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DTC P0032: Heated
Oxygen Sensor (front) Heater Control Circuit High <California>
CIRCUIT OPERATION
- Power is supplied from the MFI relay (terminal No. 2)
to the heated oxygen sensor (front) heater.
- The ECM (terminal No. 34) controls continuity to the heated oxygen sensor (front)
heater by turning the power transistor in the ECM "ON" and "OFF".
TECHNICAL DESCRIPTION
- The ECM checks whether the heater current is within a specified range when the heater
is energized.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor heater (front) current is out
of specified range.
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
- More than 2 seconds have passed since the engine starting sequence was completed.
- While the heated oxygen sensor (front) heater is on.
- Battery positive voltage is between 11 and 16.5 volts.
Judgement Criterion
- The heated oxygen sensor (front) heater current has continued to be higher than 10.5
amperes for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive
Cycle - Pattern 2 
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TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Heated oxygen sensor (front) heater failed.
- ECM failed.
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STEP 1. Check the heated oxygen sensor (front).
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(1)Disconnect heated oxygen sensor (front) connector B-05 and connect test harness
special tool, MD998464, to the connector on the heated oxygen sensor (front) side.
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(2)Measure the resistance between heated oxygen sensor connector terminal No. 1 (red clip)
and terminal No. 3 (blue clip).
Standard value: 4.5 - 8.0 Ω [at 20°C (68°F)]
Q.
Is the measured resistance between 4.5 and 8.0 Ω [at 20°C
(68°F)]?
 Go to Step 2.
 Replace the heated oxygen sensor (front). Then go to Step 3.
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STEP 2. Check the trouble symptoms.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II
Drive Cycle - Pattern 2 .
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(2)Check the diagnostic trouble code (DTC).
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Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 3.
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It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
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STEP 3. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II
Drive Cycle - Pattern 2 .
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(2)Check the diagnostic trouble code (DTC).
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Retry the troubleshooting.
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The inspection is complete.
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