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 U02A2-00 being current or being past for more than 1 count on the CONSULT screen.
Is DTC U0106-00 detected as current or past for more than 1 count?

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 DTC being current on the CONSULT screen.
Is DTC P0687-00 detected as current?

YES

Refer to DTC Description .

NO

GO TO 3 .
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTCs U0106-00, U010C-00, U029D-00, U029E-00, U1611-00 or U1612-00 being current or being past for more than 1 count on the CONSULT screen.
Are DTCs U0106-00, U010C-00, U029D-00, U029E-00, U1611-00 or U1612-00 detected as current or past for more than 1 count?

YES

GO TO 8 .

NO

GO TO 4 .
INSPECT DEF QUALITY SENSOR AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect DEF quality sensor harness connector C203.
3. Inspect the DEF qualify 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 5 .

NO

Repair or replace error-detected parts.

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect DEF quality sensor harness connector C203.
Turn ignition switch ON.

Check voltage between DEF quality sensor connector C203 terminals 1 and 4.

DEF quality sensor connector			Condition	Voltage (Approx.)
Connector	Terminal
C203	1	4	Ignition switch ON	> 10.8 V
			Cranking engine

Is the inspection result normal?

YES

GO TO 7.

GO TO 6.

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect DEF quality sensor harness connector C203.
Turn ignition switch ON.

Check voltage between DEF quality sensor connector C203 terminal 1 and ground.

DEF quality sensor		Ground	Condition	Voltage (Approx.)
Connector	Terminal
C203	1	-	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 DEF QUALITY SENSOR DATA LINK

Turn ignition switch OFF.
Disconnect the DEF quality sensor harness connector C203.
Disconnect the data link adapter from the service data link connector harness connector.

Measure the resistance between DEF quality sensor harness connector C203 terminals 2 and 3.

DEF quality sensor connector			Resistance
Connector	Terminal
C203	2	3	54 - 66 Ω

the inspection result normal?

YES

Replace DEF quality sensor. Refer to Exploded View .

GO TO 9.

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

YES

GO TO 9.

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			Resistance
Connector	Terminal
F190	1	2	54 - 66 Ω

Is the inspection result normal?

YES

GO TO 11.

GO TO 10.

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 terminal 1 and terminal 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 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 12.

A short circuit has been detected in the CAN2 communication line circuit. 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 .

A short circuit has been detected in the CAN2 communication line circuit. Repair or replace error-detected parts.