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DI-122
DIAGNOSTICS - ENGINE (5VZ-FE)
DI5CA-07

DTC P1130 A/F Sensor Circuit Range/Performance Mal-
function (Bank 1 Sensor 1)

CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-42 .
DTC No. DTC Detecting Condition Trouble Area
Voltage output* of A/F sensor remains at 3.8 V or more, or
2.8 V or less, during engine running after engine is warmed
up (2 trip detection logic) S Open or short in A/F sensor circuit
*: Output value changes at inside of ECM only S A/F sensor
S Air induction system
P1130 Voltage output* of A/F sensor does not change from 3.30 V,
S Fuel pressure
during engine running after engine is warmed up
S Injector
(2 trip detection logic)
S ECM
*: Output value changes at inside of ECM only
Open or short in A/F sensor circuit (2 trip detection logic)
HINT:
S After confirming DTC P1130, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of the A/F sensor (AFS B1 S1/O2S B1 S1) from the CURRENT DATA.
S The A/F sensor's output voltage and the short-term fuel value can be read using the OBD II scan tool
or TOYOTA hand-held tester.
S The ECM controls the voltage of AF1+ and AF1- terminals of the ECM to the fixed voltage. Therefore,
it is impossible to confirm the A/F sensor output voltage without OBD II scan tool or TOYOTA hand-
held tester.
S OBD II scan tool (excluding TOYOTA hand-held tester) displays the one fifth of the A/F sensor output
voltage which is displayed on the TOYOTA hand-held tester.

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

CONFIRMATION DRIVING PATTERN
Vehicle Speed

60 - 120 km/h (4)
(38 - 75 mph)

Idling (3)
IG SW OFF (1)(2)

3 - 5 min.
Time
A00364

(1) Connect the TOYOTA hand-held tester to the DLC3.
(2) Switch the TOYOTA hand-held tester from the normal mode to the check mode (See page
DI-3 ).
2002 4RUNNER (RM887U)

Author : Date : 298
DI-123
DIAGNOSTICS - ENGINE (5VZ-FE)

(3) Start the engine and warm it up with all the accessory switches OFF.
(4) Drive the vehicle at 60 - 120 km/h (38 - 75 mph) and the engine speed at 1,600 - 3,200 rpm
for 3 - 5 min.
HINT:
If a malfunction exists, the MIL will light up during step (4).
NOTICE:
S If the conditions in this test are not strictly followed, detection of the malfunction will not be
possible.
S If you do not have a TOYOTA hand-held tester, turn the ignition switch OFF after performing
steps (3) and (4), then perform steps (3) and (4) again.

INSPECTION PROCEDURE
HINT:
S If DTC P1130 is displayed, check the bank 1 sensor 1 circuit.
S Read frame freeze 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 use-
ful for determining 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 P1130) 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 OBD II scan tool or TOYOTA hand-held tester when
you perform all the following conditions.
HINT:
The voltage of the AF1+ terminals of the ECM is fixed at 3.3 V and the voltage of the AF1- terminals 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.
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

2002 4RUNNER (RM887U)

Author : Date : 299
DI-124
DIAGNOSTICS - ENGINE (5VZ-FE)

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.

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

2002 4RUNNER (RM887U)

Author : Date : 300
DI-125
DIAGNOSTICS - ENGINE (5VZ-FE)

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.

9 Is there DTC P1130 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 ).

YES

DTC P1130 is caused by running out of fuel.

2002 4RUNNER (RM887U)

Author : Date : 301

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