2006 MERCEDES-BENZ SPRINTER check engine

TEST ACTION APPLICABILITY
5 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and O2 Sensor harness connector cavities 1,
2, 3, 5, and 6.
Is the resistance above 1000 ohms for each measurement?All
Ye s!Go To 6
No!Repair the circuit(s) that measured below 1000 ohms for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
6 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the ECM harness connectors.
NOTE: The circuits connecting the O2 Sensor and the ECM are single
circuits and do not contain any splices. There should be NO continuity from
one circuit to the other.
Using an ohmmeter, check the O2 Sensor circuits for shorts together (resistance
below 1000 ohms)..
Is the resistance from any O2 Sensor circuit to another below 1000 ohms?All
Ye s!Repair the circuits that measured below 1000 ohms for a short
together.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 7
7 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the Engine Control Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the Engine Control Relay
connector.
Turn the ignition on.
Measure the voltage of O2 Sensor harness connector cavities 1, 2, 3, 5, and 6.
Is the voltage below 1.0 volts for each measurement?All
Ye s!Go To 8
No!Repair the circuit(s) that measured below 1000 ohms for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
8 Turn the ignition off.
Replace the O2 Sensor in accordance with the Service Information.
Turn the ignition on.
With the DRBIIIt, erase the ECM DTCs.
Test drive the vehicle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Replace the ECM in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No!Test Complete.
136
DRIVEABILITY - DIESEL
P2026-O2 SENSOR CIRCUIT FAULT ÐContinued

Symptom List:
P2034-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO HIGH
P2034-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO LOW
P2036-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO HIGH
P2036-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO LOW
P2038-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO HIGH
P2038-O2 SENSOR CIRCUIT CALIBRATION VALUE TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2034-O2 SENSOR CIRCUIT
CALIBRATION VALUE TOO HIGH.
POSSIBLE CAUSES
CHECKING CIRCUIT INTEGRITY
O2 SENSOR
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Using the Service Information wiring diagrams, inspect the wiring and connectors
between the ECM and the O2 sensor for damage, corrosion, poor terminal contact or
other problems.
Were any problems found?All
Ye s!Clean, repair or replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 2
2NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off for 10 seconds.
Test drive the vehicle.
Monitor the DRB for ECM DTCs.
Did this DTC set again?All
Ye s!Replace the Oxygen Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 3
138
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
1NOTE: If DTC P1611, P2306 or P2332 is present with this DTC, diagnose
DTCs P1611, P2306 or P2332 before diagnosing this DTC.
NOTE: The Timing Belt/Chain must be correctly installed and operational
before diagnosis can be made. Refer to the Service Information to ensure
the timing belt is properly installed.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIIIt, erase the ECM DTCs.
Attempt to start the engine cranking the engine for at least 7 seconds.
With the DRBIIIt, read the ECM DTCs.
Does the DRBIIItdisplay this DTC?All
Ye s!Go To 4
No!Go To 2
2 Turn the ignition on.
With the DRBIIIt, erase the ECM DTCs.
Test drive the vehicle.
With the DRBIIIt, read the ECM DTCs.
Does the DRBIIItdisplay this DTC?All
Ye s!Go To 3
No!Go To 16
3 Turn the ignition off.
Disconnect the Camshaft Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor Signal circuit.
Select the appropriate voltage reading.All
Voltage is above 5.4 volts.
Go To 4
Voltage is between 4.7 and 5.4 volts.
Go To 5
Voltage is below 4.7 volts.
Go To 13
141
DRIVEABILITY - DIESEL
P2043-CAMSHAFT POSITION SENSOR CIRCUIT OPEN CIRCUIT Ð
Continued

TEST ACTION APPLICABILITY
16WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Remove the CMP Sensor and the CKP Sensor, checking for loose mounting screws
and debris on the sensor magnets that can corrupt the sensor signal.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?All
Ye s!Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Test Complete.
145
DRIVEABILITY - DIESEL
P2043-CAMSHAFT POSITION SENSOR CIRCUIT OPEN CIRCUIT Ð
Continued

