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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-17A - Testing Idle Speed Control Actuator

Test Dr-17A - Testing Idle Speed Control Actuator

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. Using DRB, read timing advance. While monitoring DRB display, set engine speed to 2000 RPM. If timing advance does not increase, replace Electronic Control Unit (ECU). Perform TEST VER-2 .
  2. If timing advance increases, allow engine to idle. Disconnect Idle Speed Control (ISC) actuator. While observing engine RPM, actuate injector No. 1. If engine RPM does not drop, go to step 18). If engine RPM drops, actuate fuel injector No. 2. If engine RPM does not drop, go to step 18). If engine RPM drops, go to next step.
  3. Actuate injector No. 3. If engine RPM does not drop, go to step 18). If engine RPM drops, actuate injector No. 4. If engine RPM does not drop, go to step 18). If engine speed drops, stop actuation test. Reconnect ISC actuator connector.
    NOTE: Engine should still be running for following step.
  4. Read Automatic Idle Speed (AIS) value. While monitoring DRB display, disconnect injector No. 1. If AIS value changes, reconnect injector No. 1, and perform TEST DR-18A. If AIS value does not change, reconnect injector No. 1. Disconnect ISC connector. Measure voltage at ISC connector terminal No. 5 (Red wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit to splice on Red wire. Perform TEST VER-2.
  5. Measure voltage at ISC connector terminal No. 2 (Red wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit to splice on Red wire. Perform TEST VER-2.
  6. Turn ignition off. Measure resistance between ISC actuator terminals No. 1 (Blue wire) and No. 3 (Yellow wire). If resistance is 28-100 ohms, go to next step. If resistance is not 28-100 ohms, replace ISC actuator. Perform TEST VER-2.
  7. Measure resistance between ISC actuator terminals No. 4 (Black wire) and No. 6 (White wire). If resistance is 28-100 ohms, go to next step. If resistance is not 28-100 ohms, replace ISC actuator. Perform TEST VER-2.
  8. Measure resistance between ISC actuator terminals No. 1 (Blue wire) and No. 2 (Red wire). If resistance is 14-50 ohms, go to next step. If resistance is not 14-50 ohms, replace ISC actuator. Perform TEST VER-2 .
  9. Measure resistance between ISC connector terminals No. 4 (Black wire) and No. 5 (Red wire). If resistance is 14-50 ohms, go to next step. If resistance is not 14-50 ohms, replace ISC actuator. Perform TEST VER-2.
  10. Ensure ignition is off. Disconnect Electronic Control Unit (ECU) 18-pin connector. Measure resistance between ECU 18-pin connector terminal No. 67 (White 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 White wire. Perform TEST VER-2.
  11. Measure resistance between ECU 18-pin connector terminal No. 68 (Black 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 Black wire. Perform TEST VER-2.
  12. Measure resistance between ECU 18-pin connector terminal No. 58 (Blue 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 Blue wire. Perform TEST VER-2.
  13. Measure resistance between ECU 18-pin connector terminal No. 59 (Yellow 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 Yellow wire. Perform TEST VER-2.
  14. Measure resistance of White wire between ECU 18-pin connector terminal No. 67 and ISC connector terminal No. 6. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in White wire. Perform TEST VER-2.
  15. Measure resistance of Black wire between ECU 18-pin connector terminal No. 68 and ISC connector terminal No. 4. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Black wire. Perform TEST VER-2.
  16. Measure resistance of Blue wire between ECU 18-pin connector terminal No. 58 and ISC connector terminal No. 1. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Blue wire. Perform TEST VER-2.
  17. Measure resistance of Yellow wire between ECU 18-pin connector terminal No. 59 and ISC connector terminal No. 3. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2. If resistance is more than 10 ohms, repair open circuit in Yellow wire. Perform TEST VER-2 .
  18. Stop actuation test. Connect a scope to secondary ignition. Check secondary ignition. If secondary ignition system is not okay, repair as required. Perform TEST VER-2. If secondary ignition system is okay, check for engine mechanical defects. If mechanical defects are found, repair as required. Perform TEST VER-2. If no mechanical defects are found, replace injector for affected cylinder. Perform TEST VER-2.
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