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Dodge Caliber. Manual - part 747

NOTE: Connect the Fuel Injector 3 harness connector before continuing.

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)

>> Go to 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)

FUEL INJECTOR LEAK DOWN

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

) or #6631 (3/8

) fuel line adapter.

Install the fuel pressure gauge.

Start the engine and allow the fuel system to reach maximum pressure.

Turn the ignition off.

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

9 - 275

NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi).
Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the
engine.

Monitor the fuel pressure gauge for a minimum of 5 minutes.

NOTE: The pressure should not drop below 241 KPa (35 psi).

Does the pressure drop below the listed specification?

Yes

>> Replace the leaking fuel injector(s).

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

>> Go to 9

FUEL INJECTOR OPERATION

CAUTION: After each fuel injector actuation, start the engine to clear the cylinder of fuel. Failure to do so
could cause engine damage.
Remove special tool #C4390.

Start the engine and allow the fuel pressure to reach maximum pressure.

Ignition on, engine not running.

Using the scan tool, actuate the Fuel Injector 3 control.

Monitor the fuel pressure gauge.

Does the fuel pressure drop after the injector is actuated?

Yes

>> Go to 10

>> Go to 11

NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.

10.

INTERNAL ENGINE COMPONENT

Check for any of the following conditions/mechanical problems.

ENGINE VACUUM - must be at least 13 inches in neutral

ENGINE VALVE TIMING - must be within specifications

ENGINE COMPRESSION - must be within specifications

ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.

ENGINE PCV SYSTEM - must flow freely

TORQUE CONVERTER STALL SPEED - must be within specifications

POWER BRAKE BOOSTER - no internal vacuum leaks

FUEL - must be free of contamination

CAM LOBES - must not be worn excessively

CYLINDER LEAKAGE TEST - must be within specifications

VALVE SPRINGS - must not be weak or broken

Were any problems found?

Yes

>> Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

>> Go to 17

9 - 276

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

11.

FUEL INJECTOR 3

Turn the ignition off.

Disconnect the Fuel Injector 3 harness connector.

Turn the ignition on.

With the scan tool, clear DTCs.

With the scan tool, actuate the Fuel Injector 3 control.

Using a 12 volt test light connected to 12 volts check the (K13) Injector
3 Control circuit in the Fuel Injector 3 harness connector.

NOTE: The test light should blink each time the circuit is activated
by the PCM.

Does the test light blink each time the circuit is activated by
the PCM?

Yes

>> Replace the Fuel Injector 3 in accordance with the Service

Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

>> Go to 12

12.

(K13) INJECTOR 3 CONTROL CIRCUIT

Turn the ignition off.

Disconnect the Powertrain Control Module (PCM) connector.

Check the (K13) Injector 3 Control circuit for an open circuit, short to
ground, and short to voltage.

Were any problems found?

Yes

>> Repair the (K13) Injector 3 Control circuit for high resistance

or a shorted condition.

Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)

>> Go to 17

13.

FUEL SUPPLY LINE RESTRICTED

Turn the ignition off.

Install special tool #6539 (for 5/16) or #6631 (for 3/8) fuel line adapter and the fuel pressure gauge between the fuel
supply line and the fuel pump module.

Turn the ignition on.

With the scan tool, actuate the fuel pump to ON (100%) and observe the fuel pressure gauge.

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

9 - 277

NOTE: Fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi).

NOTE: If the PCM detects a low fuel level, the fuel pump actuation will not be allowed.

Is the fuel pressure within specification?

Yes

>> Repair or replace fuel supply line as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

>> Go to 14

14.

FUEL PUMP INLET STRAINER

Turn the ignition off.

Is the fuel inlet strainer plugged?

Yes

>> Replace the fuel pump inlet strainer.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

>> Before continuing, check the fuel pump module harness connector terminals for corrosion, damage, or

terminal push out. Make sure the ground circuit is functional. If any problems are found, repair as nec-
essary. Otherwise, replace the fuel pump module in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

15.

IGNITION COIL 3

WARNING: When the engine is operating, do not stand in direct
line with the fan. Do not put your hands near the pulleys, belts, or
fan. Do not wear loose clothing. Failure to follow these instruc-
tions can result in personal injury or death.
Turn the ignition off.

Disconnect the Ignition Coil 3 harness connector.

Remove the Fuel Pump Relay.

Using a 12 volt test light connected to 12 volts, check the (K18) Coil 3
Control circuit in the Ignition Coil 3 harness connector.

Crank the engine for 5 seconds.

NOTE: The test light should blink each time the circuit is activated
by the PCM.

Does the test light blink each time the circuit is activated by
the PCM?

Yes

>> Replace the Ignition Coil 3.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

>> Go to 16

9 - 278

ENGINE ELECTRICAL DIAGNOSTICS - GPEC

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