Symptom List:
P2045-CRANKSHAFT POSITION SENSOR CIRCUIT LOST SIGNAL
P2045-CRANKSHAFT POSITION SENSOR CIRCUIT SIGNAL PLAU-
SIBILITY
P2322-CRANKSHAFT POSITION SENSOR PLAUSIBILITY
P2343-CKP PLAUSIBILITY
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2045-CRANKSHAFT POSITION
SENSOR CIRCUIT LOST SIGNAL.
POSSIBLE CAUSES
CKP MOUNTING AND FLYWHEEL
CRANKSHAFT POSITION SENSOR
ENGINE CONTROL MODULE
OPEN SHIELD CIRCUIT
INTERMITTENT CONDITION
CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT(S) SHORTED TO GROUND
CKP SENSOR CIRCUITS SHORTED TOGETHER
CKP SENSOR SIGNAL CIRCUITS OPEN
CKP SENSOR SIGNAL CIRCUIT(S) SHORTED TO VOLTAGE
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Attempt to start the engine.
Did the engine start?All
Ye s!Go To 2
No!Go To 3
146
DRIVEABILITY - DIESEL

Symptom:
P2062-ENGINE OIL SENSOR MONITORING ERROR
POSSIBLE CAUSES
ENGINE OIL SENSOR
VERIFY THE CURRENT DTC
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Check the engine oil level. Add or remove as necessary to obtain proper engine oil
level.
Start the engine and allow it to reach operating temperature.
Test drive the vehicle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Replace the Engine Oil Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Test complete.
Perform ROAD TEST VERIFICATION - VER-2.
149
DRIVEABILITY - DIESEL

Symptom List:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY
P2355-EGR FLOW RATE IS TOO HIGH
P2355-EGR FLOW RATE IS TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2066-MASS AIR FLOW SENSOR
PLAUSIBILITY.
When Monitored and Set Condition:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY
When Monitored: With the engine running.
Set Condition: The ECM detects a rationality problem with the MAF Sensor or excessive
EGR flow.
POSSIBLE CAUSES
AIR FILTER
AIR RESTRICTION
CHECKING FOR AIR LEAKS
EGR ACTUATION - 1200 RPM
EGR VALVE
MAF SENSOR
MAF SENSOR READING - 3OOO RPM
INTERMITTENT CONDITION
EGR RESTRICTION
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC set again?All
Ye s!Go To 2
No!Go To 10
150
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
2 Start and idle the engine.
With the DRBIIItin Sensors, read the MAF mg/strk and compare it to the MAF
SPEC mg/strk with the engine at idle.
NOTE: The MAF Sensor reading should be within 5% of the MAF Spec
reading.
Is the MAF Sensor reading within 5% of the MAF Spec?All
Ye s!Go To 3
No!Go To 7
3 Place the transmission in Park or Neutral for this test.
Start the engine and increase engine the engine speed to 3000 RPM.
With the DRBIIItin Sensors, read the MAF mg/strk and compare it to the MAF
SPEC mg/strk with the engine speed at 3000 RPM.
NOTE: The MAF Sensor reading should be within 5% of the MAF Spec
reading.
Is the MAF Sensor reading within 5% of the MAF Spec?All
Ye s!Go To 4
No!Go To 7
4NOTE: Inspect the complete exhaust system for restriction. Restrictions in
the exhaust system can cause improper EGR flow. Repair as necessary
Allow the engine to idle until the engine reaches operating temperature.
With the DRBIIIt, actuate the EGR Positioner with the engine idling.
NOTE: The EGR Positioner will actuate from 5% to 95%. With the engine
idling at approximately 680 RPM the MAF reading should switch a mini-
mum of 200 mg/strk between 5% and 95% of EGR actuation.
Note the MAF readings.
Does the MAF switch a minimum of 200 mg/strk between 5% and 95% of EGR
actuation?All
Ye s!Go To 5
No!Go To 6
5 Allow the engine to idle until the engine reaches operating temperature.
With the DRBIIIt, actuate the EGR Positioner with the engine speed at 1200 RPM.
NOTE: The EGR Positioner will actuate from 5% to 95%. With the engine
speed at approximately 1200 RPM the MAF reading should switch a mini-
mum of 200 mg/strk between 5% and 95% of EGR actuation.
Note the MAF readings.
Does the MAF switch a minimum of 200 mg/strk between 5% and 95% of EGR
actuation?All
Ye s!No problem found. Test complete.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 6
6 Turn the ignition off.
Remove the EGR valve and check the valve and flow passages for debris or other
restrictions.
Were any problems found?All
Ye s!Clean or repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No!Replace the EGR Valve.
Perform ROAD TEST VERIFICATION - VER-2.
151
DRIVEABILITY - DIESEL
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY ÐContinued