TM-9-2320-362-14&P HMMWV Technical Manual Electrical Environmental System (EES) Download
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TM 9-2320-362-14&P Table 3-2. Unit Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 7. COOLANT TEMPERATURE GAGE DISPLAYS NORNAL READING AND STATUS INDICATOR ALARM AND LIGHT Condition: ARE ON light (REFER To FIGURES 3-1 THRU 3-3) engine has been running 10 to 15 minutes. Both and alarm tests on status indicator are normal. NOTE ● When measuring voltage, measure against ground. ● Normal coolant temperature is 190-230° F. ● Before starting procedure, see para 1-1. Step 1. Disconnect cable W64 from connector 12J1 on tach/hourmeter box . Step 2. Using multimeter, measure voltage at connector 12J1, pin "A", on tach/hourmeter box. If multimeter displays correct voltage (fig 3-3), go to step 3. If multimeter does 3), go to step 5. Step 3. Reconnect cable W64 to box . Disconnect cable NOT display correct voltage (fig 3- connector 12J1 on tach/hourmeter W64 from connector on shelter. Step 4. Using multimeter, measure voltage at cable W64, pin “A.” If multimeter displays correct voltage (fig 3-3), refer to system manual for further troubleshooting. If multimeter does NOT display correct voltage (fig 3- 3), replace faulty cable assembly W64 (para 3-25). Step 5. Reconnect cable W64 to connector 12J1 on tach/hourmeter box . Remove engine access cover and disconnect safety lanyard. Disconnect cable W66 from connector 12J2 on tach/hourmeter box. Step 6. Using multimeter, measure voltage at cable W66, pin “A.” If multimeter displays replace faulty harness If multimeter does NOT 3), go to step 7. correct voltage (fig 3-3), assembly (para 3-20). display correct voltage (fig 3- . 3-18