Dtc P1609 Air Fuel Ratio Too Rich

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DESCRIPTION

INSPECTION PROCEDURE

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

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

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 PatternDTC Detection ConditionTrouble 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
ResultProceed to
P1609 is outputA
P1609 and other DTCs are outputB
  • 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 ()