System Tests: Notes
WARNING:
Deactivate air bag system before performing any service operation involving instrument panel or steering column components. See AIR BAG RESTRAINT SYSTEMS - EXCURSION & F250-F550 SUPER DUTY PICKUPS
article in RESTRAINTS. Do not apply electrical power to any component on instrument panel or steering column without first deactivating air bag system. Air bag may deploy.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES
article in GENERAL INFORMATION before disconnecting battery.
CAUTION:
Use correct probe adapter when taking measurements. Failure to use proper adapter may cause damage to harness connector.
NOTE:
Before beginning system tests, perform PRELIMINARY INSPECTION under TROUBLE SHOOTING. A Digital Volt-Ohmmeter (DVOM) is required to test the analog instrument panel system. After repairs are complete, ensure all components are correctly installed and all harness connectors are connected correctly.
NOTE:
This testing does not cover Motorhomes. After making any repair, clear codes and perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - EXCURSION & F250-F550 SUPER DUTY PICKUPS
article.
SYMPTOM INDEX
| Symptom | Perform System Test | ||||||
|---|---|---|---|---|---|---|---|
| No Scan Tool Communication With Instrument Cluster (HEC) | A | ||||||
| Fuel Gauge Reads Incorrectly | B | ||||||
| Low Fuel Warning Indicator Always/Never On | C | ||||||
| Voltage Gauge Reads Incorrectly (M/T Only) | D | ||||||
| Oil Pressure Gauge Reads Incorrectly | E | ||||||
| Engine Temperature Gauge Reads Incorrectly | F | ||||||
| Transmission Temperature Gauge Reads Incorrectly (A/T Only) | G | ||||||
| Speedometer Inoperative Or Inaccurate | H | ||||||
| Tachometer Reads Incorrectly | I | ||||||
| Trip Odometer Inoperative, Speedometer Operates Correctly | (1) | ||||||
| Yellow Brake (ABS) Warning Indicator Always/Never On | J | ||||||
| Red Brake Warning Indicator Always/Never On | K | ||||||
| SERVICE ENGINE SOON Warning Indicator Inoperative | L | ||||||
| SERVICE ENGINE SOON Warning Indicator Is Always On | (2) | ||||||
| Charge System Warning Indicator Inoperative | M | ||||||
| Charge System Warning Indicator Is Always On | (3) | ||||||
| Air Bag Warning Indicator Always/Never On | N | ||||||
| High Beam Indicator Inoperative | O | ||||||
| Left Turn Signal Indicator Inoperative | P | ||||||
| Right Turn Signal Indicator Inoperative | Q | ||||||
| DOOR AJAR Warning Indicator Inoperative, Chime Operative | R | ||||||
| Safety Belt Warning Indicator Inoperative Or Does Not Operate Correctly, Chime Operative Or Does Not Operate Correctly | S | ||||||
| 4X4/4X4 LOW RANGE Indicator Inoperative (Manual Shift) | T | ||||||
| 4X4/4X4 LOW RANGE Indicator Always On (Manual Shift) | U | ||||||
| WAIT TO START Warning Indicator Inoperative (Diesel) | V | ||||||
| WATER IN FUEL Warning Indicator Inoperative (Diesel) | W | ||||||
| Speed Control Indicator Is Always/Never On | X | ||||||
| Theft Indicator Is Always/Never On (Excursion Only) | Y | ||||||
| Check Fuel Cap Indicator Is Inoperative/Always On | Z | ||||||
| CHECK GAGE Indicator Is Inoperative/Always On | AA | ||||||
| Check Air Filter Indicator Is Always/Never On (Diesel) | AB | ||||||
| Instrument Cluster Is Inoperative | AC | ||||||
|
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