Mazda 6. Manual — part 134

F–58

CONTROL SYSTEM

Circuit Open/Short Inspection (Heater)

1. Disconnect the PCM connector. (See

F–43 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.
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

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

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

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POWER STEERING PRESSURE (PSP) SWITCH INSPECTION

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Note

• Perform the following inspection only when directed.

Continuity Inspection

1. Inspect the following if the power steering is inoperative (See

N–4 POWER STEERING FLUID INSPECTION

.):

• Power steering fluid level

• Power steering fluid leakage

• Power steering fluid pressure

2. Disconnect the PSP switch connector.
3. Start the engine.
4. Inspect for continuity between the PSP switch terminal and GND using an ohmmeter.

• If not as specified, replace the PSP switch.

• If the PSP switch is okay, but PSP PID value is out of specification, perform the “Circuit Open Inspection”.

Specification

Circuit Open Inspection

1. Disconnect the PCM connector. (See

F–43 PCM REMOVAL/INSTALLATION

.)

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

Open circuit

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

— PSP switch terminal (harness-side) and PCM terminal 1Z (harness-side)

Short circuit

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

— PSP switch terminal (harness-side) and body GND

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CONTROL SYSTEM

F–59

F

CLUTCH SWITCH INSPECTION

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Note

• Perform the following inspection only when directed.

Continuity Inspection

1. Verify that the clutch switch is installed properly.
2. Disconnect the negative battery cable.
3. Remove the clutch switch.
4. Inspect for continuity between the clutch switch

terminals using an ohmmeter.

• If the clutch switch is okay, but CPP PID value

is out of specification, carry out of the “Clutch
Switch Circuit Open/Short Inspection”.

• If not as specified, replace the clutch switch.

Specification

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See

F–43 PCM

REMOVAL/INSTALLATION

.)

2. Inspect the following harness for open or short.

(Continuity check)

Open circuit

• Clutch switch terminal B (harness-side) and PCM

terminal 1R

• Clutch switch terminal D and body GND

Short circuit

• Clutch switch terminal B (harness-side) and

power supply

• Clutch switch terminal B (harness-side) and body

GND

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NEUTRAL SWITCH INSPECTION

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Note

• Perform the following inspection only when directed.

Continuity Inspection

1. Disconnect the negative battery cable.
2. Remove the neutral switch.

J–5 MANUAL TRANSAXLE REMOVAL/INSTALLATION

.)

3. Inspect for continuity between the neutral switch

terminals using an ohmmeter.

• If the neutral switch is okay, but CPP/PNP PID

value is out of specification, carry out of the
“Circuit Open/Short Inspection”.

• If not as specified, replace the neutral switch.

Specification

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A6E3940W022

A6E3940W021

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F–60

CONTROL SYSTEM

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See

F–43 PCM

REMOVAL/INSTALLATION

.)

2. Inspect the following harness for open or short.

(Continuity check)

Open circuit

• Neutral switch terminal B (harness-side) and

PCM terminal 1W (harness-side)

• Neutral switch terminal A (harness-side) and

body GND

Short circuit

• Neutral switch terminal B (harness-side) and

body GND

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BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION

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Note

• Perform the following inspection only when directed.

• The following vacuum values are indicated by relative pressure from the barometric pressure sensor.

1. Connect the SSTs (WDS or equivalent) to the DLC-2.
2. Turn the ignition switch to ON.
3. Select BARO on the SSTs (WDS or equivalent).
4. Verify that the BARO PID (pressure) and barometric pressure are practically equal.

• If not as verified, perform the “Circuit Open/Short Inspection”.

— If there is no open or short circuit, replace the barometric pressure sensor.

• If as verified, go to next step.

5. Apply vacuum of –25.0 kPa {–187 mmHg, –7.38 inHg} to the barometric pressure sensor, and verify that the

BARO variation from that of Step 4 is approx. 25.0 kPa {187 mmHg, 7.38 inHg}.

• If not as verified, perform the “Circuit Open/Short inspection”.

— If there is no open or short circuit, replace the barometric pressure sensor.

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See

F–43 PCM

REMOVAL/INSTALLATION

.)

2. Inspect the following wiring harness for open or

short. (Continuity check)

Open circuit

• If there is no continuity, the circuit is open. Repair

or replace the harness.
— Barometric pressure sensor terminal A

(harness-side) and PCM terminal 1G

— Barometric pressure sensor terminal B

(harness-side) and PCM terminal 2H

— Barometric pressure sensor terminal C

(harness-side) and PCM terminal 2K

Short circuit

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

— Barometric pressure sensor terminal C (harness-side) and power supply.
— Barometric pressure sensor terminal C (harness-side) and body GND.
— Barometric pressure sensor terminal A (harness-side) and power supply.
— Barometric pressure sensor terminal A (harness-side) and body GND

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A6E3940W024

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ON-BOARD DIAGNOSTIC

F–61

F

FOREWORD

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• When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and

diagnostic trouble code (DTC), then diagnose the malfunction according to following flowchart.
— If a DTC exists, diagnose the applicable DTC inspection. (See

F–67 DTC TABLE

.)

— If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom

troubleshooting. (See

F–181 ENGINE SYMPTOM TROUBLESHOOTING

.)

*

: Malfunction Indicator lamp (MIL), Generator Warning Light, Security Light

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ON-BOARD DIAGNOSTIC

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