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 U029D-00 being current or being past on more than 1 count on the CONSULT screen.
Is DTC U029D-00 detected as current or past for more than 1 count?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
CHECK FOR CORRECT ELECTRICAL SYSTEM VOLTAGE SETTING IN CONSULT
1. Turn ignition switch ON.
2. Connect CONSULT and make sure the electrical system voltage setting is correct for the engine configuration.
  NOTE: To check the voltage configuration of the engine, disconnect ECM connector E93 and measure the voltage from ECM connector E93 terminal 83 to ground.
Is the electrical system voltage setting correct for the engine configuration?

YES

GO TO 3 .

NO

Use CONSULT to configure the electrical system voltage to match the engine configuration.
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC U010E-00 being current or being past on more than 1 count on the CONSULT screen.
Is DTC U010E-00 detected as current or past for more than 1 count?

YES

GO TO 10 .

NO

GO TO 4 .
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTCs U0106-00, U029D-00, U02A2-00, U1611-00 or U1612-00 being current or being past on more than 1 count on the CONSULT screen.
Are more than one of the above DTCs current or past?

YES

GO TO 9 .

NO

GO TO 5 .
INSPECT INTAKE NOx SENSOR AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect intake NOx sensor harness connector C31.
3. Inspect the intake NOx sensor 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 6 .

NO

Repair or replace error-detected parts.

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect intake NOx sensor harness connector C31.
Turn ignition switch ON.

Check voltage between intake NOx sensor connector C31 terminal 4 and terminal 3.

Intake NOx sensor connector C31		Condition	Voltage (Approx.)
Terminal	Terminal
4	3	Ignition switch ON	> 10.8 V
		Cranking engine

Is the inspection result normal?

YES

GO TO 8.

GO TO 7.

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect intake NOx sensor harness connector C31.
Turn ignition switch ON.

Check voltage between intake NOx sensor connector C31 terminal 4 and ground.

Intake NOx sensor		Ground	Condition	Voltage (Approx.)
Connector	Terminal
C31	4	(-)	Ignition switch ON	> 10.8 V
			Cranking engine

Is the inspection result normal?

YES

An open or high resistance is present on the ground circuit. Repair or replace error-detected parts.

An open or high resistance is present on the battery supply circuit. Repair or replace error-detected parts.

CHECK FOR AN OPEN OR SHORT CIRCUIT IN THE INTAKE NOx SENSOR DATA LINK

Turn ignition switch OFF.
Disconnect the intake NOx sensor harness connector C31.
Disconnect the data link adapter from the service data link connector harness connector.

Measure the resistance between intake NOx sensor harness connector C31 terminal 1 and 2.

Intake NOx sensor connector C31		Resistance
Terminal	Terminal	Resistance
1	2	54 - 66 Ω

Is the inspection result normal?

YES

Replace intake NOx sensor. Refer to Removal and Installation .

GO TO 10.

INSPECT IPDM E/R AND FUSES
1. Turn ignition switch OFF.
2. Inspect the IPDM E/R and fuses for the following:
  - Blown power supply fuses
  - Power supply fuse for cracks, burns, corrosion, or discolorations
  - Corrosion
  - Loose or expanded pins
Is the inspection result normal?

YES

GO TO 10.

NO

Repair or replace error-detected parts.

CHECK FOR TERMINATING RESISTANCE

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

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

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

Is the inspection result normal?

YES

GO TO 12.

GO TO 11.

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.
Disconnect intake NOx sensor harness connector C31.

Measure the resistance between intake NOx sensor connector C31 terminal 1 and terminal 2.

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

Is the inspection result normal?

YES

A malfunction has been detected in the after treatment side of the CAN2 communication line circuit. Refer to Trouble Diagnosis Flow Chart .

A malfunction has been detected in the engine side of the CAN2 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 13.

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 error-detected parts.