TANK GP-HYDRAULIC 4423281 - Caterpillar

Expected Result: No continuity. Result:* No continuity. Repair or replace wiring if necessary.* Continuity. Proceed to next step.6: Check heater voltage.a. Turn key On, engine off.b. Check voltage between S580(white) and S581(white). Expected result: No voltage. Result:* No voltage. Replace ECM. STOP.* Voltage. Go back to STEP 3.7: Check oxygen sensor voltage.a. Check voltage of sensor between S582(gray) and S583(black). Expected Result: 450 mV constant voltage. Result(s):* 450 mV constant voltage.: Replace the oxygen sensor. STOP.* Voltage varies. Proceed to next step.Maps, IMTS And Sensors
Fault Code 33 - Map High Fault Code 34 - Map Low Fault Code 23 - Mat Sensor Low Fault Code 13 - Oxygen Sensor No Signal.
1: Check if "Closed Loop".a. Hook up monitoring software.b. Check display screen. Expected Result: "Closed loop" displayed. Result:* "Closed loop" displayed. Proceed to Adjusting Fuel For Proper AFRC.* "Closed loop" not displayed. Proceed to next step.2: Check for faults.a. Hook up monitoring software.b. Check display screen. Expected Result: No faults. Result:* No faults. Proceed to next step.* Faults. Proceed to Fault Codes.3: Check continuity between ECM, Sensors, and Caterpillar Module Interface (CMI)a. Check CMI control pins with MAP and IMTS pins. b. Check ECM pins with MAP and IMTS pins. Expected Result: Continuity. Result:* Continuity. Proceed to next step.* No continuity. Check connections. Repair or replace wiring if necessary. STOP.4: Check output voltage of MAP, IMT sensors.a. Check voltage of MAP sensor pin C to pin B.b. Check voltage of IMT sensor pin C to pin B. Expected Result: No output voltage. Result:* No output voltage. Replace the appropriate sensor. STOP.* Output voltage. Replace the ECM.Adjusting Fuel For Proper Air/Fuel Mixture
Check stepper motor for correct movement.a. Hook up the software monitoring system to the ECM.b. Engage the parking brake.c. Key ON, engine ON with the engine in park/neutral, idle the engine.d. Record the motor position.e. Record the C/L readings.f. Press and hold the accelerator down several times.g. Allow the engine to return to idle.h. Record the motor position.i. Record the C/L readings. Expected Result: Not the same motor position. Result:* Not the same motor position. Proceed to next step.* The same motor position. No adjustment needed. STOP.2: Check Mixture.a. Record C/L readings with the engine at 750 rpm. A positive correction number means the mixture is lean. A negative correction number means the mixture is rich. Expected Result: The C/L reading is greater than 20. Result:* The C/L reading is greater than 20. Proceed to next step.* The C/L reading is within 20. Proceed to Run Stall Speed Check.3: Adjust Pressure Regulator.a. If the C/L reading is greater than 20 then turn the adjusting tower screw counterclockwise until the C/L reading is less than 20.b. If the C/L reading is less than -20 then turn the adjusting tower screw clockwise until the C/L reading is greater than 20.STOP.Run Stall Speed Check (Automatic Only)
1: Check Engine RPM.a. Engage the parking brake.b. Press on the service brake pedal.c. Start engine.d. Place transmission in drive.e. Accelerate the