Mazda CX 7. Manual - part 82

 

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Mazda CX 7. Manual - part 82

 

 

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–25

01-03

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

Revised 10/2006 (Ref. No. R144/06) 

13

Turn the ignition switch to the ON position. 
(Engine off.)
Measure the voltage between keyless CM 
harness-side connector terminal 2A, 2C, 2D and 
body ground.
Is the voltage B+?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

14

Inspect the following wiring harnesses and 
connectors.

• Between keyless CM terminal 3W and PCM 

1AI

• Between keyless CM terminal 3X and PCM 

1AM

Is there any malfunction (open or short circuit, 
terminal corrosion, etc.)?

Yes

Repair or replace malfunctioning part.

No

Go to the next step.

15

Turn the ignition switch off.
Disconnect the coil connector.
Turn the ignition switch to the ON position. 
(Engine off.)
Measure the voltage between coil harness-side 
connector terminal D and body ground.
Is the voltage B+?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

16

Inspect for the following:

• Fuel quality (proper octane, contamination, 

winter/summer blend)

• Intake-air system leakage and restriction

• Electrical connectors

• Poor connection for PCM ground and body 

ground

• Fuel leakage

• Vacuum leakage

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.
Repeat Step 16.

17

Perform the self-test function using M-MDS.
Turn the ignition switch to the ON position.
Retrieve any DTCs.
Is the DTC displayed?

Yes

DTC is displayed:
Go to the appropriate DTC test.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

No DTC is displayed:
Go to the next step.

18

Access the ECT PID using the M-MDS.
Verify that the ECT PID is less than 116 

°C {241 

°F} during driving.
Is the ECT PID less than specified?

Yes

Go to the next step.

No

The cause of this concern could from be cooling 
system overheating.
Perform the symptom troubleshooting “NO.17 
COOLING SYSTEM CONCERNS - OVERHEATING.”
(See01-03-60 NO.17 COOLING SYSTEM 
CONCERNS-OVERHEATING[L3 WITH TC].)

19

Access the VPWR PID.
Turn the ignition switch to the ON position. 
(Engine off)
Does the VPWR PID indicateB+?

Yes

Go to the next step.

No

Repair or replace the wiring harness between main 
relay terminal D and PCM terminal 1BE and 2E.

20

Perform the A/C Cut-off Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the A/C Cut-off Operation work properly?

Yes

Go to the next step.

No

Repair or replace malfunctioning parts according to the 
inspection results.

21

Will the engine run smoothly at part throttle?

Yes

Go to the next step.

No

Go to Step 23.

22

Perform the TP sweep inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the electronic throttle control system work 
properly?

Yes

Visually inspect the throttle body (damaged/
scratching.)
If normal, go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

23

Perform the EGR system operation inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does EGR system operate properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

24

Perform the Purge Control System Operation 
inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the purge solenoid valve work properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

STEP

INSPECTION

RESULTS

ACTION

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–26

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

25

Perform the Variable Valve Timing Control 
System Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the variable valve timing control system 
work properly?

Yes

Inspect the valve timing.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

26

Inspect the CMP and CKP sensor for the 
following;

• Installation condition

(See01-40-45 CAMSHAFT POSITION 
(CMP) SENSOR REMOVAL/
INSTALLATION[L3 WITH TC].)
(See01-40-42 CRANKSHAFT POSITION 
(CKP) SENSOR REMOVAL/
INSTALLATION[L3 WITH TC].)

• Damaged trigger wheel and camshaft

• Open or short circuit in the wiring harnesses

Is there any malfunction detected?

Yes

Repair or replace the malfunctioning part according 
inspection results.

No

Go to the next step.

27

Access and monitor the following PIDs using the 
data monitor function.

• ECT

• APP

• MAF

• O2S11

• O2S12

• LONGFT1

• SHTFT1

Do the PIDs indicate the correct values under 
the malfunction condition?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Go to the next step.

No

Inspect and repair or replace suspected parts and 
related harnesses.
If the malfunction remains, perform the intermittent 
concern troubleshooting procedure.
(See01-03-76 INTERMITTENT CONCERN 
TROUBLESHOOTING[L3 WITH TC].)

28

Remove and shake the PCV valve. Does the 
PCV valve rattle?

Yes

Go to the next step.

No

Replace the PCV valve.

29

Inspect for restriction in the exhaust system and 
Three-way catalytic converter (TWC).
Is there any restriction?

Yes

Replace malfunctioning part.

No

Go to the next step.

