NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE[AJ (3.0L Duratec)]

• The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

― Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

― Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual.

(See BEFORE SERVICE PRECAUTION[AJ (3.0L Duratec)].)

(See AFTER SERVICE PRECAUTION[AJ (3.0L Duratec)].)

STEP	INSPECTION	RESULTS	ACTION
1	• Connect the M-MDS to the DLC–2. • Access the ECT PID. • Verify ECT PID is below 116 °C {241 °F} during driving. • Is the ECT PID below specification?	Yes	Go to the next step.
No	Inspect the cooling system for cause of overheating.
2	• Connect the M-MDS to the DLC–2. • Turn the ignition switch to the ON position (Engine off). • Retrieve any DTCs. • Is “PASSED” displayed?	Yes	No DTC is displayed: • Go to the next step.
No	DTC is displayed: • Go to the appropriate DTC test.
3	• Is the engine compression correct?	Yes	Go to the next step.
No	Inspect for cause.
4	• Install fuel pressure gauge to the fuel line. • Start the engine and run it at idle. • Measure the fuel line pressure at idle. • Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION[AJ (3.0L Duratec)].)	Yes	Go to the next step.
No	Zero or low: High: Inspect the fuel pump and fuel pump relay related circuit. Inspect the clogged fuel line. • If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION[AJ (3.0L Duratec)].) Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
5	• Verify the test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.

STEP

INSPECTION

RESULTS

ACTION

• Connect the M-MDS to the DLC–2.

• Access the ECT PID.

• Verify ECT PID is below 116 °C {241 °F} during driving.

• Is the ECT PID below specification?

Yes

Go to the next step.

Inspect the cooling system for cause of overheating.

• Connect the M-MDS to the DLC–2.

• Turn the ignition switch to the ON position (Engine off).

• Retrieve any DTCs.

• Is “PASSED” displayed?

Yes

No DTC is displayed:

• Go to the next step.

DTC is displayed:

• Go to the appropriate DTC test.

• Is the engine compression correct?

Yes

Go to the next step.

Inspect for cause.

• Install fuel pressure gauge to the fuel line.

• Start the engine and run it at idle.

• Measure the fuel line pressure at idle.

• Is the fuel line pressure correct at idle?

(See FUEL LINE PRESSURE INSPECTION[AJ (3.0L Duratec)].)

Yes

Go to the next step.

Zero or low: High:

Inspect the fuel pump and fuel pump relay related circuit.

Inspect the clogged fuel line.

• If normal, replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

• Verify the test results.

― If normal, return to the diagnostic index to service any additional symptoms.

― If malfunction remains, inspect related Service Information and perform repair or diagnosis.

• If vehicle is repaired, troubleshooting completed.

• If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.

13	Knocking/pinging—acceleration/cruise
DESCRIPTION	• Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g. hot spot in combustion chamber).
POSSIBLE CAUSE	• Engine overheating due to cooling system malfunction • ECT sensor malfunction • IAT sensor malfunction • Inadequate engine compression • Inadequate fuel pressure Warning • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: ― Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. ― Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION[AJ (3.0L Duratec)].) (See AFTER SERVICE PRECAUTION[AJ (3.0L Duratec)].)