Dodge Caliber. Manual — part 748
16.
(K18) COIL 3 CONTROL CIRCUIT
Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) harness connector.
Check the (K18) Coil 3 Control circuit for an open circuit, short to
ground, and short to voltage.
Were any problems found?
Yes
>> Repair the (K18) Coil 3 Control circuit.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 17
17.
POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3, the
Ignition Coil 3, and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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P0304-CYLINDER 4 MISFIRE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Any time the engine is running, and the adaptive numerator has been successfully updated.
•
Set Condition:
When more than 1% misfire rate is measured during two trips. Three good trips to clear the MIL.
Possible Causes
INTERMITTENT DTC
(K343) FUSED MAIN RELAY OUTPUT CIRCUIT
(K344) FUSED MAIN RELAY OUTPUT CIRCUIT
(K14) INJECTOR 4 CONTROL CIRCUIT
(K15) COIL 4 CONTROL CIRCUIT
IGNITION WIRE
SPARK PLUG
FUEL PUMP INLET STRAINER PLUGGED
FUEL SUPPLY LINE RESTRICTED
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR 4
IGNITION COIL 4
FUEL PUMP MODULE
INTERNAL ENGINE COMPONENT
POWERTRAIN CONTROL MODULE (PCM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
DTC IS ACTIVE
Start the engine and allow it to reach operating temperature.
With the scan tool, monitor the View DTC screen.
Is the status Active for this DTC?
Yes
>> Go to 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
VISUAL INSPECTION
NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC to set.
Visually inspect the engine for any of the following conditions:
- Worn serpentine belt
- Binding engine driven accessories: A/C compressor, P/S pump, water pump.
- Misalignment of the Water pump, P/S pump or A/C compressor pulleys
- Corroded PCM power or ground circuits.
- Improper CKP, CMP, MAP, or TP Sensor mounting.
- Poor connector/terminal to component connection for CKP, CMP, MAP, or TP sensor, fuel injector, ignition coil, etc.
- Vacuum leaks.
- Restriction in the air induction or exhaust system.
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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- Internal engine component malfunction.
Were any of the above conditions present?
Yes
>> Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 3
3.
(K343) FUSED MAIN RELAY OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the Fuel Injector 4 connector.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (K343) Fused
Main Relay Output circuit in the Fuel Injector 4 harness connector.
NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.
Is the test light illuminated and bright?
Yes
>> Go to 4
No
>> Repair the (K343) Fused Main Relay Output circuit for high
resistance or a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
(K344) FUSED MAIN RELAY OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the Ignition Coil 4 connector.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (K344) Fused
Main Relay Output circuit in the Ignition Coil 4 harness connector.
NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.
Is the test light illuminated and bright?
Yes
>> Go to 5
No
>> Repair the (K344) Fused Main Relay Output circuit for high
resistance or a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
5.
IGNITION SYSTEM OPERATION
Turn the ignition off.
Remove the Ignition Coil 4.
Connect the Ignition Coil 4 harness connector.
NOTE: Leave the Fuel Injector 4 harness connector disconnected.
Install a spark tester on the Ignition Coil 4.
While cranking the engine, observe the spark coming from the spark tester.
NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated.
Is good spark present?
Yes
>> Go to 6
No
>> Go to 15
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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NOTE: Connect the Fuel Injector 4 harness connector before continuing.
6.
SPARK PLUG
Turn the ignition off.
Remove the spark plug.
Inspect the spark plug for the following conditions:
- Cracks
- Carbon tracking
- Foreign material
- Spark plug gap out of specifications
- Loose or broken electrode
NOTE: To check the electrode, lightly tap the bottom of the spark plug on a solid surface. The electrode
should not move.
Were any problems found?
Yes
>> Replace the spark plug.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 7
7.
FUEL PRESSURE OUT OF SPECIFICATION
NOTE: Before continuing, install any components that were removed for testing, and connect all harness
connectors.
WARNING: The fuel system is under a constant pressure, even with the engine off. Before testing or ser-
vicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow
these instructions can result in personal injury or death.
Turn the ignition off.
Install a fuel pressure gauge to the fuel rail.
Start the engine and observe the fuel pressure reading.
NOTE: The fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi).
Select the conclusion that best matches the fuel pressure reading:
Within Specification
Go to 8
Below Specification
Go to 13
Above Specification
Replace the fuel filter/pressure regulator.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
8.
FUEL INJECTOR LEAK DOWN
WARNING: The fuel system is under a constant pressure, even with the engine off. Before testing or ser-
vicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow
these instructions can result in personal injury or death
NOTE: Before continuing, inspect the fuel delivery system for external leaks or damage. Repair or replace
any leaking parts in accordance with the Service Information.
Turn the ignition off.
Install special tool #6539 (5/16
9
) or #6631 (3/8
9
) fuel line adapter.
Install the fuel pressure gauge.
Start the engine and allow the fuel system to reach maximum pressure.
Turn the ignition off.
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