30

Perform the spark test.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

31

Access and monitor the FUEL_PRES PID. Is the 
FUEL_PRES PID value within the specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Go to Step 35.

No

Go to the next step.

32

Is the vehicle accelerate performance normally?

Yes

Go to the next step.

No

Go to Step 34.

33

Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR 
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?

Yes

Go to Step 35.

No

Replace the delivery pipe.

34

Replace the high pressure fuel pump.
Monitor FUEL_PRES PID.
Is the FUEL_PRES PID value within the 
specified?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Troubleshooting is completed.
Go to Step 38.

No

Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR 
INSPECTION[L3 WITH TC].)

35

Connect the fuel pressure gauge between the 
fuel pump and the high pressure fuel pump.
Measure the fuel pressure line of the low 
pressure side.
(See01-14-5 FUEL LINE PRESSURE 
INSPECTION[L3 WITH TC].)
Is the fuel pressure within the specification?

Yes

Go to the next step.

No

Inspect for the following:

• Fuel line restriction

• Fuel filter clogging

If normal, replace the fuel pump.

36

Inspect the fuel injector for each cylinder.
(See01-14-27 FUEL INJECTOR 
INSPECTION[L3 WITH TC].)
Are the fuel injectors normal?

Yes

Go to the next step.

No

Replace the suspected fuel injector.
(See01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

STEP

INSPECTION

RESULTS

ACTION

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–27

01-03

End Of Sie

37

Measure the compression pressure for each 
cylinder.
(See01-10-9 COMPRESSION INSPECTION[L3 
WITH TC].)
Are the compression pressures within the 
specification?

Yes

Replace the injector driver module.
If the problem remains, overhaul the engine.

No

Inspect for the following:

• Damaged valve seat

• Worn valve stem and valve guide

• Worn or stuck piston ring

• Worn piston, piston ring or cylinder

• Improper valve timing

Service if necessary.

38

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the 

repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later 

calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

1871-1U-06B(01-03).fm  27 ページ  2006年3月15日 水曜日 午前10時36分

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–28

NO.6 CRANKS NORMALLY BUT WILL NOT START[L3 WITH TC]

id010339801200

6

CRANKS NORMALLY BUT NOT START

DESCRIPTION

• Starter cranks engine at normal speed but engine will not run.

• Refer to symptom troubleshooting “No.5 Engine stalls” if this symptom appears after the engine stalls.

• Fuel is in tank.

• Battery is in normal condition.

POSSIBLE CAUSE

• Air leakage from intake-air system

• Open PCM ground or vehicle body ground

• Improper operation of electronic throttle control system

• EGR valve malfunction

• Low engine compression

• Engine overheating

• Vacuum leakage

• Ignition system malfunction

• Poor fuel quality

• PCV valve malfunction

• Intake-air system restriction

• Improper air/fuel mixture ratio control

• No signal from CKP sensor due to sensor, related wire or incorrect installation

• No signal from CMP sensor due to sensor, related wire or incorrect installation

• Front and/or rear HO2S sensor or related circuit malfunction

• ECT sensor or related circuit malfunction

• Accelerator position sensor or related circuit malfunction

• MAF sensor or related circuit malfunction

• High pressure fuel pump malfunction

• Exhaust system or three-way catalytic converter (TWC) malfunction

• Disconnected electrical connector

• Open or short in fuel pump (low-side) body and related harness

• Inadequate fuel pressure (high or low pressure side)

• Fuel pressure sensor or related circuit malfunction

• Relief valve malfunction (built-in high pressure fuel pump)

• Fuel line clogging or restriction

• Incorrect fuel injection timing

• Fuel pump resistor or control relay malfunction

• Fuel pump (low-side) mechanical malfunction

• Fuel leakage

• Fuel injector malfunction

• Purge solenoid valve malfunction

• Spark plug malfunction

• Ignition coil malfunction

• Improper valve timing

• Improper variable valve timing control system operation

• Immobilizer system or related circuit malfunction

Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair 
procedures. Read the following warnings before performing the fuel system services:

• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always 

keep sparks and flames away from fuel.

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or 

death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete 
“BEFORE REPAIR ROCEDURE” and “AFTER REPAIR PROCEDURE” described in this 
manual.
 (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
 (See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly 

cause damage to the fuel pipe and quick release connector. Always clean the quick release 
connector joint area before disconnecting/connecting, and make sure that it is free of 
foreign material.

1871-1U-06B(01-03).fm  28 ページ  2006年3月15日 水曜日 午前10時36分

 

 

 

 

 

 

 

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