NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [AJ]


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 • Knock sensor and related circuit malfunction 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].) (See AFTER SERVICE PRECAUTION [AJ].)


STEP	INSPECTION		ACTION
1	• Connect the WDS or equivalent to the DLC-2. • Access ECT PID. • Verify ECT PID is below 116 ° C {241 ° F} during driving. • Is ECT PID below the specification?	Yes	Go to the next step.
1		No	Inspect the cooling system for cause of overheating.
2	• Connect the WDS or equivalent 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.
2		No	DTC is displayed: • Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J# 300001-301513).) (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A# 301514- (Assumed)).)
3	• Is the engine compression correct?	Yes	Go to the next step.
3	• Is the engine compression correct?	No	Inspect for cause.
4	• Install a fuel pressure gauge between the pulsation damper and the fuel distributor. • Start the engine and run it at idle. • Measure fuel line pressure at idle. • Is fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION [AJ].)	Yes	Go to the next step.
4		No	Zero or low: • Inspect the fuel pump circuit. • Inspect for open fuel pump relief valve. • Inspect for fuel leakage inside the pressure regulator. • Inspect for clogged main fuel line. High: • Inspect the pressure regulator for high pressure cause. • Inspect for clogged fuel return line.
5	• Inspect the knock sensor. (See KNOCK SENSOR INSPECTION [AJ] (VIN: JMZ LW19J7# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J# 300001-301513).) (See KNOCK SENSOR INSPECTION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A# 301514- (Assumed)).) • Is the knock sensor normal?	Yes	Inspect the ignition timing.
5		No	Replace the knock sensor.
6	• Verify test results. - If normal, return to 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 or reprogram the PCM.