No.10 Low Idle/Stalls During Deceleration: Notes

DESCRIPTION & POSSIBLE CAUSE

10	LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION	Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE	PCM DTC is stored Erratic signal to PCM APP sensor or related circuit malfunction Brake switch or related circuit malfunction CPP switch or related circuit malfunction (MTX) Neutral switch or related circuit malfunction (MTX) Communication error between TCM and PCM (ATX) ECT sensor No.1 or related circuit malfunction MAF sensor or related circuit malfunction MAP sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction TP sensor or related circuit malfunction Generator malfunction (part, system, control malfunction) Amount of generator voltage is large Improper air/fuel mixture ratio control Improper operation of A/C magnetic clutch Improper operation of drive-by-wire control system Incorrect fuel injection timing Fuel injector malfunction Purge solenoid valve malfunction Poor fuel quality Air leakage from intake-air system Intake-air system restriction Fuel leakage Vacuum leakage Engine mount installation loose Erratic signal from intake CMP sensor Loose installation Damaged trigger wheel (intake camshaft and/or exhaust camshaft) Open or short circuit in related wiring harness Erratic signal from CKP sensor Loose installation Damaged trigger wheel (crankshaft pulley) Open or short circuit in related wiring harness Inadequate fuel pressure (high or low pressure side) Fuel pressure sensor or related circuit malfunction High pressure fuel pump malfunction Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system) Spill valve control solenoid valve (built-into high pressure fuel pump) malfunction Relief valve (built-into high pressure fuel pump) malfunction Fuel line restriction Fuel filter clogged Fuel pump unit malfunction Low engine compression Improper intake valve timing Improper exhaust valve timing Injector driver (built-into PCM) 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 injury 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 ). (See AFTER SERVICE PRECAUTION ). CAUTION: Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

RELATED PIDs DESCRIPTION

Monitor item (Definition)	Unit/Condition	Condition/Specification (Reference)
APP1	%	Accelerator pedal released: approx. 16 % Accelerator pedal depressed: approx. 80 %
APP1	V	Accelerator pedal released: approx. 0.8 V Accelerator pedal depressed: approx. 4 V
APP2	%	Accelerator pedal released: approx. 8 % Accelerator pedal depressed: approx. 40 %
APP2	V	Accelerator pedal released: approx. 0.4 V Accelerator pedal depressed: approx. 2 V
BOO	OFF/ON	Brake pedal released: Off Brake pedal depressed: On
CPP (MTX)	OFF/ON	Clutch pedal depressed: On Clutch pedal released: Off
CPP/PNP (MTX)	OFF/ON	Neutral: On Other than neutral: Off
ECT	°C, °F	Displays the ECT
ECT	V	ECT is 20°C {68°F}: approx. 3.10 V ECT is 40°C {104°F}: approx. 2.16 V ECT is 60°C {140°F}: approx. 1.40 V ECT is 80°C {176°F}: approx. 0.87 V ECT is 100°C {212°F}: approx. 0.54 V
MAF	g/sec	Displays the MAF
MAF	V	Switch the ignition to ON (MAF: 0.59 g/s {0.078 lb/min}): approx. 0.72 V Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): approx. 0.86 V Racing (engine speed is 2,000 rpm ) (MAF: 4.73 g/s {0.626 lb/min}): approx. 1.07 V
MAP	KPa {MPa}, mBar {Bar}, psi, in H20	Displays the MAP
MAP	V	Switch the ignition to ON (MAP: 101 kPa {1.03 kgf/cm ² , 14.6 psi}): approx. 4.07 V Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm ² , 4.8 psi}): approx. 1.34 V Racing (engine speed is 2,000 rpm ) (MAP: 26 kPa {0.27 kgf/cm ² ,3.8 psi}): approx. 1.05 V
TPREL	%	Accelerator pedal released: approx. 12 % Accelerator pedal depressed: approx. 82 %
VSS	KPH, MPH	Displays the vehicle speed
RPM	RPM	Displays the engine speed
O2S11	A	Idle (after warm up): approx. -39 μA Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): approx. 3.84 mA
O2S12	V	Idle (after warm up): 0-1.0 V Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): approx. 0 V
SHRTFT1	%	Idle (after warm up): approx. 1.56 % Racing (engine speed is 2,000 rpm ): approx. -3.12 % Racing (engine speed is 4,000 rpm ): approx. -8.59 %
LONGFT1	%	Idle (after warm up): approx. -2.34 % Racing (engine speed is 2,000 rpm ): approx. -0.78 % Racing (engine speed is 4,000 rpm ): approx. -0.78 %
ALTF	%	Switch the ignition to ON: 0 % Idle: approx. 42 % Racing (engine speed is 2,000 rpm ): approx. 29 %
ALTT V	V	Idle (no E/L): approx. 14 V (this is an internal calculation value and differs from the terminal voltage).
AC_REQ	OFF/ON	A/C switch OFF: Off A/C switch ON: On
FUEL_PRES	KPa {MPa}, mBar {Bar}, psi, in H20	Displays the fuel pressure
FUEL_PRES	V	Fuel pressure is 3.0 MPa {31 kgf/cm ² , 435 psi}: approx. 0.92 V Fuel pressure is 4.8 MPa {49 kgf/cm ² , 696 psi}: approx. 1.17 V
LOAD	%	Idle (after warm up): approx. 16.07 % Racing (engine speed is 2,000 rpm ): approx. 14.51 % Racing (engine speed is 4,000 rpm ): approx. 21.17 %