Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip1133p
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DI-109
DIAGNOSTICS - ENGINE
DI4F7-02
DTC P1133 A/F Sensor Circuit Response Malfunction
(Bank 1 Sensor 1)
DTC P1153 A/F Sensor Circuit Response Malfunction
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-42 .
DTC No. DTC Detecting Condition Trouble Area
After engine is warmed up and during vehicle driving at
engine speed 1,400 rpm or more and vehicle speed 60
P1133
km/h (38 mph) or more, if response characteristic of A/F S A/F sensors (bank 1, 2 sensor 1)
P1155
sensor becomes deteriorated
(2 trip detection logic)
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.
1 Are there any other codes (besides DTC P1133, P1153) being output ?
YES Go to relevant DTC chart.
NO
2001 SIENNA (RM787U)
Author : Date : 263
DI-1 10
DIAGNOSTICS - ENGINE
2 Connect the OBDII scan tool or TOYOTA hand-held tester and read value for
voltage output of A/F sensors (bank1, 2 sensor1).
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Warm up the A/F sensors (bank1, 2 sensor1) with the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Read voltage of A/F sensors (bank 1, 2 sensor 1) on the screen of OBD II scan tool or TOYOTA hand-held
tester when you perform all the following conditions.
HINT:
The voltage of AFR and AFL terminals of ECM is fixed at 3.3 V and the voltage of AFR and AFL
terminals is fixed at 3.0 V. Therefore, it is impossible to check the A/F sensors (bank1, 2 sensor1) output
voltage at the terminals (AFR , AFL /AFR , AFL ) of ECM.
OK:
Condition A/F Sensor Voltage value
Engine idling
S Not remains at 3.30 V (*0.660 V)
Engine racing
S Not remains at 3.8 V (*0.76 V) or more
3 8 (*0 76
Driving at engine speed 1,500 rpm or more and vehicle S Not remains at 2.8 V (*0.56 V) or less
speed 40 km/h (25 mph) or more, and operate throttle *: When you use the OBD II scan tool (excluding TOYOTA hand-held tester)
valve open and close.
HINT:
S During fuel enrichment, there is a case that the output voltage of A/F sensors (bank1, 2 sensor1) is
below 2.8 V (* 0.56 V), it is normal.
S During fuel cut, there is a case that the output voltage of A/F sensors (bank1, 2 sensor1) is above 3.8
V (* 0.76 V), it is normal.
S If output voltage of A/F sensors (bank1, 2 sensor1) remains at 3.30 V (* 0.660 V) even after performing
all the above conditions, A/F sensors (bank1, 2 sensor1) circuit may be open.
S If output voltage of A/F sensors (bank1, 2 sensor1) remains at 3.8 V (* 0.76V) or more, or 2.8 V (*0.56
V) or less even after performing all the above conditions, A/F sensors (bank1, 2 sensor1) circuit may
be short.
*: When you use the OBD II scan tool (excluding TOYOTA hand-held tester).
OK Go to step 9.
NG
2001 SIENNA (RM787U)
Author : Date : 264
DI-1 11
DIAGNOSTICS - ENGINE
3 Check for open and short in harness and connector between ECM and A/F sen-
sors (bank 1, 2 sensor 1) (See page IN-31 ).
NG Repair or replace harness or connector.
OK
4 Check resistance of A/F sensor heater (See page SF-81 ).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF-1 ).
NG Repair or replace.
OK
6 Check fuel pressure (See page SF-6 ).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF-1 ).
OK
2001 SIENNA (RM787U)
Author : Date : 265
DI-1 12
DIAGNOSTICS - ENGINE
7 Check injector injection (See page SF-26 ).
NG Replace injector.
OK
Replace A/F sensors (bank1, 2 sensor1).
8 Perform confirmation driving pattern (See page DI-104 ).
Go
9 Are there DTC P1133 and/or P1153 being output again ?
YES Check and replace ECM
(See page DI-3 ).
NO
10 Did vehicle runs out of fuel in the past ?
NO Check for intermittent problems
(See page DI-3 ).
YES
DTC P1133 and /or P1153 is caused by running out of fuel.
2001 SIENNA (RM787U)
Author : Date : 266
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