1999 Ford Escort Speedometer working intermittently

Tiny
GOT2RAMBLE
  • MEMBER
  • 1999 FORD ESCORT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 11,500 MILES
Sometimes when I am at highway speed (65 mph ) the speedometer will stop working only to come back to life while driving in town at 25 mph. This has occurred several times and the last time the check engine light came on at the same time that the speedometer quit working. The car does have an after market cruise control that was installed by the dealer several years ago.
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Monday, February 2nd, 2009 AT 9:02 PM

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Tiny
DAVE H
  • EXPERT
Hello. Thanks for the donation. Much appreciated

Check the wiring and check/clean or repalce the VSS (vehicle speed sensor). Hope this helps. Let me know !

Sedan & Wagon
Turn ignition off. Connect scan tool and retrieve Diagnostic Trouble Codes (DTC) following manufacturer's instructions. If no DTCs are present, go to next step. If DTCs are present, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Repair DTCs as necessary, then retest system.
Using scan tool, observe Vehicle Speed Sensor (VSS) output Parameter Identification (PID) while assistant drives vehicle over range of speeds on various road surfaces. If VSS PID varies smoothly with vehicle speed, go to next step. If VSS PID does not vary or is erratic, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE to diagnose VSS.
Remove and check OBDII 10-amp fuse in engine compartment fuse box. If fuse is okay, reinstall fuse and go to step 5. If fuse is blown, go to next step.
Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect all instrument cluster electrical connectors. Measure resistance between ground and instrument cluster harness connector C252 terminal No. 12 (Green wire). See Fig. 6. Measured resistance should be more than 10 k/ohms. If resistance is more than 10 k/ohms, replace OBDII 10-amp fuse and go to next step. If resistance is less than 10 k/ohms, repair short to ground in Green wire between instrument cluster harness connector and fuse. See WIRING DIAGRAMS.
Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect instrument cluster electrical connectors. Measure voltage between ground and instrument cluster harness connector C252 terminal No. 12 (Green wire). See Fig. 6. Voltage should be more than 10 volts. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair short to voltage in Green wire between instrument cluster harness connector and fuse. See WIRING DIAGRAMS.
Turn ignition off. Disconnect Vehicle Speed Sensor (VSS) harness connector C132. Measure resistance of Blue wire between VSS harness connector and instrument cluster harness connector C252 terminal No. 7. See Fig. 6. Measure resistance of White/Black wire between VSS harness connector C132 and instrument cluster harness connector C253 terminal No. 9. Resistance in both tests should be less than 5 ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open in White/Black or Blue wire. See WIRING DIAGRAMS.
Measure resistance between ground and instrument cluster harness connector C253 terminal No. 9 (White/Black wire). Resistance should be more than 10 k/ohms. If measured resistance is more than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in White/Black wire.
Turn ignition on. Measure voltage between ground and instrument cluster harness connector C252 terminals No. 8 and 4 (Black/Yellow wire). See Fig. 6. Voltage should be more than 10 volts. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair short to voltage in Black/Yellow wire between instrument cluster connector and fuse. See WIRING DIAGRAMS.
Turn ignition off. Visually inspect instrument cluster printed circuit for damage, cracks or hot spots. If instrument cluster printed circuit is okay, replace speedometer. If instrument cluster printed circuit is damaged, replace printed circuit and gauge contact clips. See PRINTED CIRCUIT under REMOVAL & INSTALLATION.
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Tuesday, February 3rd, 2009 AT 6:12 AM

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