RETAINER 9Y0195 - Caterpillar

Illustration 4 g06300805
The DEF injectors are on the inlet of the Clean Emissions Module (CEM). There are injectors on both inlets of the dual CEM applications.
(17) Aftertreatment #2 DEF pump #1 DEF injector #2 (yellow)
(18) Aftertreatment #2 DEF pump #2 DEF injector #1 (red)
(19) Aftertreatment #1 DEF pump #1 DEF injector #2 (blue)
(20) Aftertreatment #1 DEF pump #2 DEF injector #1 (green)
Illustration 5 g06300806
The DEF injectors are on the inlet of the CEM. There are injectors on both inlets of the dual CEM applications.
(21) Aftertreatment #1 DEF pump #2 DEF injector #4 (green)
(22) Aftertreatment #1 DEF pump #1 DEF injector #3 (blue)
(23) Aftertreatment #2 DEF pump #2 DEF injector #4 (red)
(24) Aftertreatment #2 DEF pump #1 DEF injector #3 (yellow)Probable Causes
Codes
Open circuit
Short circuit
InjectorsRecommended Actions
Table 4
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result : A -5 or -6 code related to the aftertreatment diesel exhaust fluid dosing valve (DEF Injector) is active or logged.
Proceed to Test Step 4.
Result : A -5code that is not related to the aftertreatment diesel exhaust fluid dosing valve (DEF Injector) is active or logged.
Proceed to Test Step 2.
Result : A -6 code that is not related to the aftertreatment diesel exhaust fluid dosing valve (DEF Injector) is active or logged.
Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit
A. Verify that the harness connector is free of debris, free of corrosion and securely connected.
B. Disconnect the solenoid from the harness.
C. Connect a jumper wire between the terminals of the harness connector for the affected coil. The coil is replaced with a short circuit.
Create a Short
Result: A -5 code became active during the electrical checkout. The ECM did not detect the jumper wire. There is an open circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Verify that the repair eliminated the problem.
Result: A -6 code is activated during the electrical checkout. The ECM detected the jumper wire. There is a problem with the solenoid.
Repair: Replace the solenoid.
Verify that the repair eliminated the problem.
3. Check the Wiring for a Short Circuit
A. Disconnect the solenoid from the harness.
Create an Open
Result: A -6 code became active during the electrical checkout. The ECM did not detect the open circuit. There is a short circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Turn the keyswitch to OFF for 2 minutes. The keyswitch must be