Chrysler Town, Dodge Caravan. Manual — part 1172

Symptom:

*ENGINE CRANKS BUT WILL NOT START

POSSIBLE CAUSES

CAMSHAFT POSITION SENSOR SIGNAL PROBLEM

CRANKSHAFT POSITION SENSOR SIGNAL PROBLEM

ECM CODES PRESENT

ECT SENSOR

ENGINE CONTROL MODULE

ENGINE DRIVE BELT

FUEL INJECTOR DRIVER CIRCUIT(S) SHORTED TO GROUND

FUEL PRESSURE SENSOR

FUEL PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

FUEL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

FUEL SUPPLY CONTAMINATION

FUEL SYSTEM PRESSURE MECHANICAL

FUEL SYSTEM RESTRICTION

GLOW PLUGS

SENSOR GROUND OPEN

SKIM CODES PRESENT

TEST

ACTION

APPLICABILITY

1

NOTE: The ECM must have proper power and ground connections for the
following tests to be valid. Refer to Checking the ECM Power and Grounds
in the symptom list.
Turn the ignition on.
With the DRBIII

t, read the ECM DTCs.

Does the DRBIII

t display any ECM DTCs?

All

Yes

→ Refer to symptom list for problems related to ECM DTC.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 2

2

Turn the ignition on.
With the DRBIII

t, read the SKIM DTCs.

Does the DRBIII

t display any SKIM DTCs?

All

Yes

→ Refer to symptom list for problems related to SKIM DTC.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 3

231

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

3

Refer to the Service Information to ensure the Engine Drive Belt is 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

→ Go To 4

4

Using a temperature probe, check the vehicle temperature near the ECT Sensor.
Turn the ignition on.
With the DRBIII

t in Sensors, read the ECT Sensor temperature.

Compare the temperature probe reading with the DRB reading.
Are the two readings within 10°C of each other?

All

Yes

→ Go To 5

No

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

5

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 6

No

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

6

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect all 4 Fuel Injector harness connectors.
Measure the resistance between Ground and each Fuel Injector Driver circuit at it’s
respective Fuel Injector harness connector.
Is the resistance below 1000 ohms for any of the measurements?

All

Yes

→ Repair the Fuel Injector Driver circuit(s) for a short to ground.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 7

7

Inspect the fuel system lines for restrictions, leaks or other problems.
Is there any evidence of problems?

All

Yes

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

No

→ Go To 8

232

DRIVEABILITY - DIESEL

*ENGINE CRANKS BUT WILL NOT START —

Continued

TEST

ACTION

APPLICABILITY

8

Turn the ignition off.
Using the DRB 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 DRB.
NOTE: Refer to Charts and Graphs to view a correct CMP Sensor signal.
Does the DRB display a steady clean CMP Signal pattern?

All

Yes

→ Go To 9

No

→ Perform Test for DTC P0340-Camshaft Position Sensor Circuit

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

9

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 each circuit?

All

Yes

→ Go To 10

No

→ Perform Test for DTC P0340-Crankshaft Position Sensor Circuit

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

10

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

All

Yes

→ Go To 11

No

→ Repair as necessary.

Perform NO START VERIFICATION - VER-1.

11

Refer to the Service Information and perform the fuel pressure test. Note the test
results.
Using the DRB, read the Fuel Pressure PSI and compare the two readings.
Are the two readings within 3450 kPa (500 PSI) of each other?

All

Yes

→ Go To 12

No

→ Go To 13

12

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

All

Yes

→ Check the fuel supply for contamination.

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.

233

DRIVEABILITY - DIESEL

*ENGINE CRANKS BUT WILL NOT START —

Continued

TEST

ACTION

APPLICABILITY

13

Turn the ignition off.
Disconnect the Fuel Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Fuel Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 14

No

→ Repair the Fuel Pressure Sensor Signal circuit for an open.

Perform NO START VERIFICATION - VER-1.

14

Turn the ignition off.
Disconnect the Fuel Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Fuel Pressure Sensor 5-volt Supply circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 15

No

→ Repair the Fuel Pressure Sensor 5-volt Supply circuit for an open.

Perform NO START VERIFICATION - VER-1.

15

Turn the ignition off.
Disconnect the Fuel Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Replace the Fuel Pressure Sensor in accordance with the Service

Information.
Perform NO START VERIFICATION - VER-1.

No

→ Repair the Sensor Ground circuit for an open.

Perform NO START VERIFICATION - VER-1.

234

DRIVEABILITY - DIESEL

*ENGINE CRANKS BUT WILL NOT START —

Continued