Mazda CX-7 2007 Workshop Manual page 335

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
Diagnostic procedure
STEP INSPECTION
1 Inspect for the following:
• Fuel quality (proper octane, contamination,
winter/summer blend)
• Intake-air system restriction or leakage
• Electrical connectors connection
• Fuel leakage in fuel system
• Vacuum leakage
Are all items normal?
2 Perform the self-test function using the M-MDS.
Turn the ignition switch to the ON position.
Retrieve any DTCs.
Is a DTC displayed?
3 Access the ECT PID.
Verify that the ECT PID isless than 116°C
{241°F} during driving.
Is the ECT PID less than specified?
4 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?
5 Perform the EGR system operation inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the EGR system operate properly?
6 Perform the TP sweep inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the electronic throttle control system work
properly?
7 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?
8 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?
9 Inspect 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?
RESULTS
Yes Go to the next step.
No Service if necessary.
Repeat Step 1.
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.
Yes Go to the next step.
No The cause of this concern could be from the 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].)
Yes Go to the next step.
No Repair or replace the malfunctioning parts according to
inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Visually inspect the throttle body (damaged/
scratching.) If normal, go to the next step.
No Inspect or replace the malfunctioning parts, according
the to inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Repair or replace the malfunctioning part according to
the inspection results.
No Go to the next step.
ACTION
01-03–35
01-03