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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Tests W/Codes - 2.0L/2.0L Turbo) >> Diagnostic Charts >> Test Dr-15A - Testing Switches

Test Dr-15A - 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. Ensure DRB and adapter are connected 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 ignition on. 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 on. Disconnect idle switch 1-pin connector. Measure voltage between idle switch connector Green wire and ground. If voltage is less than 10 volts, go to next step. If voltage is more than 10 volts, replace idle switch. Perform TEST VER-2 .
  3. Turn ignition off. Disconnect ECU 24-pin connector. Measure resistance between idle switch connector Green wire and ground. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, repair short to ground in Green wire. Perform TEST VER-2.
  4. Measure resistance of Green wire between idle switch connector and ECU 24-pin connector terminal No. 14. If resistance is more than 10 ohms, repair open circuit in Green wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
  5. Turn engine off. Using voltmeter, backprobe ECU 10-pin connector terminal No. 108 (Black/Yellow wire). While watching voltmeter, start engine. If voltage is present when cranking engine, replace ECU. Perform TEST VER-2. If voltage is not present when cranking engine, repair open circuit in Black/Yellow wire. Perform TEST VER-2.
  6. Ensure engine is running. Read Power Steering (P/S) switch status. If DRB indicates P/S is open, go to step 8). If DRB does not indicate P/S is open, disconnect P/S pump connector. If display does not show P/S is open, go to next step. If display shows P/S is open, ensure power steering pump is operational. Replace P/S switch, and perform TEST VER-2.
  7. Turn ignition off. 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 short to ground in Yellow/Black wire. Perform TEST VER-2.
  8. Turn steering wheel left and right while monitoring display. If DRB shows P/S is closed while turning steering wheel, go to step 11). If DRB does not show P/S is closed while turning steering wheel, turn ignition off. Disconnect P/S connector. Turn ignition on.
  9. Connect jumper wire between power steering connector Yellow/Black wire and ground. If DRB shows P/S is closed, ensure power steering pump is operational. Replace P/S switch, and perform TEST VER-2. If DRB does not show P/S is closed, turn ignition off. 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 circuit in Yellow/Black wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
  11. If vehicle is not equipped with A/C, go to next step. If vehicle is equipped with A/C, 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 does show a change in A/C status, go to next step.
  12. On M/T vehicles, perform TEST DR-16A. On A/T vehicles, turn engine off. Turn ignition on. Read Park/Neutral (P/N) switch status. Move gear selector through all gear positions. If DRB display corresponds with gear position, perform TEST DR-16A. If DRB display does not correspond with gear position, disconnect ECU 10-pin connector.
  13. 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, and perform TEST VER-2. If voltage is less than 10 volts in Drive, replace ECU. Perform TEST VER-2.
  14. Disconnect Multi-Point Injection (MPI) control relay. Disconnect inhibitor switch connector. Measure resistance between MPI control relay connector terminal No. 9 (Black/Yellow wire) and ground. If resistance is less than 10 ohms, repair short to ground in Black/Yellow wire. Perform TEST VER-2 .
  15. 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 circuit in 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.
  16. If voltage is less than 10 volts, repair open circuit in 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. Adjust if necessary. If inhibitor switch is correctly adjusted, replace inhibitor switch. Perform TEST VER-2.
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