2000 TOYOTA CAMRY Service Repair Manual

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Page 2689 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (1MZ±FE)
DI±269
504 Author: Date:
4 Check for spark and ignition (See page IG±1).
NG Repair or replace.
OK
5 Check fuel pressure (See page SF±21).
NG Check and repair fuel p

Page 2690 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DI±270
± DIAGNOSTICSENGINE (1MZ±FE)
505 Author: Date:
7 Check the output voltage A/F sensors (bank1, 2 sensor1).
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand±held tester to the D

Page 2691 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (1MZ±FE)
DI±271
506 Author: Date:
8 Check for open and short in harness and connector between ECM and A/F sen-
sors (bank1, 2 sensor1) (See page IN±31).
NG Repair or replace

Page 2692 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DI±272
± DIAGNOSTICSENGINE (1MZ±FE)
507 Author: Date:
DTC P0171 System too Lean (Fuel Trim)
(Except California Spec.)
DTC P0172 System too Rich (Fuel Trim)
(Except California Spec.)
CIRCUIT DESCR

DI±272
± DIAGNOSTICSENGINE (1MZ±FE)
507 Author: Date:
DTC P0171 System too Lean (Fuel Trim)
(Except California Spec.)
DTC P0172 System too Rich (Fuel Trim)
(Except California Spec.)
CIRCUIT DESCRIPTION
Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short±term fuel trim and long±term fuel trim.
Short±term fuel trim is the short±term fuel compensation used to maintain the air±fuel ratio at its ideal
theoretical value. The signal from the heated oxygen sensor indicates whether the air±fuel ratio is RICH or
LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air±fuel ratio is rich,
and an increase in fuel volume if it is lean.
Long±term fuel trim is overall fuel compensation carried out long±term to compensate for continual deviation
of the short±term fuel trim from the central value due to individual engine differences, wear over time and
changes in the usage environment.
If both the short±term fuel trim and long±term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction and the MIL lights up.
DTC No.DTC Detecting ConditionTrouble Area
P0171
When air fuel ratio feedback is stable after engine warming up,
fuel trim is considerably in error on RICH side
(2 trip detection logic)
Air intake (hose loose)
Fuel line pressure
Injector blockage
Heated oxygen sensors (bank 1, 2 sensor 1) malfunction
Mass air flow meter
Engine coolant temp. sensor
Gas leakage on exhaust system
P0172
When air fuel ratio feedback is stable after engine warming up,
fuel trim is considerably in error on LEAN side
(2 trip detection logic)
Fuel line pressure
Injector leak, blockage
Heated oxygen sensors (bank 1, 2 sensor 1) malfunction
Mass air flow meter
Engine coolant temp. sensor
Gas leakage on exhaust system
HINT:
When DTC P0171 is recorded, the actual air±fuel ratio is on the LEAN side. When DTC P0172 is re-
corded, the actual air±fuel ratio is on the RICH side.
If the vehicle runs out of fuel, the air±fuel ratio is LEAN and DTC P0171 is recorded. The MIL then
comes on.
If the total of the short±term fuel trim value and long±term fuel trim value is within + 35 % (80°C (176°F)
or more), the system is functioning normally.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel ratio lean or rich, etc.
at the time of the malfunction.
DI4DR±01

Page 2693 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (1MZ±FE)
DI±273
508 Author: Date:
1 Check air induction system (See page SF±1).
NG Repair or replace.
OK
2 Check injector injection (See page SF±21).
NG Replace injector.
OK

Page 2694 of 4770

TOYOTA CAMRY 2000 Service Repair Manual P18349
DI±274
± DIAGNOSTICSENGINE (1MZ±FE)
509 Author: Date:
6 Check gas leakage on exhaust system.
NG Repair or replace.
OK
7 Check the output voltage of heated oxygen sensors (bank1, 2 sensor1)

Page 2695 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (1MZ±FE)
DI±275
510 Author: Date:
8 Check for open and short in harness and connector between ECM and heated
oxygen sensors (bank1, 2 sensor1) (See page SF±71).
NG Repair or

Page 2696 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DI±276
± DIAGNOSTICSENGINE (1MZ±FE)
511 Author: Date:
DTC P0300 Random/Multiple Cylinder Misfire Detected
DTC P0301 Cylinder 1 Misfire Detected
DTC P0302 Cylinder 2 Misfire Detected
DTC P0303 Cyl

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