Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
3. Check for DTC U11C1-00 being current on the CONSULT screen.
Is DTC U11C1-00 detected as current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
3. Check for other DTCs being current on the CONSULT screen.
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 3 .
INSPECT DEF CONTROL MODULE AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect DEF control module harness connector C35.
3. Inspect the DEF control module connector pins for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.

CHECK FOR AN OPEN OR SHORT CIRCUIT IN THE DEF CONTROL MODULE DATA LINK

Turn ignition switch OFF.
Disconnect the DEF control module harness connector C35.
Disconnect the data link adapter from the service data link harness connector.

Measure the resistance between DEF control module connector C35 terminals 5 and 6.

DEF control module			Resistance
Connector	Terminal
C35	5	6	54 - 66 Ω

Is the inspection result normal?

YES

Replace DEF control module. Refer to Removal and Installation .

GO TO 5.

CHECK FOR TERMINATING RESISTANCE

Turn ignition switch OFF.
Disconnect the data link adapter from the service data link harness connector.

Measure the resistance between Cummins data link connector F190 terminals 1 and 2.

Cummins data link connector			Resistance
Connector	Terminal
F190	1	2	54 - 66 Ω

Is the inspection result normal?

YES

GO TO 7.

GO TO 6.

CHECK FOR TERMINATING RESISTANCE

Turn ignition switch OFF.
Disconnect the data link adapter from the service data link connector harness connector.
Disconnect the ECM harness connector E93.

Measure the resistance between Cummins data link connector F190 terminals 1 and 2.

Cummins data link connector			Resistance
Connector	Terminal
F190	1	2	108 - 132 Ω

Is the inspection result normal?

YES

A malfunction has been detected in the after treatment side of the CAN 2 communication line circuit. Refer to Trouble Diagnosis Flow Chart .

A malfunction has been detected in the engine side of the CAN 2 communication line circuit. Refer to Trouble Diagnosis Flow Chart .

CHECK CAN2 COMMUNICATION LINE (+) FOR SHORT

Turn ignition switch ON.

Check voltage between Cummins data link connector F190 terminal 1 and ground.

Cummins data link connector

Ground

Voltage

(Approx.)

Connector

Terminal

F190

0.1 - 4.5V

Is the inspection result normal?

YES

GO TO 8.

Repair or replace error-detected parts.

CHECK CAN2 COMMUNICATION LINE (-) FOR SHORT

Turn ignition switch ON.

Check voltage between Cummins data link connector F190 terminal 2 and ground.

Cummins data link connector

Ground

Voltage

(Approx.)

Connector

Terminal

F190

0.1 - 4.5V

Is the inspection result normal?

YES

Refer to Intermittent Incident .

Repair or replace harness for a short.