Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 158

TEST

ACTION

APPLICABILITY

4

NOTE: Prior to performing this test, be sure to check the Glow Plug Relay
operation. Refer to CHECKING GLOW PLUG OPERATION for the related
symptom(s).
Refer to the Service Information and check the Glow Plugs for proper operation.
Are the Glow Plugs operating properly?

All

Yes

→ Go To 5

No

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

5

Inspect the fuel system lines for restrictions, leaks or other problems.
NOTE: Refer to the Service Information to ensure that the fuel system is
properly primed. An unprimed system or excessive air in the supply system
will cause a no-start condition.
Is there any evidence of problems?

All

Yes

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 6

6

Refer to the Service Information and perform the fuel pressure test.
Is the fuel pressure within specification?

All

Yes

→ Go To 7

No

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

7

Inspect the fuel supply for contamination.
Is the fuel contaminated?

All

Yes

→ Refer to the Service Information to remove and replace fuel

throughout the fuel system.
Perform NO START VERIFICATION - VER-1.

No

→ Go To 8

8

Turn the ignition off.
Using the DRBIII

t lab scope, backprobe the CMP Sensor Signal circuit at the ECM

harness connector.
Start the engine, if the engine will not start, crank the engine for several seconds
while monitoring the DRBIII

t.

NOTE: Refer to Charts and Graphs to view a correct CMP Sensor signal.
Does the DRBIII

t display a steady clean CMP Signal pattern?

All

Yes

→ Go To 9

No

→ Perform Test for DTC P2043-Camshaft Position Sensor Circuit

Static Plausibility.
Perform NO START VERIFICATION - VER-1.

240

DRIVEABILITY - DIESEL

*ENGINE CRANKS BUT WILL NOT START —

Continued

TEST

ACTION

APPLICABILITY

9

Turn the ignition off.
Using the DRBIII

t 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 DRBIII

t.

Does the DRBIII

t display a steady clean CKP Signal pattern for each circuit?

All

Yes

→ Go To 10

No

→ Perform Test for DTC P2045-Crankshaft Position Sensor Circuit

Dynamic Plausibility.
Perform NO START VERIFICATION - VER-1.

10

Refer to the Service Information to ensure the Engine Drive Gears/Sprocket are
installed correctly and the camshaft and crankshaft gears are timed correctly.
Were any problems found?

All

Yes

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

No

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform NO START VERIFICATION - VER-1.

241

DRIVEABILITY - DIESEL

*ENGINE CRANKS BUT WILL NOT START —

Continued

Symptom:

*ENGINE WILL NOT CRANK

POSSIBLE CAUSES

BATTERY CABLE HIGH RESISTANCE

BATTERY CABLES

CHECKING ECM POWER AND GROUNDS

CHECKING FOR TCM CODES

ECM

ECM CODES PRESENT

IGNITION SWITCH OUTPUT (START) CIRCUIT OPEN

MECHANICAL PROBLEM

SKREEM CODES PRESENT

STARTER MOTOR

STARTER MOTOR RELAY

STARTER MOTOR RELAY CIRCUIT(S) OPEN

STARTER MOTOR RELAY CIRCUIT(S) SHORTED TO GROUND

STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

STARTER RELAY OUTPUT CIRCUIT OPEN

TEST

ACTION

APPLICABILITY

1

Turn the ignition off.
NOTE: The battery must be fully charged before diagnosing a no crank
condition.
Inspect the battery cables for corrosion, looseness or other problems.
Is there evidence of problems?

All

Yes

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 2

2

Turn the ignition off.
Remove the Starter Motor Relay from the Fuse/Relay Block.
Connect a test light between cavities 85 and 86 of the Starter Motor Relay connector
in the Fuse/Relay Block connector.
While observing the test light, attempt to start the engine.
Did the test light illuminate when turning the ignition switch to the Crank position?

All

Yes

→ Go To 3

No

→ Go To 8

242

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

3

Turn the ignition off.
Remove the Starter Motor Relay from the Fuse/Relay Block.
Using a 12-volt test light connected to ground, check the Ignition Switch Output
(Start) circuit in the Starter Motor Relay connector in the Fuse/Relay Block while
turning the ignition to the Crank/Start position.
Did the test light illuminate while turning the ignition to the Crank/Start position?

All

Yes

→ Go To 4

No

→ Repair the Ignition Switch Output (Start) circuit for an open.

Perform NO START VERIFICATION - VER-1.

4

Turn the ignition off.
Remove the Starter Motor Relay from the Fuse/Relay Block.
Install a substitute relay in place of the Starter Motor Relay.
Attempt to start the engine.
Does the engine crank?

All

Yes

→ Replace the Starter Motor Relay.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 5

5

Turn the ignition off.
Remove the Starter Motor Relay from the Fuse/Relay Block.
Disconnect the Starter Motor Relay Output wire from the Starter Solenoid.
Connect the Starter Motor Relay Output wire (at the Starter) to ground.
Using a 12-volt test light connected to 12-volts, check the Starter Motor Relay Output
circuit at the Starter Motor Relay connector in the Fuse/Relay Block.
Does the test light illuminate brightly?

All

Yes

→ Go To 6

No

→ Repair the Starter Relay Output circuit for an open.

Perform NO START VERIFICATION - VER-1.

6

Using the Service Information, check the battery cables for high resistance.
Did either battery cable have a voltage drop greater than 0.2 volts?

All

Yes

→ Replace the battery cable(s).

Perform NO START VERIFICATION - VER-1.

No

→ Go To 7

7

Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.
Is the crankshaft able to rotate 360°?

All

Yes

→ Replace the Starter Motor.

Perform NO START VERIFICATION - VER-1.

No

→ Repair the engine mechanical problem.

Perform NO START VERIFICATION - VER-1.

243

DRIVEABILITY - DIESEL

*ENGINE WILL NOT CRANK —

Continued