Instruments - Temp Gauge Fluctuating/Flashing MIL Light

88pontiac13

Bulletin Number: 88-8-18
Reference Number: 888305
Publish Date: 8/88
Subject: FLUCTUATING TEMPERATURE GAUGE AND FLASHING CHECK ENGINE LIGHT

Models

Affected: 1988 SUNBIRD WITH U21 OR UBO GAUGE CLUSTER WITH TRIP ODOMETER
If a condition of fluctuating temperature gauge and flashing check engine light occurs, the cause may be an incorrectly routed stepper motor harness.

FIGURE 1:

If the harness was routed through the temperature gage clip (see Figure 1), it could cause a short between harness and gage resulting in gauge fluctuation and a flashing check engine light at vehicle speed sensor pulse speed.

FIGURE 2:

To repair this condition move the harness behind the clip (see Figure 2), and install a new odometer assembly.
The part number for the odometer assembly is 25061404.

Use applicable labor operation and time.