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DIAGNOSTIC PROCEDURE NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE (MZI-3.7) DIAGNOSTIC PROCEDURE material. STEP INSPECTION RESULTS ACTION 1 Connect the M-MDS to the DLC-2. Yes Go to the next step. No Inspect the cooling system for cause of overheating. 2 Connect the M-MDS to the DLC-2. Yes Go to the next step. No IAT PID: Inspect IAT sensor MAF PID: Inspect MAF sensor 3 Connect the M-MDS to the DLC-2. Yes DTC is displayed: No No DTC is displayed: Go to the next step. 4 Is engine compression correct? Yes Go to the next step. No Inspect for cause. 5 Install fuel pressure gauge between Yes Inspect the ignition timing. 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. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .) 6 Inspect the knock sensor. Yes Inspect ignition timing. No Replace the knock sensor. 7 Verify test results. If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) If malfunction remains, inspect related Service Bulletins and/or On-line Repair
2008 Mazda CX-9 Grand Touring 2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
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