Mazda 6 Service Manual: Knock sensor inspection

Mazda 6 Service Manual / Fuel and emission control systems / Control system / Knock sensor inspection

Note

Perform the following test only when directed.

Resistance Inspection

1. Turn the ignition switch to LOCK.

2. Disconnect the knock sensor connector.

3. Measure the resistance between the knock sensor terminals A and B using an ohmmeter.

If not as specified, replace the knock sensor.
If the knock sensor is okay, but PID value is out of specification, perform the Circuit Open/Short Inspection.

Specification
Approx. 4.87 megohms

Circuit Open/Short Inspection

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

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

Open circuit

If there is no continuity, the circuit is open. Repair or replace the harness.

- Knock sensor terminal A (harness-side) and PCM terminal 2S (harness-side)

- Knock sensor terminal B (harness-side) and PCM terminal 2P (harness-side)

Short circuit

If there is continuity, the circuit is shorted. Repair or replace the harness.

- Knock sensor terminal A (harness-side) and power supply

- Knock sensor terminal A (harness-side) and body GND

- Knock sensor terminal B (harness-side) and power supply

- Knock sensor terminal B (harness-side) and body GND

Camshaft position (cmp) sensor inspection

Caution When foreign material such as an iron chip is on the CMP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be s ...

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. ...

Other materials:

Mazda 6 Service Manual: Rear door garnish installation
Note Double-sided adhesive tape has already been attached to the new rear door garnish. Warning Using a razor with bare hands can cause injury. Always wear gloves when using a razor. 1. When installing a new rear door garnish, follow the procedure below: (1) Remove the adhesi ...

Mazda 6 Service Manual: Underbody Maintenance
Road chemicals and salt used for ice and snow removal and solvents used for dust control may collect on the underbody. If not removed, they will speed up rusting and deterioration of such underbody parts as fuel lines, frame, floor pan, and exhaust system, even though these parts may be coated ...