Toyota Tundra (2015 year). Manual — part 1234

3. Reference waveforms showing an engine stop after normal idling

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

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

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

INSPECTION PROCEDURE

HINT:

In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to
determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions
problems such as starting difficulty.

If any other DTCs are output, perform troubleshooting for those DTCs first.
When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

occurs. This information can be useful when troubleshooting.

.

(a) Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction

conditions are unknown.

(1) The engine speed recorded in the freeze frame data is 0 rpm (the engine does not crank).

HINT:

If the battery voltage is less than 6 V during cranking, there is a high probability that engine friction

is abnormal.

If the battery voltage drops to 5 V or less when starting the engine, the battery may be

malfunctioning.

If the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being

performed. When the engine speed is 0 rpm, the crankshaft position sensor and/or an ECM may be

malfunctioning.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...