Dtc P050B[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

STEP
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the AFTER REPAIR PROCEDURE.
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTC present?
End Of Sie

DTC P050B[L3 WITH TC]

DTC P050B Cold start ignition timing performance
• The PCM monitors actual ignition timing using the CKP sensor while electronic spark advance control fast
idle correction operating. If the ignition timing is out of specified range, the PCM determines that the ignition
timing at cold condition has performance problem.
Diagnostic support note
• This is a continuous monitor (CCM).
DETECTION
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or
CONDITION
in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive
cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
• The air into the fuel line by exchange or re-installation
• Damaged CKP sensor
• Damaged CMP sensor
POSSIBLE
• Damaged or chipped CKP sensor pulse wheel
CAUSE
• Damaged or chipped CMP sensor pulse wheel
• 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 P050B on FREEZE FRAME DATA?
4 INSPECT FUEL SYSTEM
• Were any exchange or re-installation of fuel
system performed just before the P050B
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 VISUALLY INSPECT CKP SENSOR AND PULSE
WHEEL
• Visually inspect for CKP sensor and pulse
wheel.
• Is there any damage or chip on CKP sensor
and pulse wheel?
7 INSPECT CKP SENSOR
• Inspect CKP sensor.
(See01-40-43 CRANKSHAFT POSITION
(CKP) SENSOR INSPECTION[L3 WITH TC].)
• Is the CKP sensor normal?
Revised 10/2006 (Ref. No. R144/06)
2007 Mazda CX-7 Workshop Manual (1871–1U–06B)
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
INSPECTION
Yes Go to the applicable DTC troubleshooting.(See01-02-13
DTC TABLE[L3 WITH TC].)
No Go to the next step.
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 10.
Yes Replace the suspected part, then go to Step 10.
No Go to the next step.
Yes Go to the next step.
No Replace the CKP sensor, then go to Step 10.
ACTION
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ACTION
01-02–157
01-02