Toyota Tundra (2015 year). Manual — part 1985
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
occurs. This information can be useful when troubleshooting.
.
using freeze frame data.
When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce
malfunctions that do not always occur.
If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is
not necessary to repeat the procedure the second time.
1. Malfunction Recurrence and Inspection Areas
(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.
(2) All engine speeds recorded in the freeze frame data are between 100 and 250 rpm (the engine cranks but
there is no combustion).
HINT:
If the engine speed is between 100 and 250 rpm (no initial combustion), there may be a wiring problem or a
or low and the engine may not be able to be started.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...
(3) The engine speed recorded in the freeze frame data is 250 rpm or higher (the initial combustion and starter
turnoff timing is too late).
HINT:
If the engine speed is 250 rpm or higher (combustion occurs but the initial combustion and starter turnoff timing is
or low and engine starting trouble may occur.
If Long FT is incorrect, there may be a fuel supply problem due to the injectors or fuel pump being
clogged, etc.
If the engine cranking speed is too high, compression loss may have occurred due to carbon
interfering with the valve operation.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...
(b) When the malfunction (starting difficulty) can be reproduced, or malfunction conditions are known, perform the
following inspections ("Problem symptoms" and "Systems to inspect")
(1) Problem symptoms
The engine does not crank.
HINT:
The starter is normal if a noise that indicates the starter pinion gear is extending is heard. The
battery may be fully depleted or there may be excess engine friction.
1.
The engine cranking speed is abnormal.
HINT:
If the engine cranking speed is too high (for example, 300 rpm or higher with no combustion),
compression loss may have occurred because carbon interfered with valve operation, etc.
2.
There is no initial combustion.
HINT:
If there is no initial combustion, there is probably a wiring problem or an ignition or fuel
system part malfunction.
3.
The engine stalls after starter turnoff.
HINT:
If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the VVT may
have a problem returning.
4.
The initial combustion and starter turnoff occur late.
HINT:
If the initial combustion and starter turnoff occur late, the fuel injection volume is probably
incorrect (too low or too high).
HINT:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст