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DI-126
DIAGNOSTICS - ENGINE (5VZ-FE)
DI5CB-07

DTC P1133 A/F Sensor Circuit Response Malfunction
(Bank 1 Sensor 1)

CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-42 .
DTC No. DTC Detecting Condition Trouble Area
S Open or short in A/F sensor circuit
After engine is warmed up and during vehicle driving at S A/F sensor
engine speed 1,400 rpm or more and vehicle speed 60 S Air induction system
P1133
km/h (38 mph) or more, if response characteristic of A/F S Fuel pressure
sensor becomes deteriorated (2 trip detection logic) S Injector
S ECM

WIRING DIAGRAM
Refer to DTC P0125 on page DI-42 .

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the 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 deter-
mining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was
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.

2 Connect OBDII scan tool or TOYOTA hand-held tester, and read value for volt-
age 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 speed at 2,500 rpm for approx. 90 sec.
CHECK:
Read the voltage of the A/F sensor on the screen of the OBD II scan tool or TOYOTA hand-held tester when
you perform all the following conditions.
HINT:
The voltage of the AF1+ terminal of the ECM is fixed at 3.3 V and the voltage of the AF1- terminal is fixed
at 3.0 V. Therefore, it is impossible to check the A/F sensor output voltage at the terminals (AF1+/AF1-) of
the ECM.

2002 4RUNNER (RM887U)

Author : Date : 302
DI-127
DIAGNOSTICS - ENGINE (5VZ-FE)

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 valve *: When you use the OBD II scan tool (excluding TOYOTA hand-held tester)
open and close
HINT:
S 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.
S 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 normal.
S If the output voltage of the A/F sensor remains at 3.30 V (0.660 V*) even after performing all the above
conditions, the A/F sensor circuit may be open.
S If the output voltage of the A/F sensor 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, the A/F sensor circuit may be short.
*: When you use the OBD II scan tool (excluding TOYOTA hand-held tester).

OK Go to step 8.

3 Check for open and short in harness and connector between ECM and A/F sen-
sor (See page IN-28 ).

NG Repair or replace harness or connector.

4 Check resistance of A/F sensor heater (See page SF-51 ).

NG Replace A/F sensor.

5 Check air induction system (See page SF-1 ).

NG Repair or replace.

2002 4RUNNER (RM887U)

Author : Date : 303
DI-128
DIAGNOSTICS - ENGINE (5VZ-FE)

6 Check fuel pressure (See page SF-7 ).

NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF-1 ).

7 Check injector injection (See page SF-21 ).

NG Replace injector.

Replace A/F sensor.

8 Perform confirmation driving pattern (See page DI-122 ).

9 Is there DTC P1133 being output again?

YES Check and replace ECM (See page IN-28 ).

10 Did vehicle runs out of fuel in past?

NO Check for intermittent problems (See page
DI-3 ).

2002 4RUNNER (RM887U)

Author : Date : 304
DI-129
DIAGNOSTICS - ENGINE (5VZ-FE)

YES

DTC P1133 is caused by running out of fuel.

2002 4RUNNER (RM887U)

Author : Date : 305

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