Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 135

TEST

ACTION

APPLICABILITY

6

Turn the ignition off.
Disconnect the CKP 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 both CKP Sensor Signal circuits.
Is the voltage below 1.0 volt for both measurements?

All

Yes

→ Go To 7

No

→ Repair the CKP Sensor Signal circuit(s) for a short to voltage.

Perform ROAD TEST VERIFICATION - VER-2.

7

Turn the ignition off.
Using the DRB lab scope, backprobe both of the CKP Sensor Signal circuits at the
ECM harness connector.
NOTE: Refer to Charts and Graphs to view a correct CKP Sensor signal.
Start the engine, if the engine will not start, crank the engine for several seconds
while monitoring the DRB.
Does the DRB display a steady clean CKP Signal pattern for both circuits?

All

Yes

→ Go To 8

No

→ Replace the Crankshaft Position Sensor.

Perform ROAD TEST VERIFICATION - VER-2.

8

Turn the ignition off.
Inspect the CKP Sensor Shield circuit.
Were any problems found?

All

Yes

→ Repair the Shield circuit as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 9

9

Turn the ignition off.
Inspect the CKP Sensor for signs of damage or improper/loose attachment to the
engine.
Inspect the flywheel for excessive dirt contamination or tooth damage which can
cause improper CKP Sensor signal output.
Where any of these problems found?

All

Yes

→ Repair or replace as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

148

DRIVEABILITY - DIESEL

P2045-CRANKSHAFT POSITION SENSOR CIRCUIT LOST SIGNAL —

Continued

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 DRBIII

t, read the ECM DTCs.

Did this DTC set again?

All

Yes

→ 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

1

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 DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC set again?

All

Yes

→ Go To 2

No

→ Go To 10

150

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

2

Start and idle the engine.
With the DRBIII

t in 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

Yes

→ 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 DRBIII

t in 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

Yes

→ Go To 4

No

→ Go To 7

4

NOTE: 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 DRBIII

t, 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

Yes

→ Go To 5

No

→ Go To 6

5

Allow the engine to idle until the engine reaches operating temperature.
With the DRBIII

t, 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

Yes

→ 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

Yes

→ 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 —

Continued