DTC P1609 Air Fuel Ratio Too Rich

DESCRIPTION

This DTC is stored if the ECM detects that the air fuel ratio is too rich due to a malfunction in the fuel system, exhaust fuel addition injector system, mass air flow meter sub-assembly or manifold absolute pressure sensor.

Using the GTS, 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.

P1609
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
-	Both of the following conditions 1 and 2 are met for approximately 2 seconds: (1 trip detection logic) All of the following conditions are met: Engine not being started Air fuel ratio sensor is active (warmed up) Mass air flow meter sub-assembly is normal Manifold absolute pressure sensor is normal PM forced regeneration has not been performed Air fuel ratio sensor output value exceeds the threshold	Intake system clogged EGR valve stuck open Deterioration of mass air flow meter (out of range) Intake system hose disconnected or cracked Turbocharger sub-assembly vane stuck fully open Manifold absolute pressure sensor Atmospheric pressure sensor (built into ECM) Suction control valve sticking Fuel leak Excessive amount of engine oil Fuel pressure sensor (common rail assembly (for bank 1)) Engine coolant leak Radiator assembly clogged Engine coolant temperature sensor Engine coolant temperature sensor out of range or stuck Exhaust fuel addition injector assembly stuck open Air fuel ratio sensor circuit contact problem Fuel (cetane number, evaporation, etc.)

INSPECTION PROCEDURE

In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1609 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as black smoke or white smoke emitted.
As the DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC without performing any troubleshooting and return the vehicle to the customer.

If any other DTCs are output, perform troubleshooting for those DTCs first.

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data.

Dtc P1609 Air Fuel Ratio Too Rich. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

The fourth set of freeze frame data is the data recorded when the DTC is stored.

1.READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA (PROCEDURE 1))

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Engine and ECT / Trouble Codes.

Record the stored DTC and freeze frame data.

HINT:

This freeze frame data shows the actual engine conditions when air fuel ratio being too rich occurred.

NEXT

2.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1609)

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Engine and ECT / Trouble Codes.

Read the DTCs.

Result
Result	Proceed to
P1609 is output	A
P1609 and other DTCs are output	B

HINT:

If any DTCs other than DTC P1609 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART ()

A

GO TO BLACK SMOKE EMITTED ()

1VD-FTV ENGINE CONTROL

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

ECD SYSTEM w/ DPF