STEP GP 2977547 - Caterpillar

Table 2
Required Tools
Tool Part Number Part Description Qty
A 398-4987 Probe - Female
(Part of 372-5260 Tool Gp) 2
B 398-4985 Probe - Male
(Part of 372-5260 Tool Gp) 2 Note: The procedures have been listed in order of probability. Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check the Resistance of the DEF Injector
A. Turn the keyswitch to the OFF position. Allow 2 minutes to elapse before proceeding.
B. Disconnect the DEF injector from the applicable harness.
C. Inspect the connector for damage or debris.
D. Connect Tooling A to the DEF injector. The probes must be used to prevent damage to the DEF injector connector.
E. Measure the resistance of the DEF injector.
10 Ohms to 20 Ohms
Result : The resistance of the DEF injector measured between 10 Ohms and 20 Ohms.
Proceed to Test Step 2.
Result : The resistance of the DEF injector did not measure between 10 Ohms and 20 Ohms. A failed DEF injector has been detected.
Repair : Replace the failed DEF injector. Refer to the Disassembly and Assembly, "DEF Injector and Mounting - Remove and Install".
Proceed to Test Step 8.
2. Check for a Short Circuit in the Wiring Harness.
A. Turn the keyswitch to the OFF position. Allow 2 minutes to elapse before proceeding.
B. Disconnect the injector from the applicable harness
C. Connect Tooling B to the DEF injector harness connector. The probes must be used to prevent damage to the connector.
D. Measure the resistance between the two probes.
Note : The reading will measure the resistance in the wiring harness between the DEF injector connector and the DCU.
Ohms
Result : The resistance of the DEF injector wiring harness measured greater than 10K Ohms.
Repair : Connect the injector to the applicable harness.
Proceed to Test Step 3.
Result : The resistance of the DEF injector wiring harness did not measure greater than 10K Ohms.
Repair : There is a short circuit in the wiring harness between the DEF injector connector and the DCU. Repair or replace the wiring harness. Connect the injector to the applicable harness.
Proceed to Test Step 8.
3. Check the Diesel Exhaust Fluid (DEF) Quality.
A. Measure the DEF quality. Refer to Testing and Adjusting, "Diesel Exhaust fluid Quality - Test" for the correct procedure.
DEF
Result : The DEF is not contaminated and the concentration is within the acceptable range.
Proceed to Test Step 4.
Result : The DEF is not contaminated but the concentration is not within the acceptable range.
Repair : Drain the DEF from the tank. Refill the tank with DEF that meets ISO 22241 quality standards.
Proceed to Test Step 8.
Result : The DEF is contaminated.
Repair : Contact the Dealer Solutions Network (DSN) for further information.
4. Perform the "DEF Dosing System Accuracy Test"
A. Use the electronic service tool to perform the "DEF Dosing System Accuracy Test". Refer to Systems Operation, Testing and Adjusting, "Aftertreatment SCR System Dosing - Test" for the correct procedure.
DEF dosing system accuracy test
Result : The quantity collected is below