Inspection Procedure

HINT:

It is possible that the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The ACTIVE TEST can determine if the heated oxygen sensor or other potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5% (decrease) or +25% (increase) by the ACTIVE TEST.

The ACTIVE TEST procedure enables a technician to check and graph the output voltage of the heated oxygen sensors.

Procedure:

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the engine switch on (IG).
Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
Perform the ACTIVE TEST while the engine is idling.

Standard:

The heated oxygen sensor reacts in accordance with the increase and decrease of injection volume:

+25% → RICH output: More than 0.55 V

-12.5% → LEAN output: Less than 0.4 V

NOTE: The heated oxygen sensor (sensor 1) output has a few seconds of delay and the heated oxygen sensor (sensor 2) output has a maximum of 20 seconds of delay.
If the vehicle is short on fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded.

Fig 1: Heated Oxygen Sensor Voltage Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.
Bank 1 refers to the bank that includes No. 1 cylinder.
Bank 2 refers to the bank that does not include No. 1 cylinder.
No. 1 cylinder is located in the front part of the engine, opposite the transmission.
Sensor 1 refers to the sensor closest to the engine body.

CHECK OTHER DTC OUTPUT

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES
Read the DTCs.

Result

RESULT CHART

Display (DTC output)	Proceed to
P0133 or P0153	A
P0133 or P0153 and other DTCs	B

B: GO TO RELEVANT DTC CHART

A: Go to next step

READ DATA LIST (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)
1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
2. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / O2S B1S1 (O2S B2S1).
3. Allow the engine to run for 90 seconds at 2,500 rpm.
4. Read the heated oxygen sensor voltage while the engine is idling.
  OK:
  
  The heated oxygen sensor voltage alternates between less than 0.4 V and more than 0.55 V, and the period "t" must be less than 0.9 seconds (see the following table).
Fig 2: Heated Oxygen Sensor Voltage Graph
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step 9

NG: Go to next step

INSPECT HEATED OXYGEN SENSOR

Disconnect the E23 and E44 sensor connectors.

Measure the resistance of the sensor.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1 (HT1A) - 2 (+B)	11 to 16 Ω
1 (HT2A) - 2 (+B)	11 to 16 Ω
1 (HT1A) - 4 (E2)	10 kΩ or higher
1 (HT2A) - 4 (E2)	10 kΩ or higher

Fig 3: Identifying E23 And E44 Sensor Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEATED OXYGEN SENSOR

OK: Go to next step

INSPECT INTEGRATION RELAY (EFI MAIN)

Remove the integration relay from the engine room No. 2 junction block.

Measure the resistance of the EFI MAIN relay.

Standard resistance

TERMINAL CONNECTIONS SPECIFIED CONDITION CHART

Terminal Connections	Specified Condition
2A-8 - 2C-1	10 kΩ or higher
2A-8 - 2C-1	Below 1 Ω (when battery voltage is applied to terminals 2A-6 and 2A-7)

Fig 4: Identifying Integration Relay Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE INTEGRATION RELAY

OK: Go to next step

CHECK WIRE HARNESS (HEATED OXYGEN SENSOR (SENSOR 1) - ECM)

Disconnect the E23 and E44 heated oxygen sensor connectors.
Disconnect the E6 and E8 ECM connectors.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
E23-1 (HT1A) - E8-24 (HT1A)	Below 1 Ω.
E23-3 (OX1A) - E8-30 (OX1A)	Below 1 Ω
E44-1 (HT2A) - E6-5 (HT2A)	Below 1 Ω
E44-3 (OX2A) - E6-28 (OX2A)	Below 1 Ω
E23-1 (HT1A) or E8-24 (HT1A) - Body ground	10 kΩ or higher
E23-3 (OX1A) or E8-30 (OX1A) - Body ground	10 kΩ or higher
E44-1 (HT2A) or E6-5 (HT2A) - Body ground	10 kΩ or higher
E44-3 (OX2A) or E6-28 (OX2A) - Body ground	10 kΩ or higher

Fig 5: Identifying E6 And E8 ECM Connectors

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leaks.
  OK:
  
  There are no vacuum leaks in air induction system.
NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK: Go to next step
CHECK FUEL PRESSURE
1. Check the fuel pressure (see REMOVAL ).
NG: REPAIR OR REPLACE FUEL PRESSURE

OK: Go to next step
INSPECT FUEL INJECTOR
1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor).
NG: REPLACE FUEL INJECTOR

OK: REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN
HINT:

Clear all DTCs before performing the confirmation driving pattern.

READ OUTPUT DTC (DTC P0133 OR P0153 IS OUTPUT AGAIN)

Clear the DTC (see DTC CHECK / CLEAR ).
Start the engine and allow the engine to idle for 15 seconds or more.
Read the DTC.

Result

RESULT CHART

Display (DTC output)	Proceed to
P0133 or P0153	A
P0133 or P0153 and other DTCs	B

B: CHECK FOR INTERMITTENT PROBLEMS

A: REPLACE HEATED OXYGEN SENSOR