steering connector Yellow/Black wire and ground. If DRB indicates P/S is on, ensure power steering pump is operational. Replace P/S switch. Perform TEST VER-2. If DRB does not indicate P/S is on, turn ignition switch to OFF position. Disconnect ECU 24-pin connector.
  10. Measure resistance of Yellow/Black wire between ECU 24-pin connector terminal No. 5 and power steering connector. If resistance is more than 10 ohms, repair open Yellow/Black wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
  11. If vehicle is equipped with A/C, go to next step. If vehicle is not equipped with A/C, go to step 13).
  12. Read A/C switch status. While monitoring DRB display, turn A/C switch on, and cycle blower switch. If DRB display does not show a change in A/C status, repair open circuit between A/C switch and ECU. Perform TEST VER-2. If DRB display shows a change in A/C status, go to next step.
  13. On M/T models, perform TEST DR-15A. On A/T models, turn engine off. Turn ignition switch to ON position. Read Park/Neutral (P/N) switch status. Move gear selector through all gear positions. If DRB display corresponds with gear position, perform TEST DR-15A. If DRB display does not correspond with gear position, disconnect ECU 10-pin connector.
  14. Place gear selector in Park. Measure voltage between ECU 10-pin connector terminal No. 108 (Black/Yellow wire) and ground. If voltage is less than 10 volts, go to next step. If voltage is more than 10 volts, place gear selector in Drive. If voltage is more than 10 volts in Drive, ensure inhibitor switch is correctly adjusted. Replace inhibitor switch as required. Perform TEST VER-2. If voltage is less than 10 volts in Drive, replace ECU. Perform TEST VER-2.
  15. Disconnect fuel injection control relay. Disconnect inhibitor switch. Measure resistance between fuel injection control relay connector terminal No. 7 (Black/Yellow wire) and ground. If resistance is less than 10 ohms, repair Black/Yellow wire for a short to ground. Perform TEST VER-2.
  16. If resistance is more than 10 ohms, measure resistance of Black/Yellow wire between inhibitor switch connector terminal No. 9 and ECU 10-pin connector terminal No. 108. If resistance is more than 10 ohms, repair open Black/Yellow wire. Perform TEST VER-2. If resistance is less than 10 ohms, measure voltage between inhibitor switch connector terminal No. 9 (Black/Yellow wire) and ground.
  17. If voltage is less than 10 volts, repair open Black/Yellow wire between inhibitor switch and ignition switch. Perform TEST VER-2 . If voltage is more than 10 volts, ensure inhibitor switch is correctly adjusted. Replace inhibitor switch if necessary. Perform TEST VER-2.
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