Jeep Liberty KJ. Manual - part 518

(K58) INJECTOR CONTROL NO.6 CIRCUIT OPEN

Turn the ignition off.

Disconnect the C2 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
Measure the resistance of the (K58) Injector Control No.6 circuit from
the Fuel Injector harness connector to the appropriate terminal of spe-
cial tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 6

>> Repair the open in the (K58) Injector Control No.6 circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)

PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.

Were there any problems found?

Yes

>> Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

>> Replace and program the Powertrain Control Module per Service Information.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE ELECTRICAL DIAGNOSTICS

P0300-MULTIPLE CYLINDER 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:
The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to
increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM.
It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Possible Causes

(F142) AND (A142) ASD RELAY OUTPUT CIRCUITS

INJECTOR CONTROL CIRCUIT

COIL CONTROL CIRCUIT

IGNITION WIRE

SPARK PLUG

IGNITION COIL

FUEL PUMP INLET STRAINER PLUGGED

RESTRICTED FUEL SUPPLY LINE

FUEL PUMP MODULE

FUEL PRESSURE LEAK DOWN

FUEL INJECTOR

ENGINE MECHANICAL PROBLEM

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Diagnostic Test

CYLINDER MIS-FIRE CONDITION ACTIVE

NOTE: Check for any TSB’s that apply to a Misfire condition. Review the vehicle repair history for any mis-
fire condition repairs that have been performed.
Star the engine.

Observe the WHICH CYLINDER IS MISFIRING screen for at least one minute on the scan tool.

Is there a misfire present?

Yes

>> Go To 2

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

VISUAL INSPECTION

NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC.

NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector
Control circuit.
- 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 Water pump, P/S Pump and A/C Compressor pulleys

- Corroded PCM power and ground circuits.

- Improper CKP, CMP, MAP, and TP Sensor mounting

ENGINE ELECTRICAL DIAGNOSTICS

9 - 231

- Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ign coil, etc.

- Vacuum leaks

- Restricted Air Induction system or Exhaust system.

- Internal engine component failures.

Were any of the above conditions present?

Yes

>> Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

>> Go To 3

(A142) AND (F142) ASD RELAY OUTPUT CIRCUIT

Turn the ignition off.

Disconnect the Ignition Coil harness connector of the misfiring cylinders.

Disconnect the Fuel Injector harness connector of the misfiring cylinders.

Ignition on, engine not running.

With a scan tool, actuate the ASD Relay.

Using a 12-volt test light connected to ground, probe the (A142) ASD Relay Output circuit in the Ignition Coil har-
ness connector and the (F142) ASD Relay Output circuit in the Fuel Injector harness connector, while the relay is
actuating.

Does the test light illuminate brightly?

Yes

>> Go To 4

>> Repair the excessive resistance or short to ground in the (A142) or (F142) ASD Relay Output circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

IGNITION SYSTEM OPERATION

Turn the ignition off.

Connect the Ignition Coil harness connectors.

Remove the Ignition Coils.

Leave the Fuel Injector harness connector of the cylinder being tested disconnected.

Install a spark tester on the Ignition Coil.

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 5

>> Go To 14

NOTE: Connect the Fuel Injector 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

- Gap size out of specifications

- Loose or broke electrode

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ENGINE ELECTRICAL DIAGNOSTICS

NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should
not move.

Does the Spark Plug have any problems?

Yes

>> Replace the Spark Plug.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

>> Go To 6

FUEL PRESSURE CHECK

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.
Install a fuel pressure gauge to the fuel rail.

Start the engine and observe the fuel pressure reading.

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

Choose a conclusion that best matches your fuel pressure reading.

Within Specification

Go To 7

Below Specification

Go To 12

Above Specification

Replace the fuel filter/pressure regulator.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

FUEL PRESSURE LEAK DOWN

NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or dam-
age. Repair /replace as necessary.
Turn the ignition off.

) 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.

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 fall below 241 KPa (35 psi)

Does the gauge fall below the listed specification?

Yes

>> Replace the leaking Fuel Injector(s).

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

>> Go To 8

ENGINE ELECTRICAL DIAGNOSTICS

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