Mazda CX-7 2007 Workshop Manual page 338

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
Diagnostic procedure
STEP INSPECTION
1 Connect the M-MDS to the DLC.
Access the ECT PID.
Start and warm-up engine to normal operating
temperature.
Is ECT PID reading between82— 112 °C {180—
234 °F}?
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 Inspect for leakage in intake-air system.
Is there any leakage found?
4 Perform the TP sweep inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the electronic throttle control system work
properly?
5 Connect the M-MDS to the DLC-2.
Access and monitor the following PIDs using the
data monitor function.
• ECT
• APP
• ACSW
• PSP (PCM terminal 2T)
Do the PIDs indicate the correct values under
trouble condition?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
6 Inspect the high pressure fuel pump.
(See01-14-19 HIGH PRESSURE FUEL PUMP
INSPECTION[L3 WITH TC].)
Is the high pressure fuel pump normal?
7 Inspect the fuel injector for each cylinder.
(See01-14-27 FUEL INJECTOR
INSPECTION[L3 WITH TC].)
Are fuel injectors normal?
8 Inspect the operation of cruise control system.
Does the cruise control system work properly?
9 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.
End Of Sie
01-03–38
RESULTS
Yes Go to the next step.
ECT PID is higher than 112 °C {234 °F}:
No
Go to symptom troubleshooting "NO.17 COOLING
SYSTEM CONCERNS - OVERHEATING".
ECT PID is less than 82 °C {180 °F}
Go to symptom troubleshooting "NO.18 COOLING
SYSTEM CONCERNS - RUNS COLD".
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 Repair or replace for leakage.
No Go to the next step.
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.
Yes Go to the next step.
No Inspect and repair or replace suspected parts and the
related harnesses.
If the malfunction remains, perform the intermittent
concern troubleshooting.
(See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)
Yes Go to the next step.
No Replace the high pressure fuel pump.
Yes Go to the next step.
No Replace the suspected fuel injector.
(See01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)
Yes Inspect and repair or replace the injector driver module
or related circuit.
No Repair or replace the malfunctioning part according to
inspection results.
ACTION