DTC P0032:00 [MZR 1.6]

DTC P0032:00	A/F sensor heater control circuit high input
DETECTION CONDITION	• If the input voltage to the A/F sensor heater drive terminal in the PCM is high for 1 s or more even though the A/F sensor is duty-controlled at 10% or more by the PCM. Note • A/F sensor heater is controlled by duty signal. Diagnostic support note • This is an intermittent monitor (A/F sensor heater, HO2S heater). • The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• A/F sensor connector or terminals malfunction • A/F sensor heater malfunction • PCM connector or terminals malfunction • Short to power supply in wiring harness between A/F sensor terminal D and PCM terminal 2BD • PCM malfunction

DTC P0032:00

A/F sensor heater control circuit high input

DETECTION CONDITION

• If the input voltage to the A/F sensor heater drive terminal in the PCM is high for 1 s or more even though the A/F sensor is duty-controlled at 10% or more by the PCM.

Note

• A/F sensor heater is controlled by duty signal.

Diagnostic support note

• This is an intermittent monitor (A/F sensor heater, HO2S heater).

• The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• A/F sensor connector or terminals malfunction

• A/F sensor heater malfunction

• PCM connector or terminals malfunction

• Short to power supply in wiring harness between A/F sensor terminal D and PCM terminal 2BD

• PCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor heater, HO2S heater related) been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	INSPECT A/F SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the A/F sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
No	Go to the next step.
4	INSPECT A/F SENSOR HEATER • Inspect the A/F sensor heater. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 7. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
No	Go to the next step.
6	INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the A/F sensor and PCM connectors are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the A/F sensor terminal D (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
No	Refer to the wiring diagram and verify whether or not there is a common connector between A/F sensor terminal D and PCM terminal 2BD. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to the next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [MZR 1.6].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].) Go to the next step.
No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor heater, HO2S heater related) been recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.

VERIFY RELATED SERVICE INFORMATION AVAILABILITY

• Verify related Service Information availability.

• Is any related Service Information available?

Yes

Perform repair or diagnosis according to the available Service Information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT A/F SENSOR CONNECTOR CONDITION

• Switch the ignition off.

• Disconnect the A/F sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 7.

Go to the next step.

INSPECT A/F SENSOR HEATER

• Inspect the A/F sensor heater.

(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the A/F sensor, then go to Step 7.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 7.

Go to the next step.

INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY

• Verify that the A/F sensor and PCM connectors are disconnected.

• Switch the ignition ON (engine off).

Note

• Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the A/F sensor terminal D (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

Refer to the wiring diagram and verify whether or not there is a common connector between A/F sensor terminal D and PCM terminal 2BD.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to the next step.

VERIFY DTC TROUBLESHOOTING COMPLETED

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

(See AFTER REPAIR PROCEDURE [MZR 1.6].)

• Perform the KOEO or KOER self test.

(See KOEO/KOER SELF TEST [MZR 1.6].)

• Is the PENDING CODE for this DTC present?

Yes