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Typical Malfunction Thresholds: 1 Inspect Heated Oxygen Sensor (Heater Resistance)

The document provides diagnostic information for the SFI system, including typical malfunction thresholds, component operating ranges, and an inspection procedure for the heated oxygen sensor. It lists detection criteria and thresholds for high and low current codes related to the heated oxygen sensor heater. It also gives the standard operating range for heater current under different engine conditions. The inspection procedure includes checking the resistance of the heated oxygen sensor heater.

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Clodoaldo Biassio
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56 views1 page

Typical Malfunction Thresholds: 1 Inspect Heated Oxygen Sensor (Heater Resistance)

The document provides diagnostic information for the SFI system, including typical malfunction thresholds, component operating ranges, and an inspection procedure for the heated oxygen sensor. It lists detection criteria and thresholds for high and low current codes related to the heated oxygen sensor heater. It also gives the standard operating range for heater current under different engine conditions. The inspection procedure includes checking the resistance of the heated oxygen sensor heater.

Uploaded by

Clodoaldo Biassio
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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05–62

DIAGNOSTICS – SFI SYSTEM (April, 2003)

TYPICAL MALFUNCTION THRESHOLDS


Detection Criteria Threshold
P0032, P0038 (High current):
Heated oxygen sensor heater current More than 2 A (while intrusive heating is off)
P0031, P0037 (Low current):
Heated oxygen sensor heater current Less than 0.25 A (at 0.3 seconds after heater ”ON”)

COMPONENT OPERATING RANGE


Parameter Standard Value
Heated oxygen sensor heater current under the following
conditions:
 Idling 0.4 to 1.0 A
 Heated oxygen sensor is warmed up
 Battery voltage is 11 to 14 V

MONITOR RESULT (MODE 06 DATA)


Conversion
Test ID Comp ID Description of Test Data Description of Test Limit Unit
Factor
Maximum threshold heater current
Maximum heated oxygen sensor Multiply by
$04 $81 to $82 to detect heated oxygen sensor A
heater current 0.000076
heater circuit malfunction

Refer to page 05–27 for detailed information on Checking Monitor Status.


WIRING DIAGRAM
Refer to DTC P0130 on page 05–101.
INSPECTION PROCEDURE
HINT:
 If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.
 Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determin-
ing 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 INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE)

Component Side: (a) Disconnect the H5 or H8 heated oxygen sensor connec-


Heated Oxygen Sensor tor.
H5 Sensor 1 H8 Sensor 2 (b) Measure the resistance between the terminals of the
heated oxygen sensor connector.
HT
+B HT Standard:
+B
Tester Connection Specified Condition
E1 OX OX HT (H5–1) – +B (H5–2) 5 to 10 Ω at 20 C (68 F)
E1 HT (H5–1) – E1 (H5–4) 10 kΩ or higher
Front View A84787 HT (H8–2) – +B (H8–1) 5 to 10 Ω at 20 C (68 F)
HT (H8–2) – E1 (H8–3) 10 kΩ or higher
(c) Reconnect the heated oxygen sensor connector.
NG REPLACE HEATED OXYGEN SENSOR

OK

2004 COROLLA (RM1037U)

Author: Date: 227

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