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Test G: Speedometer Inaccurate Or Speedometer & Odometer Inoperative

WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford F450 Super Duty, 2002 Ford Econoline, 2002 Ford E450 Super Duty, and 2002 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using New Generation Star (NGS), drive vehicle at a steady speed until NGS displays PCM VSS PID 30 MPH (48 KM/H). If speedometer reads 28-35 MPH (45-57 KM/H), go to next step. If speedometer does not read 28-35 MPH (45-57 KM/H), diagnose VSS circuit problem. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  2. Drive vehicle at a steady speed until NGS displays VSS PID 60 MPH (97 KM/H). If speedometer reads 58-62 MPH (94-100 KM/H), on diesel models, go to next step. On non-diesel models, go to step  4. If speedometer does not read 58-62 MPH (94-100 KM/H), diagnose VSS circuit problem. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Turn ignition switch to LOCK position. Disconnect instrument cluster White 16-pin harness connector C220a and VSS Black 2-pin harness connector C1088. VSS is located on left side of transmission. Measure resistance of Gray/Black wire between VSS harness Black 2-pin harness connector terminal No. 2 and instrument cluster White 16-pin harness connector terminal No. 7. See Figure. Resistance should be less than 5 ohms. Measure resistance between ground and instrument cluster White 16-pin harness connector terminal No. 7 (Gray/Black wire). Resistance should be more than 10 k/ohms. If resistances are as specified, go to step  5. If resistances are not as specified, repair open or short to ground in Gray/Black wire. See WIRING DIAGRAMS . Retest system operation.
  4. Turn ignition switch to LOCK position. Disconnect instrument cluster White 16-pin harness connector C220a. Disconnect PCM Gray 104-pin harness connector C175. PCM is located in left rear of engine compartment, near brake master cylinder. Measure resistance of Gray/Black wire between instrument cluster White 16-pin harness connector terminal No. 7 and PCM Gray 104-pin harness connector C175 terminal No. 68. See Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Black wire. See WIRING DIAGRAMS . Retest system operation.
  5. Measure voltage between ground and instrument cluster White 16-pin harness connector C220a terminal No. 3 (Red/White wire). If voltage is more than 10 volts, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system operation. If voltage is 10 volts or less, repair Red/White wire as necessary. See WIRING DIAGRAMS . Retest system operation.
Fig 1: Identifying PCM Gray 104-Pin Harness Connector C175 Terminals
G96F31315Courtesy of FORD MOTOR CO.
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