Mazda CX-7 2007 Workshop Manual page 364

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
STEP INSPECTION
9 Connect the M-MDS to DLC-2.
Access and monitor following PIDs using the
data monitor function.
• ECT
• MAF
• IAT
• IAT2
• APP
• TP
• MAP
• VSS
• O2S11
• O2S12
• LONGFT1
• SHTFT1
Do the PIDs indicate correct values under
trouble condition?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
10 Access and monitor the FUEL_PRES PID.
Is the FUEL_PRES PID value within the
specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
11 Is vehicle accelerate performance normally?
12 Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?
13 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].)
14 Perform the spark test.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Is a strong blue spark visible at each cylinder?
15 Measure the compression pressure for each
cylinder.
(See01-10-9 COMPRESSION INSPECTION[L3
WITH TC].)
Are compression pressures within the
specification?
16 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
01-03–64
RESULTS
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].)
Yes Go to Step 14.
No Go to the next step.
Yes Go to the next step.
No Go to Step 13.
Yes Go to Step 14.
No Replace the delivery pipe.
Yes Troubleshooting is completed.
Retest Step 16.
No Go to the next step.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Inspect the fuel injector for each cylinder.
(See01-14-27 FUEL INJECTOR INSPECTION[L3
WITH TC])
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.
ACTION