TOOL GP 8T0461 - Caterpillar

Ignition System Checks
1: Check for spark.a. Check spark plugs to see if operating properly. Expected Result: Spark plugs are operating properly. Result:* Spark plugs are operating properly. Proceed to next step.* Spark plugs are not operating properly. Proceed to STEP 5.2: Check ignition timinga. Check ignition timing. Expected Result: Engine timing is correct. Result:* Engine timing is not correct. Proceed to next step.* Engine timing is correct. Proceed to STEP 9.3: Check the ignition system's magnetic pickup.
(1) 6V7070 Multimeter. (2) DIS magnetic pickup. (3) Magnet.a. Connect 12 VDC to the magnetic pickup and the 6V7070 Multimeter.b. Place the N-pole end of the magnet next to the magnetic pickup as shown in the illustration. Re-install in threaded hole in the digital ignition system shield. The pickup is to be backed out 3/4 turn from disc surface. Expected Results: Multimeter measures a low resistance for the magnetic pickup. Result:* Multimeter measures a low resistance for the magnetic pickup. Proceed to next step.* Multimeter does not measures a low resistance for the magnetic pickup. Adjust and/or replace magnetic pickup. STOP.4: Check wiring.a. check for loose connections, etc. Expected Result: No continuity. Result:* No continuity. Check connections. Repair or replace wiring if necessary. STOP.* Continuity. Replace ignition module. STOP.5: Check spark plug and ignition leads.a. Check for loose connections, etc. Expected Result: Loose connection. Result:* Loose connections. Secure connections. STOP.* Firmly connected. Proceed to next step.6: Check supply voltage of ignition system.a. check voltage. Expected Result: No voltage. Result:* No voltage. Check connections. Repair or replace wiring. STOP.* Voltage present. Proceed to next step.7: Check DIS 10 pin connector.a. Check resistance of the Digital Ignition System (DIS) connector with the 6V7070 Multimeter. Refer to the chart for the proper leads. Expected Result: Resistance is above 250000 Ohms Result:* Resistance is above 250000 Ohms. Proceed to next step.* Resistance is not above 250000 Ohms. Replace ignition module. STOP.8: Check DIS 6 pin connector.a. Check resistance of the Digital Ignition System (DIS) connector with the 6V7070 Multimeter.Measure the resistance between pin E and pin F. Expected Result: Resistance is above 1000 Ohms. Result(s): Resistance is above 1000 Ohms.Proceed to next step. Resistance is not above 1000 Ohms.Replace ignition module.9: Check throttle valve.a. Turn key ON, engine OFF.b. Check for movement during the self calibration mode of the governor. Expected Result: No movement. Result(s):* No movement of the throttle valve. Refer to the Governor Troubleshooting Guide. STOP.* Movement of the throttle valve. Refer to check the engine. STOP.