Mazda CX-7 2007 Workshop Manual page 198

DTC P050A Cold start idle air control system performance
• The air into the fuel line by exchange or re-installation
• Electronic throttle control system malfunction
POSSIBLE
• Throttle valve stuck or blockage
CAUSE
• Air suction in intake air system
• PCM malfunction
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA AND
DIAGNOSTIC MONITORING TEST RESULTS
HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and
DIAGNOSTIC MONITORING TEST RESULTS
(CCM related) been recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is P050A on FREEZE FRAME DATA?
4 INSPECT FUEL SYSTEM
• Were any exchange or re-installation of fuel
system performed just before the P050A
stored?
5 CONFIRM THE PENDING CODE
• Clear the DTC from the PCM memory using
the M-MDS.
• Cool down the engine still ECT below 30 °C {86
°F}.
• Perform the cold start.
• Is the PENDING CODE for this DTC present?
6 CHECK AIR SUCTION IN INTAKE AIR SYSTEM
• Start the engine.
• Check air suction between MAF sensor and
intake manifold.
• Is there any air suction in the intake air
system?
7 VERIFY ELECTRONIC THROTTLE CONTROL
SYSTEM OPERATION
• Perform the Electronic Throttle Control System
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC],
Electronic Throttle Control System Inspection.)
• Does the electronic throttle control system
operate properly?
8 VERIFY THROTTLE VALVE
• Turn the ignition switch off.
• Remove the throttle valve with connector
connected.
• Access ETC_DSD PID using the M-MDS.
• Turn the ignition switch to ON position (Engine
off).
• Move the throttle valve using the ETC_DSD
PID simulation function.
• Dose the throttle valve move smoothly?
9 VERIFY TROUBLESHOOTING OF DTC P050A
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from the PCM memory using the M-
MDS.
• Perform the KOER self-test using the M-MDS.
(See01-02-13 DTC TABLE[L3 WITH TC].)
• Is the PENDING CODE for this DTC present?
01-02–156
2007 Mazda CX-7 Workshop Manual (1871–1U–06B)
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record the FREEZE FRAME DATA and diagnostic
monitoring test results on the repair order, then go to the
next step.
Yes Perform repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
(See01-02-13 DTC TABLE[L3 WITH TC].)
Yes Perform the air bleeding of fuel system.
• Start the engine and warm it up until engine speed is
stable then go to the next step.
No Go to Step 6.
Yes Go to the next step.
No Go to Step 9.
Yes Repair or replace malfunctioning part, then go to Step 9.
No Go to the next step.
Yes Go to the next step.
No Repair or replace malfunctioning part according to
inspection result.
Then go to Step 9.
Yes Go to the next step.
No Clean the throttle valve and retest.
If the problem does not resolve, replace the throttle body.
Then go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Revised 10/2006 (Ref. No. R144/06)
ACTION