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.15 EMISSION COMPLIANCE DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Inspect for the following: Vacuum lines for leakage or blockage Jet air mixing system line blockage Electrical connections Proper maintenance schedule followed Intake-air system and air cleaner element concerns: obstructions, leakage or dirtiness Are all the items normal?	Yes	Go to the next step.
1		No	Service if necessary. Repeat Step 1.
2	Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE .)
2		No	No DTC is displayed: Go to the next step.
3	Is any other driveability concern present?	Yes	Go to the applicable symptom troubleshooting. (See ENGINE SYMPTOM TROUBLESHOOTING .)
3	Is any other driveability concern present?	No	Go to the next step.
4	Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Warm up the engine and run it at idle. Verify the ECT PID is correct. (See PCM INSPECTION .) Is the ECT PID correct?	Yes	Go to the next step.
4		No	Inspect for coolant leakage, cooling fan operation or thermostat operation.
5	Is a strong blue spark visible at each disconnected high-tension lead while cranking the engine?	Yes	Inspect for the following: Spark plugs malfunction Improperly installed eccentric shaft position sensor Damaged trigger wheel 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 Repair or replace the malfunctioning parts. If normal, go to the next step.
5		No	Inspect the following: High-tension leads Ignition coil and connector
6	Disconnect the t 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.
6		No	Zero or low: 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 .)
7	Inspect for fuel saturation inside the charcoal canister. Is there an excess amount of liquid fuel present in the canister?	Yes	Replace the charcoal canister.
7		No	Inspect the fuel tank vent system. Then, go to the next step.
8	Inspect for restriction and leakage at the three-way catalytic converter. Is there any restriction or leakage at the three-way catalytic converter?	Yes	Go to the next step.
8		No	Replace the three-way catalytic converter.
9	Inspect the engine compression. (See COMPRESSION INSPECTION .) Is it normal?	Yes	Visually inspect the exhaust system part.
9		No	Go to the next step.
10	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.
10		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) .)
11	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) .)
11		No	Go to the next step.
12	Inspect the oil pressure. (See OIL PRESSURE INSPECTION .) Is the oil pressure within the specification?	Yes	Go to the next step.
12		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) .)
13	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage a the t engine. After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
13		No	Overhaul or replace engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
14	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.