Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Inspect air suction between the MAF sensor and intake-port. Is there any air suction?	Yes	Repair or replace the air suction at the intake-air system.
1		No	Go to the next step.
2	Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Verify that the 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.
2		No	Inspect the cooling system for the cause of overheating.
3	Connect the WDS or equivalent to the DLC-2. Access the IAT and the MAF PIDs. Monitor each PID. (See PCM INSPECTION .) Are PIDs normal?	Yes	Go to the next step.
3		No	IAT PID: Inspect IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .) MAF PID: Inspect MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .)
4	Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Are there any DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE .)
4		No	No DTC is displayed: Go to the next step.
5	Perform the fuel pump speed control operation inspection. (See FUEL PUMP SPEED CONTROL OPERATION INSPECTION .) Does the fuel pump speed control operate properly?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning parts, according to the fuel pump speed control operation inspection results.
6	Is the strong blue spark visible at each disconnected high-tension lead while cranking the engine?	Yes	Inspect for the following: Spark plugs malfunction Spark plugs heat range Pulse wheel damaged on eccentric shaft Open or short circuit on eccentric shaft position sensor Open or short circuit between eccentric shaft position sensor and PCM terminal 2U or 2X If they are normal, go to the next step.
6		No	Inspect for the following: High-tension leads Ignition coils or connectors
7	Inspect the knock sensor. (See KNOCK SENSOR (KS) INSPECTION .) Is the knock sensor normal?	Yes	Go to the next step.
7		No	Replace the knock sensor. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
8	Inspect the engine compression. (See COMPRESSION INSPECTION .) Is it normal?	Yes	Go to Step 14.
8		No	Go to the next step.
9	Perform the metering oil pump control inspection. (See METERING OIL PUMP CONTROL INSPECTION .) Does the metering oil pump control operate properly?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
10	Check the engine oil condition. Is the engine oil low viscosity and/or is there a gasoline odor?	Yes	Replace the engine oil. Inspect the ECT sensor and the related wiring harnesses. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .) After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
10		No	Go to the next step.
11	Inspect the oil pressure. (See OIL PRESSURE INSPECTION .) Is the oil pressure within the specification?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
12	Turn the ignition switch off. Disconnect the fuel line quick release connector and install the fuel gauge to the fuel line. Start the engine and run it at idle. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION .)	Yes	Go to the next step.
12		No	Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
13	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there any air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at the engine. After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
13		No	Overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
14	Disconnect the fuel line quick release connector and install the fuel gauge to the fuel line. Start the engine and run it at idle. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION .)	Yes	Go to the next step.
14		No	Zero or low: Inspect the fuel pump relay and the fuel pump circuit. Inspect for clogged fuel line. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
15	Inspect the fuel injectors for the following: (See FUEL INJECTOR INSPECTION .) Clogging Injection amount Are the injectors normal?	Yes	Go to the next step.
15		No	Replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
16	Inspect the knock sensor. (See KNOCK SENSOR (KS) INSPECTION .) Is the knock sensor normal?	Yes	Go to the next step.
16		No	Replace the knock sensor. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
17	Inspect the ignition timing. (See IGNITION TIMING INSPECTION .) Does the ignition timing operate properly?	Yes	Inspect the eccentric bypass valve operation and carbon build-up in the combustion chamber. (See ECCENTRIC SHAFT BYPASS VALVE .)
17		No	Repair or replace the malfunctioning parts, according to the ignition timing inspection results.
18	Verify test results. If normal, return to the diagnostic index to service any additional symptoms. If the malfunction remains, inspect the related Service Bulletins and/or the On-line Repair Information and perform the repair or diagnosis.