Mazda CX 7. Manual - part 113

COOLING SYSTEM [L3 WITH TC]

01-12–7

01-12

COOLING SYSTEM CAP INSPECTION[L3 WITH TC]

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Warning

• Never remove the cooling system cap or loosen the radiator drain plug while the engine is 

running, or when the engine and radiator are hot. Scalding engine coolant and steam may shoot 
out and cause serious injury. It may also damage the engine and cooling system.

• Turn off the engine and wait until it is cool. Even then, be very careful when removing the cap. 

Wrap a thick cloth around it and slowly turn it counterclockwise to the first stop. Step back while 
the pressure escapes.

• When you are sure all the pressure is gone, press down on the cap using the cloth, turn it, and 

remove it.

1. Clean the cooling system cap and the sealed part.
2. Inspect the cooling system cap for cracks or everted seal.

• If there is any malfunction, replace the cooling system cap.

3. Attach the cooling system cap to the SST and a 

radiator cap tester.

4. Hold the cooling system cap downward and apply 

pressure gradually. Verify that the pressure is held 
stable for 10 s.

• If the pressure is not held stable, replace the 

cooling system cap.

Cooling system cap valve opening pressure

 112.8— 142.2 kPa {1.15— 1.45 kgf/cm

2

, 

16.4— 20.6 psi}

End Of Sie

COOLANT RESERVE TANK REMOVAL/INSTALLATION[L3 WITH TC]

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1. Remove the charge air cooler duct. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH 

TC].)

2. Remove in the order indicated in the table.
3. Install in the reverse order of removal..

COOLING SYSTEM CAP

49 9200 145

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1

Wiring harness

2

Hose

3

Coolant reserve tank
(See 01-12-8 Coolant Reserve Tank Removal Note.)

A

3

1

2

A

A

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COOLING SYSTEM [L3 WITH TC]

01-12–8

Coolant Reserve Tank Removal Note

1. Remove the coolant reserve tank from the 

radiator cowling tabs shown in the figure by lifting 
them with a flathead screwdriver.

End Of Sie

RADIATOR REMOVAL/INSTALLATION[L3 WITH TC]

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Warning

• Never remove the cooling system cap or loosen the radiator drain plug while the engine is 

running, or when the engine and radiator are hot. Scalding engine coolant and steam may shoot 
out and cause serious injury. It may also damage the engine and cooling system.

• Turn off the engine and wait until it is cool. Even then, be very careful when removing the cap. 

Wrap a thick cloth around it and slowly turn it counterclockwise to the first stop. Step back while 
the pressure escapes.

• When you are sure all the pressure is gone, press down on the cap using the cloth, turn it, and 

remove it.

1. Disconnect the negative battery cable.
2. Drain the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)
3. Remove the charge air cooler duct, air cleaner and fresh air duct component. (See 01-13-5 INTAKE AIR 

SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)

4. Remove the coolant reserve tank. (See 01-12-7 COOLANT RESERVE TANK REMOVAL/INSTALLATION[L3 

WITH TC].)

5. Remove the dipstick pipe. (See 01-11-6 OIL PAN REMOVAL/INSTALLATION[L3 WITH TC].)
6. Remove the cooling fan component. (See 01-12-12 FAN MOTOR REMOVAL/INSTALLATION[L3 WITH TC].)
7. Remove the under cover.
8. Disconnect the ATF oil cooler hose from the radiator.
9. Remove in the order indicated in the table.

10. Install in the reverse order of the removal.
11. Refill the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)
12. Inspect for engine coolant leakage. (See 01-12-6 ENGINE COOLANT LEAKAGE INSPECTION[L3 WITH TC].)
13. Inspect the ATF level. (See 05-17-10 AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[AW6A-EL, 

AW6AX-EL].)

TAB

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01-02

ON-BOARD DIAGNOSTIC [L3 WITH TC]

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

01-02–9

Simulation Function Procedure

1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following 

items from the initial screen of the M-MDS.

• When using the IDS (notebook PC)

1. Select the “Toolbox” tab.
2. Select “DataLogger”.
3. Select “Module”.
4. Select “PCM”.

• When using the PDS (pocket PC)

1. Select “Module Tests”.
2. Select “PCM”.
3. Select “DataLogger”.

3. Select the simulation items from the PID table.
4. Perform the simulation function, inspect the 

operations for each parts.

• If there is no operation sound from the relay, motor, and solenoid after the simulation function inspection is 

performed, it is possible that there is an open or short circuit in the wiring harness, relay, motor or solenoid, 
or sticking and operation malfunction.

End Of Sie

DIAGNOSTIC MONITORING TEST RESULTS[L3 WITH TC]

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• The purpose of this test mode is to confirm the result of the OBD-II monitor diagnostic test results. The result 

values stored when a particular monitor is completed are displayed. If the monitor is not completed, the initial 
value is displayed.

