Cherokee 4WD L6-4.0L VIN S (1998)
Automatic Shut Down (ASD) Relay: Testing and Inspection
NOTE: To perform a complete test of this relay and its circuitry, refer to the DRB scan tool. Also refer to the Powertrain Management/Computer and
Control Systems appropriate Powertrain Diagnostics Procedures.
To test the relay itself:
1. Remove relay from connector before testing.
2. With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance should be between
75 +/- 5 ohms.
3. Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
4. Connect the ohmmeter between terminals 87 and 30. The ohmmeter should not show continuity at this time.
5. Connect one end of a jumper wire (16 gauge or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12
volt power source.
6. Connect one end of another jumper wire (16 gauge or smaller) to the power side of the 12 volt power source. Do not attach the other end of the
jumper wire to the relay at this time.
WARNING: Do not allow ohmmeter to contact terminals 85 or 86 during this test.
7. Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay
terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
8. Disconnect jumper wires.
9. Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, it operates properly. Check the remainder of the
ASD and fuel pump relay circuits.
