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System Tests: Notes

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: Disconnect battery before disconnecting Generic Electronic Module (GEM) connectors. Failure to do so will result in GEM storing erroneous codes and may also result in erratic operation of GEM after reconnecting battery.
NOTE: 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 Test
No Scan Tool Communication With GEM A 
All Gauges Inoperative B 
Fuel Gauge Reads Incorrectly C 
Low Fuel Warning Indicator Light Never On D 
Low Fuel Indicator Is Always On (1)
Voltage Gauge Reads Incorrectly E 
Oil Pressure Gauge Reads Incorrectly F 
Temperature Gauge Reads Incorrectly G 
Speedometer Inoperative H 
Trip Odometer Inoperative, Speedometer Okay (2)
Tachometer Reads Incorrectly I 
Speedometer Reads Incorrectly, Odometer Okay J 
Yellow Brake (ABS) Warning Indicator Light Never On K 
Yellow Brake (ABS) Warning Indicator Light Always On (3)
Red BRAKE Warning Indicator Light Never On L 
RED BRAKE Warning Indicator Light Always On (4)
SERVICE ENGINE SOON Warning Indicator Light Inoperative M 
SERVICE ENGINE SOON Warning Indicator Light Always On (5)
Charge System Warning Indicator Light Inoperative N 
Charge System Warning Indicator Light Always On (6)
Air Bag Warning Indicator Light Inoperative Or Always On O 
High Beam Indicator Light Inoperative P 
Left Turn Signal Indicator Light Inoperative Q 
Right Turn Signal Indicator Light Inoperative R 
DOOR AJAR Warning Indicator Light Inoperative S 
Safety Belt Warning Indicator Light Inoperative Or Does Not Operate Properly T 
4X4/4X4 LOW RANGE Indicator Light Inoperative (Manual Shift) U 
4X4/LOW RANGE Indicator Light Always On (Manual Shift) V 
WAIT TO START Warning Indicator Light Inoperative (Diesel) W 
WATER IN FUEL Warning Indicator Light Inoperative (Diesel) X 
4X4/4X4 LOW RANGE Indicator Light Inoperative (Automatic) (7)
Speed Control Indicator Is Never/Always On Y 
Theft Indicator Is Never/Always On Z 
No Communication With Compuvalve (Bi-Fuel Only) AA 
Incorrect Fuel Gauge Reading In Gasoline Mode (Bi-Fuel Only) AB 
Incorrect Fuel Gauge Indication in Alternative Fuel Mode & Gasoline Mode (Bi-Fuel Only) AC 
Instrument Cluster Is Inoperative (Bi-Fuel Only) AD 
(1) Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION in this article and retest.
(2) Verify trip odometer reset lever is not binding. If okay, repair instrument cluster.
(3) Malfunction in anti-lock brakes system. See appropriate ANTI-LOCK article in BRAKES for diagnosis.
(4) Malfunction in brake system. See appropriate article in BRAKES for diagnosis.
(5) See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(6) See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
(7) See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
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