Mazda 6 2002, Workshop Manual

Page: 252 / 1248

ON-BOARD DIAGNOSTIC
F–123
F
15 INSPECT FUEL LINE FROM FUEL PUMP TO
FUEL DELIVERY PIPE
•
Visually inspect for fuel leakage in fuel line for
any leakage.
•
Is any fuel leakage found?
Yes Replace suspected fuel line, then go to Step 22.
No Inspect fuel filters for following:
•
Restriction or clogging at fuel filter (high-pressure side).
•
Foreign materials or stain inside fuel filter (low-pressure
side)
Perform following actions depend on the result above.
•
If restriction or clogging is found at fuel filter (high-
pressure side), replace fuel pump unit.
•
If foreign materials or stain is found inside fuel filter
(low-pressure side), clean of fuel tank and filter (low-
pressure side).
•
If all items above are okay, replace fuel pump unit.
Then, go to Step 22.
16 INSPECT ENGINE COMPRESSION
•
Inspect engine compression.
(See
B–9 COMPRESSION INSPECTION .)
•
Is it okay?
Yes Go to next step.
No Implement engine overhaul for repairs, then go to Step 22.
17 INSPECT VARIABLE VALVE TIMING CONTROL
SYSTEM OPERATION
Note
•
The following test should be performed for
variable valve timing control system. Go to
next step for vehicles without variable valve
timing control system.
•
Inspect variable valve timing control system
operation.
•
Does variable valve timing control system?
Yes Go to next step.
No Repair or replace malfunctioning part according to variable
valve timing control system inspection results, then go to
Step 22.
18 INSPECT OPERATION OF PURGE CONTROL
SOLENOID VALVE
•
Turn ignition key to OFF.
•
Connect vacuum pump to purge control
solenoid valve and apply vacuum to solenoid.
•
Verify that solenoid holds vacuum.
•
Turn ignition key to ON (Engine OFF).
•
Access EVAPCP PID in SIMULATION TEST
using WDS or equivalent.
•
Set duty value to 100% for EVAPCP PID.
•
Apply vacuum while turning solenoid from OFF
to ON and simulating EVAPCP PID with
100%
duty value.
•
Verify that solenoid releases vacuum while
solenoid is turned ON.
•
Is purge control solenoid valve operation okay?
Yes Go to next step.
No Replace purge control solenoid valve, then go to Step 22.
19 INSPECT PCV VALVE OPERATION
•
Turn ignition key to OFF.
•
Remove PCV valve and inspect valve
operation.
(See
F–41 PCV VALVE INSPECTION .)
•
Is PCV valve operation okay?
Yes Replace PCV valve, then go to Step 22.
No Go to next step.
20 INSPECT OPERATION OF EGR VALVE
•
Remove EGR valve.
•
Visually inspect for stuck to open.
•
Does EGR valve stuck to open?
Yes Repair or replace EGR valve, then go to Step 22.
No Go to next step.
STEP INSPECTION ACTION