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Home >> Lincoln >> 1990 >> Mark VII LSC >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Electronic >> Testing >> Instrument Cluster >> Display Erratic

Display Erratic

  1. If display blinks on and off, go to next step. If CO or CS is displayed intermittently, go to step 5). If fuel display varies more than 2 gallons, go to step 10).
  2. Place ignition switch in ACC position. Check operation of other EIM displays while display repeats condition. If other displays are normal, replace EIM. If other displays are erratic or blink, go to next step.
  3. Check tripminder display for proper operation. If okay, go to next step. If not, check for intermittent opens in Red, Dark Green/White and Purple/Light Blue wires between EIM and tripminder. Repair as necessary.
  4. Check EIM Red, Dark Green/White and Purple/Light Blue wires for intermittent opens, loose connections or damaged wiring. If circuits are okay, replace EIM. If not, repair circuits as required.
  5. Place ignition switch in ACC position. Locate 2-wire display test connector. Connector is attached to fuse block. Install jumper wire between test terminals. Check fuel gauge display.
  6. If display is unchanged, jumper wire is not making connection. Reposition jumper wire and re-test. If display reads 01 F7, F8 000118 or 000116, go to next step. If display reads anything else, replace EIM.
  7. Depress MILES km switch on tripminder only once. Display should read 02 000000 (02 equals test number and 0s are the equal number of fuel system intermittent opens/shorts). If reading is correct, erratic condition occurred only once. No problem was found. If reading is incorrect, turn off ignition and remove jumper. Turn ignition off and go to next step.
    NOTE: In step 7), if vehicle has no mileage on odometer, a number may be displayed in place of "0". If this is the case, go to step 9).
  8. Check instrument panel harness (14401) connector, rear lights harness (14405) connector and fuel gauge sending unit connector for dirt, looseness or damage. If okay, go to next step. If not, clean or repair connectors and wiring as necessary. After service, go to next step.
  9. Clear EIM self-test. Place ignition switch in ACC position. Connect jumper wire to display test connector. Turn ignition off, wait 30 seconds and return switch to ACC position. Message 01 FX 000118 should be displayed. Depress tripminder MILES km switch only once. If 02 000000 is displayed, remove jumper and go to next step. If display reads anything else, repeat this step until 02 000000 is displayed. This step clears self-test of intermittent counts. Remove jumper and go to next step.
  10. Test drive vehicle over rough road. Repeat steps 5), 6) and 7). Verify display at end of step 7). If 02 000000 is displayed, display is okay. Remove jumper wire. If display reads anything else, repeat step 8). If test fails again, replace EIM.
  11. Test drive vehicle and check speedometer operation. If speedometer is okay, lower fuel tank. Check fuel gauge sending unit for proper operation. Replace if necessary. If speedometer is not okay, perform SPEEDOMETER READS 0 AT ALL TIMES test.
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