Mazda 3 Workshop Manual page 410

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair information
2
availability.
• Is any related repair information
available?
VERIFY RELATED PENDING CODE OR
STORED DTCS
• Turn ignition switch to off, then the ON
position (Engine off).
3
• Verify related pending code or stored
DTCs.
• Is other DTC present?
IDENTIFY TRIGGER DTC FOR FREEZE
FRAME DATA
4
• Is DTC P2178 on FREEZE FRAME
DATA?
VERIFY CURRENT INPUT SIGNAL
STATUS (KEY TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs
5 using WDS or equivalent.)
• Is there any signal that is far out of
specification when key is ON and engine
runs?
VERIFY CURRENT INPUT SIGANL
STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as Step 5 while
6 simulating FREEZE FRAME DATA
condition.
• Is there any signal which causes drastic
changes?
VERIFY CURRENT INUPUT SIGNAL
STATUS OF FRONT HO2S
• Access O2S11 for P2177 PID using WDS
or equivalent.
• Check PID under following accelerator
7
pedal condition (in NEUTRAL).
• Is PID reading normal?
- Above 0.45 V when accelerator
pedal is suddenly depressed (rich
condition).
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Yes
No Go to the next step.
Yes
No
Yes Go to the next step.
No
Yes
No Go to the next step.
Yes
No Go to the next step.
Yes Go to the next step.
No
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Perform repair or diagnosis according to the
available repair information.
• If the vehicle is not repaired, go to the next
step.
If misfire DTC is present, go to Step 8.
If other DTC is present, go to appropriate DTC
troubleshooting procedure.
(See DTC TABLE [LF].)
If drivability concern is present, go to Step 8.
If not, go to the next step.
Go to troubleshooting procedures for DTC on
FREEZE FRAME DATA.
Inspect suspected sensor and excessive
resistance in related wiring harnesses.
Repair or if necessary.
Then go to Step 15.
Inspect suspected sensor and related wiring
harnesses, repair or replace it.
Then go to Step 15.
Visually inspect for any gas leakage between
exhaust manifold and front HO2S.
Then go to Step 15.
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