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SF-63
SFI (1GR-FE) - AIR-FUEL RATIO (A/F) SENSOR
AIR-FUEL RATIO (A/F) SENSOR
+B HT SF1ZC-01
INSPECTION
1. INSPECT AIR FUEL RATIO SENSOR (BANK1, BANK2
AIR FUEL RATIO SENSOR)
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance:
AF- AF+ A23238 Terminal No. Resistance
1 (HT) 2 (+B) 1.8 to 3.4 at 20 _C (68 _F)
1 (HT) 2 (+B) 5.0 to 7.5 at 500 _C (932 _F)
1 (HT) 4 (AF-) No Continuity
If the resistance is not as specified, replace the sensor.
E1 2. INSPECT AIR-FUEL RATIO COMPENSATION SYS-
TEM
(a) Measure the voltage between terminals of the ECM.
Standard voltage:
Terminal No. Condition Voltage
A1A+ E1 IG switch ON 3.3V
A1A- E1 IG switch ON 3.0V
A2A+ E1 IG switch ON 3.3V
A2A- E1 IG switch ON 3.0V
NOTICE:
Connect test leads from the back side of the ECM connec-
tor.
A2A+ A1A+
HINT:
The voltage between terminals of the ECM is kept constant re-
gardless of the voltage of the A/F sensor.
(b) Connect the hand-held tester to the DLC3.
(c) Select "DATA MONITOR" - "A/FS B1 S1", "A/FS B2 S1"
and "O2S B1 S2" to display the monitor.
A2A- A1A- A23442 (d) Warm up the A/F sensor by running the engine at 2,500
rpm for approx. 2 minutes.
Keep the engine speed (e) Keep the engine speed at 2,500 rpm and confirm that the
Lean displays of the "A/FS B1 S1" and "A/FS B2 S1" are similar
to the illustration on the left.
(V)
NOTICE:
3.3 14.7 The illustration differs from the real display.
Air
Fuel
HINT:
Ratio The waveform of the A/F sensor is displayed only on the hand-
Rich held tester.
Time A23239 (f) Confirm that the display of the "O2S B1 S2" changes be-
tween 0V to 1V with the engine speed at 2,500 rpm.
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