Mazda 6 manuals

Mazda 6 Service Manual: Heated oxygen sensor (ho2s) inspection

Mazda 6 Service Manual / Fuel and emission control systems / Control system / Heated oxygen sensor (ho2s) inspection

HO2S Voltage Inspection

Note

1. Warm up the engine and run it at idle.

2. Disconnect the HO2S connector.

3. Connect the voltmeter test leads to the following HO2S terminals:

- (+) leadterminal A

- (-) leadterminal B


4. With the vehicle stopped, run the engine at 3,000 rpm

until the voltmeter moves between 0.5 and 0.7 V.

5. Verify that the measurement voltage changes when the engine speed increases and decreases suddenly several times.

Specification


Circuit Open/Short Inspection (Sensor)

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)


2. Inspect the following wiring harnesses for open or short. (Continuity check)

Open circuit

Front

- HO2S terminal A (harness-side) and PCM terminal 1AB (harness-side)

- HO2S terminal B (harness-side) and PCM terminal 2H (harness-side)

Rear

- HO2S terminal A (harness-side) and PCM terminal 1Y (harness-side)

- HO2S terminal B (harness-side) and PCM terminal 2H (harness-side)

Short circuit

Front and Rear

- HO2S terminal A (harness-side) and body GND

- HO2S terminal A (harness-side) and power supply

- HO2S terminal B (harness-side) and power supply

HO2S Heater Resistance Inspection

1. Disconnect the HO2S connector.

2. Measure the resistance between the HO2S terminals C and D.

Specification
Front : 3.0-3.6 ohms
Rear : 5-7 ohms


Circuit Open/Short Inspection (Heater)

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)


2. Inspect the following wiring harnesses for open or short. (Continuity check)

Open circuit

Front

- HO2S terminal C (harness-side) and ignition switch

- HO2S terminal D (harness-side) and PCM terminal 4A (harness-side)

Rear

- HO2S terminal C (harness-side) and ignition switch

- HO2S terminal D (harness-side) and PCM terminal 4D (harness-side)

Short circuit

Front and rear

- HO2S terminal C (harness-side) and body GND

- HO2S terminal D (harness-side) and power supply

- HO2S terminal D (harness-side) and body GND

Knock sensor removal/installation
1. Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.) 2. Remove the knock sensor attachment bolt to remove the knock sensor. 3. Install in the reverse order of removal. ...

Power steering pressure (psp) switchinspection
Note Perform the following inspection only when directed. Continuity Inspection 1. Inspect the following if the power steering is inoperative (See POWER STEERING FLUID INSPECTION.): Powe ...

Other materials:

Mazda 6 Service Manual: Operating Tips for USB device
This unit plays audio files as follows: CAUTION Do not use an audio file extension on files other than audio files. In addition, do not change the audio file extension. Otherwise, the unit will not recognize the file correctly resulting in noise or a malfunction. NOTE Playback may not b ...

Mazda 6 Service Manual: Outside Mirrors
WARNING Be sure to look over your shoulder before changing lanes: Changing lanes without taking into account the actual distance of the vehicle in the convex mirror is dangerous. You could have a serious accident. What you see in the convex mirror is closer than it appears. Mirror type Flat ...

© 2016-2021 Copyright www.mazda6info.net