1997 Ford Mustang, got alittle problem

LUKASBESTER

MEMBER
1997 FORD MUSTANG
6 CYL
2WD
AUTOMATIC
116,000 MILES

Hi I was hoping you could shed some light on a question I have?I left my mustang standing for bout a month when I went on holiday, I disconectet the battery termanals, so the battery would not go down. When I got back and started it up angain, I shortly after realised that my millage couter had got stuck;(. Please can can you tell me what to do to get the millage counter running again?Its already the second mustang I have owned that has the same problem, please advise.

Lukas

1 Reply

DAVE H

MECHANIC
13,383 POSTS

Let me know if you need any of the diagrams mentioned !

SPEEDOMETER/ODOMETER INACCURATE
Road test vehicle. If speedometer is operating, go to next step. If speedometer is not operating, go to step 5).
Drive vehicle over a known, measured distance. If odometer is reading accurately, go to next step. If inaccurate, go to step 4).
Drive vehicle at a steady speed over a known, measured distance and record time taken to travel that distance. If speedometer meets Speedometer Calibration Tolerance specifications, system is okay. See SPEEDOMETER CALIBRATION TOLERANCE table. If speedometer fails to meet speedometer calibration tolerance, replace speedometer assembly.
SPEEDOMETER CALIBRATION TOLERANCE (1)
Actual Speed - MPHAllowable Range - MPH
3027.8-34.7
6057.7-64.5
(1)Odometer measured over actual 10 miles: 9.6-10.3 miles.

Check for correct driven gear on Vehicle Speed Sensor (VSS). If driven or drive gear is suspect, refer to manufacturer's parts department for correct specifications in relation to final drive ratio and tire size. If parts are correct, go to next step. If parts are not correct, install correct parts and retest system. See Fig. 5.
Raise drive wheels off ground and support vehicle. Disconnect vehicle speed sensor connector. Connect and AC voltmeter between output terminals of VSS. Operate vehicle in Drive at 20-40 MPH and observe voltmeter. If voltage is 1.3-6.1 volts AC, go to step 8). If voltage is not correct, go to next step.
Disconnect VSS from automatic transmission. Verify presence of speedometer driven gear with all teeth in good condition and presence of retainer clip. If driven gear teeth are okay and clip is present, go to next step. If gear is damaged or clip missing, replace with proper speedometer gear and clip and retest system.
Verify presence of speedometer drive gear on output shaft of transmission. If drive gear is present, go to next step. If drive gear is not present, repair transmission as necessary.
Disconnect negative battery cable and remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect instrument cluster connectors C1 and C2. See Fig. 3 and Fig. 4. Reconnect negative battery cable and turn ignition switch to RUN position. Check for battery voltage at instrument cluster connector C1, terminal No. 4 (Light Green/Yellow wire). If battery voltage is present, go to step 10). If battery voltage is not present, go to next step.
Remove fuse No. 8 (10-amp). See Fig. 2. Measure resistance between ground and instrument panel connector C1, terminal No. 4 (Light Green/Yellow wire). If resistance is more than 10 k/ohms, repair open in Light Green/Yellow wire and retest system. If resistance is less than 10 k/ohms, repair short to ground in Light Green/Yellow wire.
Turn ignition off. Measure resistance between ground and instrument cluster connector C1, terminal No. 6 (Pink/Orange wire). If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair open in Pink/Orange wire and retest system.
Reconnect VSS. Using an ohmmeter, measure resistance between ground and instrument cluster connector C1, terminal No. 5 (Gray/Black wire). If resistance is less than 10 k/ohms, repair short to ground in Gray/Black wire and retest system. If resistance is more than 10 k/ohms, go to next step.
Using an ohmmeter, check resistance between cluster connector C1, terminal No. 5 (Gray/Black wire) and circuit No. 679 (Gray/Black wire) at VSS connector. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair circuit No. 679 (Gray/Black wire) for open and retest system.
Check resistance between ground and circuit No. 676 (Pink/Orange wire) at VSS connector. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair circuit No. 676 (Pink/Orange wire) for open and retest system.
Turn ignition off. Check for continuity between cluster connector printed circuit connections and gauge. If there is continuity through instrument cluster printed circuit, replace speedometer assembly and retest system. See SPEEDOMETER/TACHOMETER under REMOVAL & INSTALLATION. If continuity is not present, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT under REMOVAL & INSTALLATION.