*1

: California emission regulation applicable model

End Of Sie

DLC-2

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TEST ID

Description

Related system

10: 01: 80

HO2S (Front) lean-to-rich response time (calculated)

HO2S

10: 02: 03

Low HO2S (Rear) voltage for switch time calculation (constant)

10: 02: 04

High HO2S (Rear) voltage for switch time calculation (constant)

10: 02: 05

HO2S (Rear) rich-to-lean response time (calculated)

10: 21: 80

Front and HO2S (Rear) switching time ratio

Catalyst

10: 31: 83

EGR pressure variation

EGR

10: 3A: 80

EVAP system leak detection pump gross leak check

EVAP

10: 3B: 80

EVAP system leak detection pump small leak check

10: 3C: 80

*1

EVAP system leak detection pump very small leak check

10: 3D: 80

Purge flow monitor

10: A2: 0B

EWMA misfire counts for last 10 driving cycles

Misfire

10: A2: 0C

Misfire counts for last/current driving cycles

10: A3: 0B

EWMA misfire counts for last 10 driving cycles

10: A3: 0C

Misfire counts for last/current driving cycles

10: A4: 0B

EWMA misfire counts for last 10 driving cycles

10: A4: 0C

Misfire counts for last/current driving cycles

10: A5: 0B

EWMA misfire counts for last 10 driving cycles

10: A5: 0C

Misfire counts for last/current driving cycles

10: E1: 80

Heat radiation ratio

Engine cooling 

system

10: E1: 81

Misfire counts for last/current driving cycles

ON-BOARD DIAGNOSTIC [L3 WITH TC]

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

01-02–10

Revised 3/2007 (Ref. No. R051/07)

AFTER REPAIR PROCEDURE[L3 WITH TC]

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1. Connect the M-MDS to the DLC-2.
2. Cycle the ignition switch from the off to the ON 

position.

3. Any retrieved DTCs.
4. Clear all diagnostic data using the M-MDS.

End Of Sie

KOEO/KOER SELF TEST[L3 WITH TC]

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Note

• Perform a KOER self test with the engine idling after the engine speed increases to 2,000 rpm.

1. Perform the necessary vehicle preparation and visual inspection.
2. Connect the M-MDS to the vehicle DLC-2 16-pin connector located in the driver compartment.
3. Retrieve the KOEO/KOER DTCs using the M-MDS.

End Of Sie

OBD-II DRIVE MODE[L3 WITH TC]

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• Using the OBD-II drive mode, the monitoring item requested by OBD-II regulations can be easily diagnosed.

• Performing the Drive Mode inspects the OBD-II system for proper operation and must be performed to ensure 

that no additional DTCs are present.

• The OBD-II drive mode is divided into the specific drive mode and single drive mode.

• For the specific drive mode, specified drive modes have been set for each individual monitoring item requested 

by OBD-II regulations, and they can be diagnosed individually. For the single drive mode, the entire monitoring 
item requested by OBD-II regulations can be diagnosed.

• The following modes are in the specific drive mode. The applicable system is diagnosed by driving in the 

following drive modes.

— PCM Adaptive Memory Produce Drive Mode

— EGR System Repair Verification Drive Mode

— HO2S heater, HO2S, and TWC Repair Verification Drive Mode

— EVAP System Repair Verification Drive Mode

• The following systems are diagnosed with the single drive mode.

— EGR system

— Oxygen sensor (HO2S)

— Oxygen sensor heater

— Catalytic converter (TWC)

— Fuel, misfire and evaporative (EVAP) system

Caution

• While performing the Drive Mode, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another 

technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD 
function and inspect later.

Note

• Vehicle speed and engine speed detected by the PCM may differ from that indicated by the speedometer 

and tachometer. Use the M-MDS to monitor vehicle speed.

• If the OBD-II system inspection is not completed during the Drive Mode, the following causes are 

considered: 

— The OBD-II system detects the malfunction.

— The Drive Mode procedure is not completed correctly.

• Disconnecting the battery will reset the memory. Do not disconnect the battery during and after Drive 

Mode.

• The M-MDS can be used at anytime through the course of the Drive Mode to monitor the completion 

status. Monitoring can be done by viewing the ON BOARD SYSTEM READINESS menu.

• The OBD monitoring status can be confirmed with the ignition switch operation. During KOEO, the MIL 

illuminates for a fail-light inspection for approx. 17 s. The OBD monitoring status is confirmed after the 
fail-light inspection.

— If all of the diagnosis is completed even one time, the MIL will continue to illuminate.

— If all of the diagnosis is not completed, the MIL flashes for approx. 7 s, and then it illuminates until the 

engine is started.

DLC-2

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