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System Tests: Notes

WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Disconnect negative battery cable before disconnecting GEM or CTM connectors, failure to do so can result in GEM/CTM storing erroneous codes and may also result in erratic operation of GEM/CTM after repairs.
NOTE: If concern is that indicator never illuminates, check bulb before performing system tests. See USING HYBRID ELECTRONIC CLUSTER  under RETRIEVING DIAGNOSTIC TROUBLE CODES in SELF-DIAGNOSTIC SYSTEM. This will command all instrument cluster bulbs and LEDs to illuminate.
NOTE: For Natural Gas Vehicle (NGV) specific information, see INSTRUMENT PANELS - ANALOG - F150 - CNG article. For Bi-Fuel specific information, see INSTRUMENT PANELS - ANALOG - F150 - BI-FUEL article.
SYMPTOM INDEX

Symptom Perform Test
No Communication With Hybrid Electronic Cluster A 
Fuel Sender Open, Shorted Or Inaccurate B 
LOW FUEL Indicator Never Or Always On C 
Oil Gauge Reads Normal With Engine Off (1)
Voltmeter Inaccurate (2)
Oil Pressure Gauge Inaccurate D 
Low Oil Warning Light Stays On & Temperature Gauge Reads Normally E 
Temperature Gauge Inaccurate E 
Temperature Warning Light Flickers, Temperature Gauge Reads Fully Hot (1)
Speedometer/Odometer Inoperative F 
Tachometer Inoperative (1)
Tachometer Inaccurate (1)
Safety Belt Indicator Light Inoperative (Chime Operative) G 
Safety Belt Indicator Light Does Not Operate Correctly (Chime Okay) H 
DOOR AJAR Light Inoperative (Chime Okay) I 
DOOR AJAR Light Does Not Operate Correctly (Chime Okay) J 
BRAKE Warning Light Inoperative Or Always On K 
Charging System Indicator Light Inoperative Or Always On L 
4X4 Indicator Light Inoperative Or Always On M 
LOW RANGE Light Inoperative Or Always On M 
High Beam Indicator Light Inoperative Or Always On N 
Air Bag Warning Light Inoperative Or Always On (3)
ABS Warning Light Inoperative Or Always On O 
SERVICE ENGINE SOON Light Inoperative Or Always On P 
Turn/Hazard Indicator Light Inoperative Or Always On Q 
Speed Control Indicator Is Never On R 
THEFT Indicator Light Inoperative Or Always On (4)
Integrated Circuit Display Inoperative Or Erratic (5)
Boost Gauge Inoperative (F150 Lightning Only) S 
Check Fuel Cap Indicator Inoperative T 
CHECK GAGE Indicator Is Inoperative/Always On U 
Instrument Cluster Inoperative V 
(1) Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system.
(2) See GENERATORS & REGULATORS article in ELECTRICAL.
(3) See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.
(4) See PASSIVE ANTI-THEFT SYSTEMS - BLACKWOOD & F150 article.
(5) Perform instrument cluster self-test. See Using Hybrid Electronic Cluster under RETRIEVING DIAGNOSTIC TROUBLE CODES in SELF-DIAGNOSTIC SYSTEMS.
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