Troubleshooting Hints - All Displays Except Compass and Ambient Temp Display

1. CHECK condition of, TRANS, GAUGES. and ILLUM FUSE(S). If Fuse(s) are open, LOCATE and REPAIR cause of overload and REPLACE Fuse(s).
2. CHECK that Grounds G105, G107, and G110 are clean and tight.
3. If two or more Instrument Cluster Gauge/Indications are not operating, CHECK power and grounding Circuits which are common to the Gauges/Indicators.
4. The CHECK GAUGES indication is illuminated when the ignition Switch is placed in the RUN position, it remains illuminated until the Engine Oil Pressure increases to normal operating pressure and the indication extinguishes. If the indicator does not illuminate with the Ignition Switch in the RUN position, and the bulb does not have an open filament, then perform the Oil Pressure Gauge indicates high pressure at all times diagnosis.
5. CHECK for open filaments in inoperative lamps.
6. Instrument Cluster Gauges are sufficiently accurate to provide reasonable indications for vehicle operation. Maintenance measurements are made with test Gauges of greater accuracy. A static error in indication for an Instrument Cluster Gauge of 10% of visible scale is normally acceptable dynamic error, as introduced by sloshing of fuel in the Fuel Tank during acceleration or breaking is also acceptable as long as the Gauge indicates reasonable, During steady state conditions. Errors due to non-linearity as in temperature senders or in Fuel Tank construction are also acceptable. Gauge accuracy should be sufficient to avoid false or misleading indications. If the indication is false or misleading, then corrective action is required.
7. If the odometer functions but the speedometer does not function, then REPLACE the Instrument Cluster. If the speedometer is inaccurate in road test but the odometer is accurate, then REPLACE the Instrument Cluster.
^ CHECK for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove GOOD in a Continuity/Voltage check with a system disconnected. These Circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a Voltage drop with the system operational (under load).
^ CHECK for proper installation of aftermarket electronic equipment which may effect the integrity of other system (Refer to Troubleshooting Procedures). Diagnostic Aids