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 FOR CURRENT DTC
1. Turn ignition switch ON.
2. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
3. Check if any of the following DTCs are "current" or "past":
  - P007B-00
  - P0107-00
  - P0108-00
  - P0237-00
  - P0238-00
  - P1191-00
  - P1192-00
  - P1193-00
Is applicable DTC current or past?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK FOR TURBOCHARGER RELATED DTC
1. Using CONSULT, check for other "ENGINE" diagnostic trouble codes.
2. Look for "current" DTCs related to turbocharger.
Is any applicable current DTC?

YES

Refer to DTC Index .

NO

GO TO 3 .
INSPECT VACUUM HOSES
Inspect for cracks, collapsed hose or other damage to the vacuum hoses at the following locations:
- Vacuum pump
- Compressor bypass valve solenoid
- Compressor bypass valve actuator
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.
VERIFY THE BAROMETRIC PRESSURE SENSOR ACCURACY
1. Using CONSULT, access "ENGINE" and check "TURBO COMP INLET PRESS" under "Data Monitor".
2. Compare turbocharger compressor intake pressure to the local barometric pressure.
Is measured reading within ± 2 kPa (0.3 psi) of local barometric pressure reading?

YES

GO TO 5 .

NO
- Replace the turbocharger compressor intake pressure/temperature sensor. Refer to Removal and Installation .
- GO TO 19.

VERIFY VACUUM PUMP OUTPUT

Start the engine.
Connect a hand pump or a vacuum gauge to the vacuum pump inlet.
Verify the vacuum pump output is sufficient:

Minimum required vacuum

-40 kPa (-0.408 kg/cm ² , -5.8 psi)

Is the vacuum supply sufficient?

YES

GO TO 6 .

Replace the vacuum pump. Refer to Removal and Installation .
GO TO 19 .

VERIFY THE COMPRESSOR BYPASS VALVE ACTUATOR
1. Stop the engine.
2. Turn ignition switch ON.
3. Using CONSULT, monitor the compressor bypass valve actuator.
4. Use a hand pump to provide vacuum to the compressor bypass valve actuator.
5. Verify that the compressor bypass valve moves to both linkage stops.
Does the compressor bypass valve linkage move from stop to stop?

YES

GO TO 7 .

NO
- Remove the obstruction or replace the compressor bypass valve. Refer to Removal and Installation .
- GO TO 19 .
VERIFY CHARGE-AIR COOLER OUTLET PRESSURE DURING ENGINE OPERATION
1. Verify the charge-air cooler outlet pressure.
2. Using CONSULT, monitor and log the following:
  - Engine speed
  - Charge-air cooler outlet pressure
  - Compressor bypass valve
3. Start the engine
4. Override compressor bypass valve to OPEN.
5. Use the accelerator pedal to raise the engine speed to 2, 000 RPM and hold for 20 seconds.
6. Return the engine speed to idle.
7. Repeat above steps with compressor bypass valve override set to CLOSED.
8. Compare charge-air cooler outlet pressure values at 2, 000 RPM with valve OPEN vs. CLOSED.
Charge-air cooler outlet pressure increased by 50 kPa (7.25 psi) or more at 2, 000 RPM?

YES

GO TO 8 .

NO

GO TO 10 .
VERIFY THE TURBOCHARGER SPEED SENSOR ACCURACY
1. Verify the turbocharger speed sensor.
2. Using CONSULT, monitor and log the following:
  - Engine speed.
  - Turbocharger speed.
  - Compressor bypass valve.
3. Start the engine.
4. Override compressor bypass valve to OPEN.
5. Use the accelerator pedal to raise the engine speed to 2, 000 RPM and hold for 20 seconds.
6. Return the engine speed to idle.
7. Repeat above steps with compressor bypass valve override set to CLOSED.
8. Compare turbocharger speed at 2, 000 RPM with valve OPEN vs. CLOSED.
Turbocharger speed increased from less than 130, 000 RPM to between 140, 000 and 160, 000 RPM?

YES

GO TO 9 .

