Page 2577 of 4770

± DIAGNOSTICSENGINE (5S±FE)
DI±157
392 Author: Date:
DTC P1133 A/F Sensor Circuit Response Malfunction
(Only for California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
DTC No.DTC Detecting ConditionTrouble Area
P1133
After engine is warmed up, and during vehicle driving at en-
gine speed 1,600 rpm or more and vehicle speed 60 km/h (38
mph) or more, if response characteristic of A/F sensor be-
comes deteriorated
(2 trip detection logic)
A/F sensor
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) being output?
YES Go to relevant DTC chart.
NO
DI01E±06
Page 2578 of 4770

DI±158
± DIAGNOSTICSENGINE (5S±FE)
393 Author: Date:
2 Connect OBD II scan tool or TOYOTA nand±held teter, and read value for voltage
output of A/F sensor.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Warm up the A/F sensor with the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Read voltage value of the A/F sensor on the screen of OBD II scan tool or TOYOTA hand±held tester when
you perform all the following conditions.
HINT:
The voltage of AF terminal of ECM is 3.3 V fixed and AF terminal is 3.0 V fixed. Therefore, it is impossible
to check the A/F sensor output voltage at the terminals (AF/AF) of ECM.
OK:
ConditionA/F Sensor Voltage Value
Engine idling
Engine racingNot remains at 3.30 V (* 0.660 V)
Not remains at38V(*0 76 V) or moreDriving at engine speed 1,500 rpm or more and vehicle
speed 40 km/h (25 mph) or more, and operate throttle valve
open and closeNot remains at 3.8 V (* 0.76 V) or more
Not remains at 2.8 V (* 0.56 V) or less
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester)
HINT:
During fuel enrichment, there is a case that the output voltage of the A/F sensor is below 2.8 V (* 0.56
V), it is normal.
During fuel cut, there is a case that the output voltage of the A/F sensor is above 3.8 V (* 0.76 V), it
is normally.
If output voltage of the A/F sensor remains at 3.30 V (* 0.660 V) even after performing all the above
conditions, A/F sensor circuit may be open.
If output voltage of the A/F sensor remains at 3.8 V (* 0.76 V) or more, or 2.8 V (* 0.56 V) or less even
after performing all the above conditions, A/F sensor circuit may be short.
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester).
OK Go to step 9.
NG
3 Check for open and short in harness and connector between ECM and A/F sen-
sor (See page IN±31).
NG Repair or replace harness or connector.
OK
Page 2579 of 4770
± DIAGNOSTICSENGINE (5S±FE)
DI±159
394 Author: Date:
4 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF±1).
NG Repair or replace.
OK
6 Check EGR system (See page EC±12).
NG Repair EGR system.
OK
7 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK
Page 2580 of 4770
DI±160
± DIAGNOSTICSENGINE (5S±FE)
395 Author: Date:
8 Check injector injection (See page SF±23).
NG Replace injector.
OK
Replace A/F sensor.
9 Perform confirmation driving pattern (See page DI±152).
Go
10 Is there DTC P1133 being output again?
YES Check and replace ECM.
NO
11 Did vehicle runs out of fuel in the past?
NO Check for intermittent problems.
YES
DTC P1133 is caused by running out of fuel.
Page 2581 of 4770

A00430
HTAF (+) ON
± DIAGNOSTICSENGINE (5S±FE)
DI±161
396 Author: Date:
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Only for California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When heater operates, heater current exceeds 8 A
(2 trip detection logic)Open or short in heater circuit of A/F sensor
A/F h tP1135Heater current of 0.25 A or less when heater operates
(2 trip detection logic)A/F sensor heater
ECM
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
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 Check voltage between terminal HTAF of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HTAF of the ECM connec-
tor and body ground.
OK:
Voltage: 9 ~ 14 V
OK Check and replace ECM (See page IN±31).
NG
DI01F±05
Page 2582 of 4770
DI±162
± DIAGNOSTICSENGINE (5S±FE)
397 Author: Date:
2 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and A/F sensor,
and A/F sensor and ECM (See page IN±31).
Page 2583 of 4770

± DIAGNOSTICSENGINE (5S±FE)
DI±163
398 Author: Date:
DTC P1300 Igniter Circuit Malfunction No.1
DTC P1310 Igniter Circuit Malfunction No.2
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs and ignition signal (IGT) 1 to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal O.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM. The ECM stops fuel
injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 4 consecutive IGT1 signals during
engine runningOpen or short in IGF or IGT circuit from igniter to ECM
Ignition coil No.1 (Igniter No.1)
ECM
P1310No IGF signal to ECM for 4 consecutive IGT2 signals during
engine runningOpen or short in IGF or IGT circuit from igniter to ECM
Ignition coil No.2 (Igniter No.2)
ECM
HINT:
Ignition coil No.1 is for cylinder No.1 and No.4, and ignition coil No.2 is for cylinder No.2 and No.3.
DI01G±06
Page 2584 of 4770

A07122
IG Switch
B±R
BatteryEngine Room
J/B No.2
76B±R13
1II3B±R
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
Ignition
Coil
No.1
FL Block
Y±R
BR
B
20
19
IGT2
Tr1
E9
E9
E9
W±R
IGT1
IGF5 V
Tr1
Ignition Coil
No.2
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5 51B 1K
Instrument
W±R
W±R
2L 2A
4 1
AM2B
F4 F6 1
1
B±G
MAIN FL
3 1
4
J/C J25
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
ECM
E9 23
E9 22
E9 17
(*1) (*2)
W±R
Panel J/BB
B
BR
BR J19
J/C
DI±164
± DIAGNOSTICSENGINE (5S±FE)
399 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC P1300 is displayed, check ignition coil No.1 circuit.
If DTC P1300 is displayed, check ignition coil No.2 circuit.
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 Check for spark plug and spark of misifining cylinder (See page DI±89).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK