VALVE GP 4T3254 - Caterpillar

STEP 1. Check Electronic Locomotive Control Box Test Procedure:Observe the diagnostic lamps which are visible through the lens on the control box lid. Expected Results:SHUTDOWN lamp ON. WHEEL SLIP and GENERATOR LOAD lamps may be ON or OFF depending on locomotive design. All other lamps OFF.
Fig. 1 SHUTDOWN LAMP
Fig. 2 BOX FAULT
Fig. 3 TURN CAL ADJUST OUT
Fig. 4 TURN CAL ADJUST IN
Fig. 5 CAL ADJUST CORRECT
Fig. 6 PERSONALITY MODULE FAULT
Fig. 7 ENGINE SPEED SENSOR FAULT STEP 2. Check Electronic Locomotive Control Box Test Procedure:Disconnect connector J1 (VE connector) from control box. Reconnect and observe the diagnostic indicator lamps. Expected Results:All lamps turn ON for 5 seconds. SHUTDOWN lamp remains ON. STEP 3. Check Power to Electronic Control Box Test Procedure:Disconnect connector J1 (VE connector) from control box. Set a digital multimeter (Cat Service Tool 6V3030) on the 200 VDC scale and connect the probes to measure DC voltage. Use this to measure the DC voltage between pins 8 and 9 of connector J1 at the wiring harness. Expected Results:The voltage is greater than 24 VDC and less than 150 VDC. STEP 4. Check Personality Module CAL Switch Test Procedure:Remove the fitting covering the CAL switch on the Personality Module. (See Service Procedure D.) Use a small screwdriver to turn the switch clockwise (away from the CAL marking). Replace the fitting covering the CAL switch. Observe the diagnostic lamps in the Locomotive Control box. Expected Results:The CAL ADJ (TURN CAL ADJ OUT, CAL ADJ CORRECT and TURN CAL ADJ IN) lamp codes are all OFF. STEP 5. Attempt to Start Engine Test Procedure:Attempt to start the engine in the usual manner. Expected Results:Engine starts and runs normally. STEP 6. Check for intermittent signals Test Procedure:With the engine running in the same manner as when the unexpected shutdown occurred, observe the lamps on the diagnostic lamps on the control box lid. Expected Results:As the engine begins to shutdown, the SHUTDOWN lamp turns ON. STEP 7. Check Operator Shutdown Input Test Procedure:With the Locomotive Control box connected to the wiring harness, and the engine running, measure the DC voltage applied by the locomotive electrical system to the operator shutdown input (applied to connector J1 pin 12) with