Dtc P0442[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

DTC P0442[L3 WITH TC]

DTC P0442 Evaporative emission control system leak detected (small leak)
• PCM measures the pump load current (EVAP line pressure) when the specified period has passed after the
EVAP system is sealed when the monitoring conditions are met. If the load does not reach the reference
current value within the specified period, the PCM determines that the EVAP system has a small leak.
MONITORING CONDITION
— The ignition switch is turned off.
— IAT: 5— 35 °C {40— 95 °F}
— Battery voltage: 11— 20 V
— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above
— Fuel tank level: 15— 85%
DETECTION
CONDITION Diagnostic support note
• This is an intermittent monitor (Evaporative emission system).
• MIL illuminates if the PCM detects the above malfunction condition 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 the PCM detects the above malfunction condition during the first drive
cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
• DIAGNOSTIC MONITORING TEST RESULT is available.
• Purge solenoid valve malfunction
• EVAP system leak detection pump malfunction
• Charcoal canister malfunction
• Fuel filler cap malfunction
POSSIBLE
• Fuel tank malfunction
CAUSE
• Fuel pump unit poor seal
• EVAP hose damaged or loose
• EVAP pipe damaged
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA AND
DIAGNOSTIC MONITORING TEST RESULTS
HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA and
DIAGNOSTIC MONITORING TEST RESULTS
(Evaporative emission system related) been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
3 VERIFY RELATED PENDING CODE OR
STORED DTCS
• Turn the ignition switch off then to the ON
position (Engine off).
• Verify related PENDING CODE or stored
DTCs.
• Are other DTCs present?
4 CLASSIFY INTERMITTENT CONCERN OR
CONTINUOUS CONCERN
• Perform evaporative system leak inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
• Does the test result fail?
5 LOCATE LEAK POINT
• Inspect for leakage for the following using the
Evaporative Emissions Tester.
— Charcoal canister
— Catch tank
— Fuel filler cap
— EVAP hoses and pipes
— Fuel tank
• Is leakage found?
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC
MONITORING TEST RESULTS on the repair order, then
go to the next step.
Yes Perform the 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 appropriate DTC inspection.
No Go to the next step.
Yes Go to the next step.
No Intermittent concern exists. Inspect the purge solenoid
valve and the EVAP system leak detection pump circuit for
an intermittent concern.
(See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)
Yes Repair the leakage or replace the part, then go to Step 10.
No Go to the next step.
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ACTION
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01-02