Mazda Protege 5. Manual - part 171

CONTROL SYSTEM [ZM]

01–40A–37

01–40A

Circuit Open/Short Inspection

1. Remove the PCM. (See 01–40A–7 PCM REMOVAL/INSTALLATION [ZM].)
2. Connect the SST (104 Pin Breakout Box) to the 

PCM as shown.

3. Tighten the connector attaching screw.

Tightening torque

7.9—10.7 N·m 

{80—110 kgf·cm, 69.5—95.4 in·lbf}

4. Inspect for an open or short circuit in the following 

wiring harnesses by probing the applicable 
sensor and SST (104 Pin Breakout Box) terminals 
with ohmmeter leads.

•

If there is an open or short circuit, repair or 
replace wiring harnesses.

•

If there is no open or short circuit, replace the HO2S.

Open circuit

•

HO2S signal circuit (HO2S connector terminal 
A and PCM connector terminal 60 (Front), 35 
(Rear))

•

GND circuit (HO2S connector terminal B and 
PCM connector terminal 91)

Short circuit

•

HO2S signal circuit (HO2S terminal A and 
PCM connector terminal 60 (Front), 35 (Rear) 
to GND)

5. Reconnect the HO2S connector.

HO2S Heater (Front and Rear) Resistance Inspection

1. Disconnect the HO2S (Front or Rear) connector.
2. Measure the resistance between HO2S terminals C and D using an ohmmeter.

•

If not as specified, replace the HO2S.

•

If the HO2S heater is okay, but PID value or PCM terminal 94 (Front), 93 (Rear) voltage are out of 
specification, carry out the “Circuit Open/Short Inspection”.

Specification

Front: Approx. 5.6 ohms
Rear: Approx. 15.7 ohms

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CONTROL SYSTEM [ZM]

01–40A–38

Circuit Open/Short Inspection

1. Remove the PCM. (See 01–40A–7 PCM REMOVAL/INSTALLATION [ZM].)
2. Connect the SST (104 Pin Breakout Box) to the 

PCM as shown.

3. Tighten the connector attaching screw.

Tightening torque

7.9—10.7 N·m 

{80—110 kgf·cm, 69.5—95.4 in·lbf}

4. Inspect for an open or short circuit in the following 

wiring harnesses by probing the applicable 
sensor and SST (104 Pin Breakout Box) terminals 
with ohmmeter leads.

•

If there is an open or short circuit, repair or 
replace wiring harnesses.

•

If there is no open or short circuit, replace the 
HO2S.

Open circuit

•

Control circuit (HO2S connector terminal C 
and ignition switch (IG1) circuit through 
common connector)

•

GND circuit (HO2S connector terminal D and 
PCM connector terminal 94 (Front), 93 
(Rear))

Short circuit

•

Control circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector to 
GND)

•

GND circuit (HO2S connector terminal D and PCM connector terminal 94 (Front), 93 (Rear) to GND)

5. Reconnect the HO2S connector.

End Of Sie

EGR BOOST SENSOR INSPECTION [ZM]

A3U014018211W02

Note

•

Perform the following test only when directed.

•

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

1. Remove the PCM. (See 01–40A–7 PCM REMOVAL/INSTALLATION [ZM].)
2. Connect the SST (104 Pin Breakout Box) to the 

PCM as shown.

3. Tighten the connector bolt.

Tightening torque

7.9—10.7 N·m 

{80—110 kgf·cm, 69.5—95.4 in·lbf}

Caution

••••

Do not apply vacuum outside of the 
specified limits, or EGR boost sensor will 
be damaged.

4. Turn the ignition switch to ON.

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CONTROL SYSTEM [ZM]

01–40A–39

01–40A

5. Disconnect the vacuum hose between the EGR 

boost sensor and intake manifold.

Note

•

The output voltage varies with the 
measuring condition.

6. Verify that the PCM terminal 34 voltage is within 

specification.

