Mazda 6 2002, Workshop Manual

Page: 275 / 1248

ON-BOARD DIAGNOSTIC
F–145
F
End Of Sie
DTC P0506
A6E397001087W03
Diagnostic procedure
5 INSPECT GENERATOR CONTROL CIRCUIT
MALFUNCTION
•
Apply electrical load.
•
Is engine speed increased?
Yes Go to next step.
No Repair short to power circuit in generator control circuit,
then go to Step 9.
6 INSPECT AIR CLEANER ELEMENT
•
remove air cleaner element with engine
running.
•
Is engine speed increased?
Yes Clean or replace air cleaner element, then go to Step 9.
No Go to next step.
7 INSPECT THROTTLE BODY PASSAGE
•
Is throttle body clogged?
Yes Clean or replace throttle body passage, then go to Step 9.
No Go to next step.
8 INSPECT ENGINE COMPRESSION
•
Inspect engine compression.
(See
B–9 COMPRESSION INSPECTION .)
•
Is engine compression okay?
Yes Go to next step.
No Overhaul engine, then go to next step.
9 VERIFY TROUBLESHOOTING OF DTC P0505
COMPLETED
•
Make sure to reconnect all disconnected
connectors.
•
Clear DTC using WDS or equivalent.
•
Perform KOER self-test.
(See
F–66 KOEO/KOER SELF-TEST .)
•
Is same DTC present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION .)
No Go to next step.
10 VERIFY AFTER REPAIR PROCEDURE
•
Perform “After Repair Procedure”.
(See
F–66 AFTER REPAIR PROCEDURE .)
•
Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE .)
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0506 Idle control system RPM lower than expected
DETECTION
CONDITION
•
Actual idle speed is lower than expected by 100 rpm for 14 s , when brake pedal is depressed (brake
switch is on) and steering wheel is held straight ahead (power steering pressure switch is off).
Note
•
If atmospheric pressure is less than 72.3 kPa {542 mmHg, 21.3 inHg} or intake air temperature is
below -10
°
C {14
°
F} , PCM cancels diagnosis of P0506.
Diagnostic support note
•
This is a continuous monitor (CCM).
•
MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles or in one
drive cycle while the DTC for the same malfunction has been stored in the PCM.
•
PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
•
FREEZE FRAME DATA is available.
•
DTC is stored in PCM memory.
POSSIBLE
CAUSE
•
IAC valve malfunction
•
Air cleaner element clogged
•
Air intake passage clogged
•
A/C relay control circuit malfunction
•
Generator malfunction
•
Purge solenoid valve malfunction
•
Low engine compression (Over capacity of blow-by gas)
•
PCM malfunction
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•
Has FREEZE FRAME DATA been recorded?
Yes Go to next step.
No Record FREEZE FRAME DATA on repair order, then go to
next step.
2 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
•
Check for related Service Information
availability.
•
Is any related Service Information available?
Yes Perform repair or diagnosis according to available Service
Information.
•
If vehicle is not repaired, go to next step.
No Go to next step.