1997 Ford Explorer Instrument Cluster

Tiny
DAVID ROADS
  • MEMBER
  • 1997 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 148,000 MILES
I removed the instrument cluster to change out several bulbs, however none of the gauges work after I re-installed it. I verified all three wiring harnesses are locked in and checked fuses.
I have dash lights and it appears the warning light come on when starting the engine.
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Tuesday, November 30th, 2010 AT 7:10 PM

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Tiny
KHLOW2008
  • EXPERT
Perform the following test and see if you can come up with anything. Only perform those that are applicable.

SPEEDOMETER/ODOMETER INOPERATIVE

1. Turn ignition switch off. Remove instrument cluster. Measure voltage between ground and instrument cluster connector C288, terminal No. 7 (White/Yellow wire). See Fig. 3. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in White/Yellow wire between instrument cluster connector and fuse No. 25 located in interior fuse panel and retest system.

2. Disconnect Vehicle Speed Sensor (VSS) harness connector. Measure resistance of Gray/Black wire between instrument cluster connector C287, terminal No. 1 and VSS harness connector. See Fig. 1. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Gray/Black wire between instrument cluster connector and VSS harness connector and retest system.

NOTE:
Measurements must be made at speedometer gauge pins inside instrument cluster printed circuit clips.

3. Measure resistance of printed circuit between speedometer pins (in center of clips) and corresponding instrument cluster connector terminal. See SPEEDOMETER PRINTED CIRCUIT CHECK table. If all resistances are less than one ohm, go to next step. If any resistance is more than one ohm, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT under REMOVAL & INSTALLATION.

4. Remove VSS from transmission. Measure resistance between VSS terminals. If resistance is 200-300 ohms, go to next step. If resistance is not 200-300 ohms, replace VSS and retest system.

5. Measure AC voltage between VSS terminals while spinning VSS shaft. If voltage changes, go to next step. If voltage does not change, replace VSS and retest system.

6. Inspect VSS driven gear for damage or wear. If driven gear is damaged or worn, replace driven gear and retest system. If driven gear is not damaged or worn, replace speedometer and retest system.

TACHOMETER INOPERATIVE

1. Turn ignition switch off. Remove instrument cluster. Measure resistance between ground and instrument cluster connector C286, terminal No. 16 (Black/White wire). See Fig. 4. If resistance is less
than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/White wire between instrument cluster connector and ground and retest system.

2. Disconnect negative battery cable and Powertrain Control Module (PCM). Install EEC-V 104-Pin Breakout Box (014-00950) following manufacturer's instructions. Measure resistance between instrument cluster connector C286, terminal No. 11 (Tan/Yellow wire) and breakout box test pin No. 48. If resistance is less than 5 ohms, remove breakout box. Reconnect PCM and negative battery cable and go to next step. If resistance is more than 5 ohms, repair open in Tan/Yellow wire between instrument cluster connector and PCM and retest system.

3. Start engine and allow to idle. Measure voltage between ground and instrument cluster connector C286, terminal No. 11 (Tan/Yellow wire). If voltage is 5-8 volts, go to next step. If voltage is not 5-8 volts, temporally substitute a known good PCM and retest system.

4. Measure resistance of printed circuit between tachometer pins (in center of clips) and corresponding instrument cluster connector C286, terminals No. 13, 15 and 16 and connector C287, terminal No. 2. If all resistances are less than 5 ohms, replace tachometer and retest system. If any resistance is more than 5 ohms, replace instrument cluster printed circuit. See PRINTED CIRCUIT under REMOVAL & INSTALLATION.

PRINTED CIRCUIT
Removal & Installation
Remove instrument cluster. Remove instrument cluster gauge amplifier. See INSTRUMENT CLUSTER GAUGE AMPLIFIER.

2. Remove all instrument panel illumination and indicator bulbs by turning counterclockwise. Remove gauges.

3. Remove 19 instrument gauge connector clips using long-nose pliers. Squeeze both sides of clip equally so locking ears pass through opening in instrument cluster case. Be careful not to overbend or distort clips. DO NOT reuse instrument gauge clips.

4. Ease instrument cluster printed circuit up and off locating pins and remove from case. To install, reverse removal procedure. Use NEW instrument gauge clips.

INSTRUMENT CLUSTER GAUGE AMPLIFIER
NOTE:
Instrument cluster gauge amplifier is a printed circuit board assembly located in a pocket on back of instrument cluster. There are no provisions for calibration or adjustment. Amplifier and fuel gauge must be replaced as an assembly.

Removal & Installation

1. Remove instrument cluster. Carefully depress retaining clip on component side of board and pull board assembly out of instrument cluster pocket.

2. To install instrument cluster gauge amplifier, insert into slots in instrument cluster and press home firmly with thumb on edge of board. An audible click will be heard as retaining clip engages. To complete installation, reverse removal procedure.
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Sunday, December 5th, 2010 AT 5:30 AM

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