Measuring condition:

Input voltage: 4.5—5.5 V
Ambient temperature: 10—50 

°°°°

C {50—122 

°°°°

F}

Sea level: –20—3,000 m {–656—9,840 ft}

Specification

BARO V variation: 2.3—4.7 V

7. Apply vacuum of –26.6 kPa {–200 mmHg, –7.85 inHg} to EGR boost sensor and verify that PCM 34 terminal 

voltage from Step 6 is within specification.

•

If not as specified, carry out the “Circuit Open/Short Inspection”.

Specification

BARO V variation: 0.8—1.3 V

Circuit Open/Short Inspection

1. Remove the PCM. (See 01–40A–7 PCM REMOVAL/INSTALLATION [ZM].)
2. Connect the SST (104 Pin Breakout Box) to the 

PCM as shown.

3. Tighten the connector attaching screw.

Tightening torque

7.9—10.7 N·m 

{80—110 kgf·cm, 69.5—95.4 in·lbf}

4. Inspect for an open or short circuit in the following 

wiring harnesses by probing the applicable 
sensor and SST (104 Pin Breakout Box) terminals 
with ohmmeter leads.

•

If there is an open or short circuit, repair or 
replace wiring harnesses.

•

If there is no open or short circuit, replace the EGR boost sensor.

Open circuit

•

EGR boost (Barometric pressure) signal circuit (EGR boost sensor connector terminal A and PCM 
connector terminal 34)

•

Constant voltage circuit (EGR boost sensor connector terminal C and PCM connector terminal 90)

•

GND circuit (EGR boost sensor connector terminal B and PCM connector terminal 91)

Short circuit

•

EGR boost (Barometric pressure) signal 
circuit (EGR boost sensor connector terminal 
A and PCM connector terminal 34)

•

Constant voltage circuit (EGR boost sensor 
connector terminal C and PCM connector 
terminal 90)

5. Reconnect the EGR boost sensor connector.

End Of Sie

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CONTROL SYSTEM [ZM]

01–40A–40

FUEL TANK PRESSURE SENSOR INSPECTION [ZM]

A3U014018212W02

Note

•

Perform the following test only when directed.

•

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

1. Remove the PCM. (See 01–40A–7 PCM REMOVAL/INSTALLATION [ZM].)
2. Connect the SST (104 Pin Breakout Box) to the 

PCM as shown.

3. Tighten the connector bolt.

Tightening torque

7.9—10.7 N·m 

{80—110 kgf·cm, 69.5—95.4 in·lbf}

Caution

••••

Do not apply vacuum outside of the 
specified limits, or the fuel tank pressure 
sensor will be damaged.

4. Turn the ignition switch to ON.
5. Apply pressure then vacuum to the fuel tank 

pressure sensor according to the following 
procedure.

Note

•

The output voltage varies with the 
measuring condition.

6. Decrease the applied pressure from +.66 kPa 

{+50 mmHg, +1.97 inHg} to –6.66 kPa {–50 
mmHg, –1.97 inHg} and verify that the PCM 
terminal 62 voltage decreases accordingly as 
specified.

•

If not as specified, replace the fuel tank 
pressure sensor.

•

If fuel tank pressure sensor is okay, but PCM terminal 62 voltage is out of specification, carry out the 
“Circuit Open/Short Inspection”.

Specification

*

: Measuring condition is as follows.

Input voltage: 5.0 V
Barometric pressure: 101.3 kPa {760 mmHg, 29.9 inHg} (Absolute pressure)
Barometric temperature: 30—100 

°°°°

C {0—182 

°°°°

F}

Applied vacuum

Output voltage (V)*

–6.66 kPa 

{–50 mmHg, –1.97 inHg}

0.45—0.55

0 kPa {0 mmHg, 0 inHg}

2.25—2.75

+6.66 kPa 

{+50 mmHg, +1.97 inHg}

4.05—4.95

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