Entering Self-Diagnostics
WARNING: This page is about a different car, the 1999 Lincoln Navigator and 1999 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure coolant temperature is at least 120°F (49°C) before entering self-diagnostics. Ensure in-car temperature is between 40-90°F (4-32°C). Simultaneously depress OFF and FLOOR buttons, then press AUTOMATIC button within 2 seconds. Display will show a dashed line in the center of the display window for up to 30 seconds while test is running. Record all DTCs as displayed.
- If DTCs are displayed, perform test indicated. See SELF-DIAGNOSTIC TEST CODE DIRECTORY table. If a condition exists but no DTCs are displayed, go to SYMPTOM DIAGNOSIS .
- Self-diagnostics can be initiated at any time with the resulting DTCs being displayed. Normal system operation is stopped when system is in self-diagnostic mode.
SELF-DIAGNOSTIC TEST CODE DIRECTORY
| Self-Test & (Intermittent) Fault (Run Time Code) |
NGS Tester (DTC) Code |
Problem/Description |
Test No. |
| 024 (022) |
B1249 |
Blend Door Actuator Short |
B1249 |
| 024 (025) |
B1249 |
Blend Door Actuator Failure |
B1249 |
| 031 (N/A) |
B1251 |
In-Car Temp. Sensor Open |
B1251/B1253 |
| 030 (N/A) |
B1253 |
In-Car Temp. Sensor Short |
B1251/B1253 |
| 041 (043) |
B1255 |
Ambient Air Temp. Sensor Open |
B1255/B1257 |
| 040 (042) |
B1257 |
Ambient Air Temp. Sensor Short |
B1255/B1257 |
| 050 (052) |
B1261 |
Sunload Temp. Sensor Short |
B1261 |
| N/A (N/A) |
U1073 |
Engine Coolant Temp. Signal |
|
| N/A (N/A) |
U1341 |
Vehicle Speed Sensor |
|