NO
- Replace the malfunctioning turbocharger speed sensor. Refer to Removal and Installation .
- GO TO 19 .
VERIFY LOW PRESSURE TURBOCHARGER BOOST PRESSURE SENSOR ACCURACY
1. Verify the low-pressure turbocharger boost speed sensor.
2. Using CONSULT, monitor and log the following:
  - Engine speed.
  - Low-pressure turbocharger boost pressure.
  - Charge-air cooler outlet pressure.
  - Compressor bypass valve.
3. Start the engine.
4. Override compressor bypass valve to OPEN.
5. Use the accelerator pedal to raise the engine speed to 2, 000 RPM and hold for 20 seconds.
6. Return the engine speed to idle.
7. Repeat above steps with compressor bypass valve override set to CLOSED.
8. Compare low-pressure turbocharger boost pressure values at 2, 000 RPM with valve OPEN vs. CLOSED.
From open to closed valve, does turbocharger boost pressure increased by 5 kPa (0.73 psi) or more at 2, 000 RPM?

YES

GO TO 10 .

NO
- Replace the Low-Pressure Turbocharger Boost Pressure Sensor. Refer to Removal and Installation .
- GO TO 19 .
INSPECT THE ENGINE CHARGE-AIR COOLER OUTLET PRESSURE/TEMPERATURE SENSOR AND ELECTRICAL CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect the engine charge-air cooler outlet pressure/temperature sensor.
3. Inspect connector 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 11 .

NO
- Repair or replace error-detected parts.
- GO TO 19 .
VERIFY THE CHARGE-AIR COOLER OUTLET PRESSURE SENSOR ACCURACY AT KEY ON
1. Reconnect the charge-air cooler outlet pressure/temperature sensor.
2. Verify the charge-air cooler outlet pressure sensor accuracy.
3. Turn ignition switch ON.
4. Check charge air cooler outlet pressure Data Monitor item on the CONSULT screen.
Is the reading within ±10.3 kPa (1.5 psi) of local barometric pressure?

YES

GO TO 17 .

NO

GO TO 12 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect the engine charge-air cooler outlet pressure/temperature sensor.
3. Turn ignition switch ON.
4. Wait 30 seconds.
5. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P0107-00 DTC current?

YES

GO TO 13 .

NO

GO TO 14 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Connect a jumper wire between the engine charge air cooler outlet pressure/temperature sensor connector F140 pressure signal circuit terminal 1 and power circuit terminal 2.
3. Turn ignition switch ON.
4. Wait 30 seconds.
5. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P0108-00 DTC current?

YES
- Replace the engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .
- GO TO 19.
NO

GO TO 14 .
INSPECT ECM AND ELECTRICAL CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect the ECM connector F101.
3. Inspect connector 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 15 .

NO
- Repair or replace error-detected parts.
- GO TO 19 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch ON.
2. Wait 30 seconds.
3. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P0107-00DTC current?

YES

GO TO 16 .

NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 19 .
CHECK THE CIRCUIT RESPONSE
CAUTION:
When probing or jumping between connector pins or terminals:
- Always use extreme care or connector damage could result. Do not bend or damage connector pins and terminals. Damaged connectors, pins or terminals could result in additional issues or difficult-to-diagnose intermittent incidents.
- Do not probe or short unintended circuits or component and/or control module damage could result.
1. Turn ignition switch OFF.
2. Connect a jumper wire between ECM connector F101 pins 1 and 2.
3. Turn ignition switch ON.
4. Wait 30 seconds.
5. Using CONSULT, check for current ENGINE diagnostic trouble codes.
Is P0108-00 DTC current?

YES
- Repair or replace the engine harness for high resistance or short circuit.
- GO TO 19 .
NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 19 .
CHECK THE AIR INTAKE FOR LEAKS
1. Remove the jumper wire.
2. Connect all harness connectors.
3. Start the engine.
4. Check for air leaks in connections and hoses between the turbocharger outlet and charge-air cooler inlet.
Is air leak present?

YES
- Repair or replace the leaking component.
- GO TO 19 .
NO

GO TO 18 .
CHECK THE INTAKE AND EXHAUST FOR RESTRICTIONS
Inspect the intake and the exhaust system for restrictions.

Is exhaust or intake restriction found?

YES
- Repair or replace the restricted component.
- GO TO 19 .
NO
- An in-range malfunction of the charge-air cooler outlet pressure/temperature sensor has been detected. Replace the engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .
- GO TO 19.
ERASE CURRENT DTCS
1. Turn ignition switch ON (engine OFF).
2. Using CONSULT, erase ENGINE diagnostic trouble codes.
3. Operate the engine within the "Conditions for Clearing DTC".
4. Using CONSULT check for current ENGINE diagnostic trouble codes.
Is P22CE-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to Diagnosis Procedure .

NO

Repair complete.