Diagnostic procedure
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | Connect the M-MDS to the DLC-2. Access the ECT PID. Verify ECT PID is less than 116°C {241°F} during driving. Is the ECT PID less than the specification? |
Yes | Go to the next step. |
| No | Inspect the cooling system for the cause of the overheating. | ||
| 2 | Connect the M-MDS to the DLC-2. Access the IAT and MAF PIDs. Monitor each PID. (See PCM INSPECTION [L5] .) Are the PIDs normal? |
Yes | Go to the next step. |
| No | IAT PID:
Inspect IAT sensor MAF PID: Inspect MAF sensor |
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| 3 | Connect the M-MDS to the DLC-2. Switch the ignition to ON (Engine off). Are there any DTCs displayed? |
Yes | DTC is displayed: Go to the appropriate DTC inspection (See DTC TABLE [L5] .) |
| No | No DTC is displayed: Go to the next step. |
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| 4 | Is the engine compression correct? (See COMPRESSION INSPECTION [L5] .) |
Yes | Go to the next step. |
| No | Inspect for cause | ||
| 5 | Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L5] .) Is the fuel line pressure correct? |
Yes | Inspect the ignition timing (See ENGINE TUNE-UP [L5] .) |
| No | Low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging If there is no malfunction, replace the fuel pump unit. High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5] .) |
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| 6 | Inspect the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [L5] .) Is the knock sensor normal? |
Yes | Inspect ignition timing. (See ENGINE TUNE-UP [L5] .) |
| No | Replace the KS (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [L5] .) |
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| 7 |
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