Engine Controls - Low Power/Poor Accel./MIL ON/DTC's Set
NUMBER: 18-020-05GROUP: Vehicle Performance
DATE: May 5, 2005
SUBJECT:
Engine Air Intake System Diagnosis, MIL Illumination and Diagnostic Trouble Codes P0110, P2670, P2671, and P2672
OVERVIEW:
This bulletin provides a description of the air intake system and replacing the Intake Air Temperature sensor if necessary.
MODELS:
2004 - 2005 (VA) Sprinter
SYMPTOM/CONDITION:
^ MIL Illumination with DTC's P0110, P2670, P2671, and/or P2672.
^ The engine may lack power.
^ Acceleration may be unsteady.
DISCUSSION:
NOTE:
For clarification in this document, "INLET" refers to the air flow before the turbocharger and "INTAKE" refers to the air flow after the turbocharger.
The following information describes the components and functionality of the Sprinter Engine Air Intake System and is designed to assist with proper diagnosis and parts specification of the various Engine Air Intake System components.
NOTE:
The numbers in parenthesis refer to the call out numbers in (Fig. 1).
^ The air needed for engine combustion is drawn in through the slots in the right front fender. This inlet is connected with a plastic hose (1) to the lower part of the air filter housing.
^ The air flows through the horizontal air filter (15) from the bottom to the top. A sensor (16) in the upper part of the air filter housing measures the air pressure.
^ The air leaves the filter housing through the Mass Air Flow (MAF) sensor (2), which measures both mass air flow and air temperature (Inlet Air Temperature). The MAF is connected with a plastic hose (3) to the turbocharger (4), where the air is compressed.
^ After passing through the turbocharger, air is channeled through a resonator and a rubber hose (14) to the intercooler (12).
^ After passing through the intercooler, the air flows through a rubber hose (11) to a plastic tube (9), which contains a sensor for the temperature of the boosted air (Intake Air Temperature) (10).
^ Further up in the tube (9) but not directly in the air flow, another sensor measures the pressure of the boosted air (7).
^ The final rubber hose (8) channels the air to the intake manifold (6).
^ Also included in the system is a sensor that measures atmospheric pressure which is integrated into the engine controller (5).
^ The ambient temperature (13), is used for the Heating, Ventilation, and Air Conditioning (HVAC) system only. The ambient temperature sensor is located under the front license plate holder.
^ There are 7 sensors total; 3 for pressure, 1 for mass air flow, 2 for engine temperature, and 1 for ambient temperature (for HVAC operation only) (Fig. 1).
NOMENCLATURE:
The nomenclature describing the components of the Sprinter Engine Air Intake System is not consistent throughout various systems. The following table clarifies sensor functions and descriptions, including Labor Operations, Part Numbers and nomenclature for diagnostics and parts specification. The numbers in the very left column of the table correlate to Air Intake System diagram (Fig. 1).
DIAGNOSIS
1. Open the hood, install a battery charger and verify that the charging rate provides approximately 13.5 volts.
NOTE:
Engine oil overfilling creates too much oil mist in the air intake system coming through the crankcase ventilation hose. This may influence or harm several air intake sensors. Please check the oil level with the engine and the oil at normal operating temperature (unless it is a cold engine dip-stick marked by a yellow handle on the engine oil dip-stick) and adjust if necessary.
2. Using the DRBIII(R), perform a "Vehicle Module Scan". Record any DTC's on the repair order and then erase the DTC's.
NOTE:
The DTC's in the table above may be related to the Intake Air Temperature sensor even though it is not part of the DTC description.
NOTE:
The DTC P2672 description refers to the Inlet Air Temperature sensor (MAF) and not the Ambient Air Temperature sensor (under license plate holder).
3. Turn the ignition to the "Run" position (do not start the engine). Using the DRBIII(R) from the "Engine Menu", select "Sensor Display", verify that the Intake Air Temperature is reading ambient temperature.
a. If the Intake Air Temperature is not within +/- 5° C (+/- 10°F) of ambient temperature, proceed to Repair Procedure.
b. If the Intake Air Temperature sensor is within +/- 5° (+/- 10°F) of ambient temperature, further diagnosis is necessary and this bulletin does not apply.
PARTS REQUIRED
SPECIAL TOOLS/EQUIPMENT REQUIRED:
REPAIR PROCEDURE:
1. Replace the Intake Air Temperature sensor as follows:
a. Make sure the ignition switch is in the "Off" position.
b. Disconnect the intake air temperature sensor electrical connector.
c. Remove the intake air temperature sensor (Fig. 2).
d. Install the new intake air temperature sensor, p/n 05174042AA.
e. Connect the intake air temperature sensor electrical connector.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.