DTC P1604: Startability Malfunction [12/2015 - 08/2016]: Description

WARNING: This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

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: The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below) (1 trip detection logic). After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds (1 trip detection logic).	Engine immobiliser system Engine assembly (excess friction, compression loss) Starter Crankshaft position sensor VVT sensor Engine coolant temperature sensor Fuel pump Fuel pump control system Fuel pipes Fuel injector assembly Throttle body with motor assembly Battery Drive plate Spark plug Ignition coil circuit Intake system Camshaft timing oil control valve assembly (for intake side of bank 1, 2) Camshaft timing oil control valve assembly (for exhaust side of bank 1, 2) Mass air flow meter Air fuel ratio sensor Valve timing Fuel Purge VSV Intake valve Exhaust valve ECM

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 STABILITY MALFUNCTION

Parameter	-3	-2	-1	0	1	Unit
Engine Speed	1625	1042	501	192	129	rpm
Calculate Load	43.1	30.5	38.8	93.3	93.3	%
Vehicle Load	9.0	16.0	28.2	34.1	29.8	%
MAF	6.01	6.67	5.64	2.62	1.54	gm/sec
Atmosphere Pressure	-1	-1	-1	-1	-1	psi(gauge)
Coolant Temp	180	180	180	180	180	F
Intake Air	122	120	118	118	118	F
Battery Voltage	12.460	12.519	12.187	12.128	12.050	V
Throttle Sensor Volt %	17.6	17.6	17.6	17.2	17.2	%
Throttle Sensor #2 Volt %	50.1	50.1	50.1	49.8	49.8	%
Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
Throttle Motor DUTY	17.6	17.6	17.6	17.2	17.2	%
Injector (Port)	3770	2465	2907	3245	7608	μs
Injection Volum (Cylinder1)	0.000	0.199	0.199	0.199	0.199	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 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	0.889	0.913	0.920	0.925	0.833
AF Lambda B1S1	0.998	0.998	0.998	0.998	0.998
AF Lambda B2S1	0.998	0.998	0.998	0.998	0.998
AFS Voltage B1S1	3.298	3.298	3.298	3.298	3.298	V
AFS Voltage B2S1	3.298	3.298	3.298	3.298	3.298	V
O2S B1S2	0.000	0.000	0.000	0.000	0.000	V
O2S B2S2	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	0.000	0.000	0.000	-0.782	0.000	%
Total FT #1	0.000	0.000	0.000	0.000	0.000
Short FT #2	0.000	0.000	0.000	0.000	0.000	%
Long FT #2	1.562	0.781	0.781	0.781	0.781	%
Total FT #2	0.000	0.000	0.000	0.000	0.000
Fuel System Status #1	OLFault	OL	OL	OL	OL
Fuel System Status #2	OLFault	OL	OL	OL	OL
IGN Advance	0.0	17.5	13.5	0.0	0.0	deg
Knock Feedback Value	-3.0	-3.0	-3.0	-3.0	-3.0	deg(CA)
Knock Correct Learn Value	23.1	23.1	23.1	23.1	23.1	deg(CA)
VVT Control Status #1	OFF	OFF	OFF	OFF	OFF
VVT Control Status #2	OFF	OFF	OFF	OFF	OFF
Starter Signal	OFF	OFF	OFF	OFF	OFF