TM 9-2320-279-10-1 Controls and Indicators (Cont) Figure 2-5.1. (FHTV Only) Instrument Panel Controls and Indicators (Sheet 2 of 3). Key Control or Indicator Function 11 CHECK ENGINE Indicator Lights (amber) when ECM detects a fault in the engine. Engine must be serviced by maintenance as soon as possible. 12 INTER-AXLE DIFF. LOCK Indicator Lights (orange) when TRACTION CONTROL is in INTER-AXLES DIFF. LOCK position. 13 8X8 DRIVE Indicator Lights (orange) when TRACTION CONTROL is in 8X8 DRIVE position or when TRANSFER CASE is in LO. 14 Air Filter Restriction Indicator Shows condition of air cleaner filter. Lights (red) when filter becomes clogged. VACUUM INCHES H2O window shows degree of restriction. 15 TRACTION CONTROL In left position (INTER-AXLE DIFF. LOCK) locks inter-axle differentials in front and rear tandems. In right position (8X8 DRIVE), engages transfer case drive to front axle. 16 ETHER START Control Injects ether into engine intake manifold for cold weather starting. 17 TRANS CHECK Indicator Lights (yellow) when ECU detects a problem in the transmission that requires maintenance attention as soon as possible. 18 TRANS TEMP Indicator Lights (red) when transmission oil temperature reaches 250_F (121_C). 19 PARK BRAKE Indicator Lights (red) when parking brake is activated. 20 CHECK GAUGES Indicator Lights (amber) when ECM detects a problem in the engine that may cause damage. If indicator is lit, check gages. Change 8 2-10.1/(2-10.2 blank)