Chrysler PT Cruiser. Manual — part 365
Symptom:
*ENGINE CRANKS DOES NOT START - 2.0L/2.4L
POSSIBLE CAUSES
NO START PRE-TEST
POWERTRAIN FUSES OPEN
FUEL PRESSURE OUT OF SPECS
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
FUEL PUMP RELAY FUSED B+ CIRCUIT
FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
FUEL PUMP RELAY
FUEL PUMP GROUND CIRCUIT OPEN/HIGH RESISTANCE
FUEL PUMP MODULE
5 VOLT SUPPLY CIRCUIT
CKP SENSOR SIGNAL CIRCUIT OPEN
CKP SENSOR SIGNAL CIRCUIT SHORTED GROUND
CKP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
CKP SENSOR SIGNAL SHORTED TO 5 VOLT SUPPLY CIRCUIT
SENSOR GROUND CIRCUIT OPEN
ASD RELAY OUTPUT CIRCUIT
CRANKSHAFT POSITION SENSOR
IGNITION COIL
IGNITION COIL DRIVER CIRCUIT OPEN
IGNITION COIL DRIVER CIRCUIT SHORTED TO GROUND
PCM - COIL
PCM - CKP SENSOR SIGNAL
OTHER POSSIBLE CAUSES FOR NO START
550
STARTING
TEST
ACTION
APPLICABILITY
1
Note: The following list of items must be checked before continuing with
any no start tests.
The battery must be fully charged and in good condition. A low charged battery may
produce invalid test results. If the battery is low, charge the battery and then attempt
to start the vehicle by cranking the engine for 15 seconds, 3 consecutive times.
This will allow any DTC’s to set that may have been erased due to a dead battery.
Ensure the Powers and Ground to the PCM are ok.
Make sure the PCM communicates with the DRBIII
t and that there are no DTC’s
stored in the PCM memory. If the PCM reports a No Response condition, refer to the
Communication category for the proper tests.
Read the PCM DTC’s with the DRBIII
t. If any DTC’s are present, they must be
repaired before continuing with any other No Start diagnostic tests. Refer to the
Symptom list for the related P-code that is reported by the PCM.
Ensure that the PCI bus is functional. Attempt to communicate with the Instrument
Cluster and SKIM, If you are unable to establish communicate refer to the
Communication category for the proper symptoms.
The Sentry Key Immobilizer System must be operating properly. Check for proper
communication with the DRBIII
t and check for DTC’s that may be stored in the
Sentry Key Immobilizer Module (SKIM). repair the DTC(s) before continuing.
If no DTC’s are found, using the DRBIII
t select Clear PCM (Batt Disconnect).
Crank the engine several times. Using the DRBIII
t, read DTC’s. If a DTC is present
perform the DTC diagnostics before continuing.
Were any problems found?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Go To 2
2
Check for any open fuses in the PDC or Fuse Block that may be related to the No
Start condition.
Are any of the fuses open?
All
Yes
→ Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors, repair as necessary. Replace the Fuse.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test.
Note: It may be necessary to use a mechanics stethoscope in the next step.
Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?
All
Yes
→ Go To 4
No
→ Go To 24
Caution: Stop All Actuations.
551
STARTING
*ENGINE CRANKS DOES NOT START - 2.0L/2.4L —
Continued
TEST
ACTION
APPLICABILITY
4
NOTE: Repeat the following test at each Ignition wire. If spark is not
present or is weak on only one or two Ignition wires, the problem may be
the Ignition wire. Inspect all Ignition wires for proper operation.
Turn the ignition off.
Disconnect the #1 Ignition wire.
Connect a spark plug tester to the end of the Ignition wire.
While cranking the engine, observe the spark tester.
Is spark present?
All
Yes
→ Go To 5
No
→ Go To 9
5
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Install a fuel pressure gauge.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 kPa +/- 34 kPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
All
Below Specification
Within Specification
Above Specification
Replace the fuel filter/fuel pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
Caution: Stop All Actuations.
6
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special 5/16 fuel line adapter tool #6539 between the disconnected fuel line
and the fuel pump module.
Attach a fuel pressure test gauge to the T fitting on the tool #6539
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Is the fuel pressure within specification now?
All
Yes
→ Repair/replace fuel supply line as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Go To 7
Caution: Stop All Actuations.
552
STARTING
*ENGINE CRANKS DOES NOT START - 2.0L/2.4L —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose,fitting or line,
the fuel system pressure must be released.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
All
Yes
→ Replace the Fuel Pump Inlet Strainer.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Replace the Fuel Pump Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
8
The following items need to be checked as a possible cause for a no start condition.
Refer to any Technical Service Bulletins that may apply to the symptom.
The spark plugs must be free from fuel, oil, coolant and/or any foreign material or
deposits.
The fuel must be free from contamination.
The exhaust may be free from restrictions.
The engine compression must be within specifications.
The engine valve timing must be within specifications.
The engine must be free from vacuum leaks.
Were any of the above conditions found?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Test Complete.
9
Turn the ignition on.
With the DRBIII
t in Sensors, select the RPM parameter.
While cranking the engine monitor the RPM parameter.
Does the DRBIII
t display a RPM reading greater than 50 RPM and steady?
All
Yes
→ Go To 10
No
→ Go To 15
10
Turn the ignition off.
Disconnect the Ignition Coil harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the ASD Relay Output circuit in
the Ignition Coil harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 11
No
→ Repair the ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
11
Turn the ignition off.
Disconnect the Ignition Coil harness connector.
Using a 12-volt test light connected to 12-volts, probe the Ignition Coil Driver circuit.
Crank the engine for 5 second while observing the test light.
Does the test light blink/flicker?
All
Yes
→ Replace the Ignition Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 1 - NGC.
No
→ Go To 12
553
STARTING
*ENGINE CRANKS DOES NOT START - 2.0L/2.4L —
Continued
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