Page 1145 of 2389

Sub±Oxygen Sensor (CALIF. only)
INSPECTION OF SUB±OXYGEN
SENSOR
INSPECT SUB±OXYGEN SENSOR
HINT: Inspect only when code No.27 is displayed.
(a) Diagnostic code cancellation.
(See page FI±24)
(b) Warm up the engine until it reaches normal operating
temperature.
(a) (M/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h in 4th or 5th gear.
(A/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h (62 mph) in ºDº range.
(d) Following the conditions in step (e), press fully on the
accelerator pedal for 2 seconds or more.
HINT: Do not exceed 100 km/h (62 mph), or diagnostic code
will be cancelled.
(e) Stop the vehicle and turn the ignition switch to OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
If code No. 27 reappears again, check the sub±oxygen sensor
circuit. If the circuit is normal, replace the suboxygen sen-
sor. 3. (2VZ±FE)
INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminal +B and HT.
Resistance (Cold): 5.1 6.3 at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
± EFI SYSTEMElectronic Control System (Main Oxygen SensorFI±131
Page 1146 of 2389

Sub±Oxygen Sensor (CALIF. only)
INSPECTION OF SUB±OXYGEN
SENSOR
INSPECT SUB±OXYGEN SENSOR
HINT: Inspect only when code No.27 is displayed.
(a) Diagnostic code cancellation.
(See page FI±24)
(b) Warm up the engine until it reaches normal operating
temperature.
(a) (M/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h in 4th or 5th gear.
(A/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h (62 mph) in ºDº range.
(d) Following the conditions in step (e), press fully on the
accelerator pedal for 2 seconds or more.
HINT: Do not exceed 100 km/h (62 mph), or diagnostic code
will be cancelled.
(e) Stop the vehicle and turn the ignition switch to OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
If code No. 27 reappears again, check the sub±oxygen sensor
circuit. If the circuit is normal, replace the suboxygen sen-
sor. 3. (2VZ±FE)
INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminal +B and HT.
Resistance (Cold): 5.1 6.3 at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
± EFI SYSTEM
Sub±Oxygen Sensor (CALIF. only)FI±131
Page 1147 of 2389
2. INSPECT VOLTAGE OF ECU
Check the voltage between each terminal of the wiring con-
nectors.
wTurn the ignition switch ON.
wMeasure the voltage at each terminal.
HINT:
wPerform all voltage measurements with the connectors
connected.
wVerify that the battery voltage is 11 V or more when the
ignition switch is ON.
Electronic Controlled Unit (ECU)
INSPECTION OF ECU
HINT: The EFI circuit can be checked by measuring the
resistance and voltage at the wiring connectors of the ECU.
1. (2VZ±FE)
PREPARATION (See page FI±50)
± EFI SYSTEMElectronic Control System (Electronic Controlled Unit
(ECU))FI±132
Page 1148 of 2389
Voltage at ECU Wiring Connectors (3S±FE)
No trouble (ºCHECKº engine warning light off) and engine running
Stop light SW 4N (Brake pedal depressed) or defogger SW ONCheck connector TE1 ± E1 not connected
Check connector TE 1 ± E 1 connectedMeasuring plate fully closed
Ex. shift position P or N rangeIntake air temp. 20°C (68°F)
Coolant temp. 80°C (1 760F) Measuring plate fully open
Shift position P or N rangeThrottle valve fully closedThrottle valve fully closed
Heater blower SW ON Air conditioning ONThrottle valve open
Throttle valve open
Throttle valve open
Cranking or idlingIG SW ONSTD voltage (V) Condition
3,000 rpm
IG SW ONIG SW ON1G SW ON
IG SW ON Terminals
IG SW ON
CrankingIdling
± EFI SYSTEMElectronic Control System (Electronic Controlled Unit(ECU))
FI±133
Page 1149 of 2389
Voltage at ECU Wiring Connectors (2VZ±FE)
No trouble (ºCHECKº engine warning light off) and engine running
Stop light SW ON (Brake pedal depressed)Check connector TE1 ± E1 not connected
Check connector TE1 ± E1 connected
Ex. shift position P or N range Measuring plate fully closed
Intake air temp. 20°C (68°F)
Coolant temp. 80°C (176°F) Measuring plate fully open
Shift position P or N range Throttle valve fully closed
Heater blower SW ON Air conditioning ON Throttle valve open Throttle valve open
Cranking or idlingSm voltage (V)
3,000 rpm IG SW ON
IG SW ON
IG SW ON
IG SW ON
IG SW ON 1G SW ON Terminals
Cranking Idling
± EFI SYSTEMElectronic Control System (Electronic Controlled Unit(ECU))
FI±134
Page 1150 of 2389
2. INSPECT RESISTANCE OF ECU
NOTICE:
wDo not touch the ECU terminals.
wThe tester probe should be inserted into the wiring
connector from the wiring side.
Check the resistance between each terminal of the wiring
connectors.
wDisconnect the connectors from the ECU.
wMeasure the resistance at each terminal.
Resistance of ECU Wiring Connectors (3S±FE)
Measuring plate fully closed
Intake air temp. 20
°C (68°F)
Coolant temp. 80°C (176°F)
Measuring plate fully openThrottle valve fully closed
Throttle valve fully closedThrottle valve fully closed
Throttle valve fully closedThrottle valve fully open
Throttle valve fully openThrottle valve open
STD resistance ()
Throttle valve open
Condition Terminals
± EFI SYSTEMElectronic Control System (Electronic Controlled Unit
(ECU))FI±135
Page 1151 of 2389
Resistance of ECU Wiring Connectors (2VZ±FE)
Coolant temp. 80°C (176°F)
Measuring plate fully closed
Intake air temp. 20°C (68°F)
Measuring plate fully open
Throttle valve fully closed
Throttle valve fully closed Throttle valve fully openSTD resistance (
Throttle valve open TerminalsCondition
± EFI SYSTEMElectronic Control System (Electronic Controlled Unit(ECU))
FI±136
Page 1152 of 2389
Fuel Cut RPM
INSPECTION OF FUEL CUT RPM
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. INSPECT FUEL CUT RPM
(a) Disconnect the connector from the throttle position sensor.
(b) Connect terminals IDL and E1 (3S±FE (w/o ECT)) or E2
(others) of the wiring connector.
(e) Gradually raise the engine rpm and check that there is fluctua-
tion between the fuel cut and fuel return points.
HINT:
wThe vehicle should be stopped.
wMeasure with the A/C OFF.
Fuel cut rpm: 3S±FE 1,500 ± 2,100 rpm
2VZ±FE 1,800 rpm
Fuel return rpm: 3S±FE 1,000 rpm
2VZ±FE 1,200 rpm
± EFI SYSTEMElectronic Control System (Fuel Cut RPM)FI±137