DTC P1604: Startability Malfunction: Description

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1604	Either condition is met (1 trip detection logic): The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below). After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds.	Immobiliser system Engine assembly (excess friction, compression loss) Starter assembly Crankshaft position sensor Camshaft position sensor Engine coolant temperature sensor Fuel pump Fuel pump control system Fuel pipes Fuel injector Throttle body Pressure regulator Battery Drive plate1 Flywheel2 Spark plug Ignition coil circuit Intake system Camshaft timing oil control valve (for intake or exhaust camshaft) Mass air flow meter Air fuel ratio sensor Valve timing Fuel Purge VSV Intake valve ECM

*1: for Automatic transaxle models
*2: for Manual transaxle models

Fig 1: Identifying Normal Cold Engine Start Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reference waveforms showing a normal cold engine start

Fig 2: View Of Waveforms Showing A Normal Cold Engine Start
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Reference waveforms showing a normal warm engine start

Fig 3: View Of Waveforms Showing A Normal Warm Engine Start
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reference values when there is an air leak in the intake system during starting difficulty

FREEZE FRAME DATA P1604 STARTABILITY MALFUNCTION

Engine
Current	P1604: Startability Malfunction
	Time Freeze Frame Data
	Item	Data1	Data2	Data3	Data4	Data5	Unit
	Engine Speed	1489	986	345	186	124	rpm
	Calculate Load	36.2	28.2	31.4	92.4	94.6	%
	Vehicle Load	7.9	7.9	9.2	7.2	6.0	%
	MAF	10.12	5.04	2.79	0.81	0.68	gm/s
	Atmosphere Pressure	-0	-0	-0	-0	-0	kPa
	Coolant Temp	85	85	85	85	85	°C
	Intake Air	39	39	39	39	39	°C
	Battery Voltage	13.222	13.300	12.109	11.972	11.854	V
	Throttle Sensor Volt %	16.5	16.5	16.0	15.6	15.6	%
	Throttl Sensor #2 Volt %	48.2	48.2	47.8	47.2	47.2	%
	Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
	Throttle Motor DUTY	16.5	16.5	16.0	15.6	15.6	%
	Injector (Port)	3628	2620	2744	2744	2744	μs
	Injection Volume (Cylinder 1)	3.062	0.226	0.226	0.226	0.226	ml
	Fuel Pump/Speed Status	ON	ON	ON	ON	ON
	EVAP (Purge) VSV	0.0	0.0	0.0	0.0	0.0	%
	Evap Purge Flow	0.0	0.0	0.0	0.0	0.0	%
	Purge Density Learn Value	0.000	0.000	0.000	0.000	0.000
	EVAP System Vent Valve	OFF	OFF	OFF	OFF	OFF
	EVAP Purge VSV	OFF	OFF	OFF	OFF	OFF
	Purge Cut VSV Duty	0.0	0.0	0.0	0.0	0.0	%
	Target Air-Fuel Ratio	0.998	0.998	0.998	0.998	0.998
	AF Lambda B1S1	0.999	0.999	0.999	0.999	0.999
	AFS Voltage B1S1	3.258	3.258	3.258	3.258	3.258	V
	O2S B1S2	0.000	0.000	0.000	0.000	0.000	V
	Short FT #1	0.000	0.000	0.000	0.000	0.000	%
	Long FT #1	8.782	4.354	-2.665	-2.665	-2.665	%
	Total FT #1	0.058	0.058	0.058	0.058	0.058
	Fuel System Status #1	OL	OL	OL	OL	OL
	IGN Advance	0.0	10.5	16.5	18.0	18.0	Deg
	Knock Feedback Value	-1.5	-1.5	-1.5	-1.5	-1.5	deg(CA)
	Knock Correct Learn Value	17.0	17.0	17.0	17.0	17.0	deg(CA)
	Starter Signal	Close	Close	Close	Close	Close
	Ambient Temperature	21	21	21	21	21	°C