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.6 CRANKS NORMALLY BUT WILL NOT START DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Do any of the following conditions appear? The engine does not completely start. DTC B1260 is displayed.	Yes	Both conditions appear: Go to Step 3.
1		No	Either or other condition appears: Go to the next step.
2	Does the engine stall after approx. 2 s from when it is started?	Yes	Go to the next step.
2		No	The immobilizer system is normal. Go to Step 8.
3	Are the ignition coil connectors securely connected to the coils?	Yes	Go to the next step.
3		No	Connect the coil connectors securely. Return to Step 2.
4	Does the security light illuminate?	Yes	Go to the next step.
4	Does the security light illuminate?	No	Inspect instrument cluster and the following wiring harness. Between PCM terminal 4V and instrument cluster terminal 1J Between PCM terminal 4S and instrument cluster terminal 1L
5	Connect the WDS equivalent to the DLC-2 and retrieve the DTC. Are any of the following DTCs displayed? DTC B1213, B1341, B1600, B1601, B1602, B1681, B2103, B2139, B2431, U1147, U2510	Yes	Go to the applicable DTC inspection. (See DTC TABLE (IMMOBILIZER SYSTEM) .) (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM] .)
5		No	Go to the next step.
6	Inspect the following wiring harnesses and connectors for an open or short circuit: Between coil terminal A and keyless control module terminal 3F Between coil terminal B and keyless control module terminal 3E Are there any malfunctions?	Yes	Repair or replace the wiring harnesses and connectors.
6		No	Go to the next step.
7	Inspect the following wiring harnesses and connectors for an open or short circuit: Between keyless control module terminal 3A and PCM terminal 4V Between keyless control module terminal 3B and PCM terminal 4S Are there any malfunctions?	Yes	Repair or replace wiring harnesses and connectors.
7		No	Go to the next step.
8	Verify the following: Vacuum connection External fuel shut off or accessory (such as kill switch, alarm.) Fuel quality: proper octane, contamination, winter/summer blend No air leakage from intake-air system Proper sealing of intake manifold Ignition wiring Electrical connections Fuses Smooth operation of throttle valve Are all the items normal?	Yes	Go to the next step.
8		No	Service if necessary. Repeat Step 8.
9	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 .) OR Communication error message is displayed: Inspect for the following: Open circuit between main relay and PCM terminal 5AC or 5AF Open main relay GND circuit Main relay is stuck open. Open or poor GND circuit (PCM terminal 4A, 4J, 5T, 5D, 5O or 5R) Poor connection of vehicle body GND
9		No	No DTC is displayed: Go to the next step.
10	Connect the WDS or equivalent to the DLC-2. Access the APP1 and APP2 PIDs. Crank the engine with the accelerator pedal released. Do the APP1 and APP2 PIDs indicate that the accelerator pedal is in the released position?	Yes	Go to the next step.
10		No	Inspect for the following: APP sensor Wiring harnesses and connectors between PCM APP sensor PCM terminal 4Y-APP sensor terminal D PCM terminal 5F-APP sensor terminal F PCM terminal 5AE-APP sensor terminal E PCM terminal 4X-APP sensor terminal A PCM terminal 5C-APP sensor terminal C PCM terminal 5AB-APP sensor terminal B
11	Connect the WDS or equivalent to the DLC-2. Access the TP_REL PID. Crank the engine with the accelerator pedal released. Does the TP_REL PID indicate the closed throttle position?	Yes	Go to the next step.
11		No	Inspect for the following: TP sensor Wiring harnesses and connectors between PCM and throttle body PCM terminal 1Q-throttle body terminal E PCM terminal 1J-throttle body terminal F PCM terminal 2F-throttle body terminal C PCM terminal 1M-throttle body terminal D
12	Access the ECT PID. Does the ECT PID indicate the proper engine coolant temperature? (See PCM INSPECTION .)	Yes	Go to the next step.
12		No	Inspect for the following: ECT sensor Open or short circuit between ECT sensor and PCM terminal 2K or 1U
13	Does the engine start with the throttle closed?	Yes	Go to Step 26.
13	Does the engine start with the throttle closed?	No	Go to the next step.
14	Will the engine start and run smoothly at part throttle?	Yes	Inspect the drive-by-wire control system operation. (See DRIVE-BY-WIRE CONTROL SYSTEM INSPECTION .)
14	Will the engine start and run smoothly at part throttle?	No	Go to the next step.
15	Connect the WDS or equivalent to the DLC-2. Access the RPM PID. Does the RPM PID indicate the engine speed when cranking engine?	Yes	Go to the next step.
15		No	Inspect for the following: Open or short circuit in eccentric shaft position sensor Open or short circuit between eccentric shaft position sensor and PCM terminal 2U or 2X Open or short circuit in eccentric shaft position sensor harnesses If eccentric shaft position sensor and wiring harness are normal, go to the next step.
16	Visually inspect the eccentric shaft position sensor and the teeth of the pulse wheel. Are the eccentric shaft position sensor and the teeth of the pulse wheel normal?	Yes	Go to the next step.
16		No	Replace the malfunctioning parts.
17	Inspect for cracks on the high-tension leads. Are there any cracks on the high-tension leads?	Yes	Repair the suspected high-tension leads.
17		No	Go to the next step.
18	Is a strong blue spark visible at each disconnected high-tension lead while cranking the engine?	Yes	Go to the next step.
18		No	Inspect for the following: Open or short circuit in ignition coil Open circuit in high-tension leads Open circuit between ignition coil connector GND terminal and GND Open circuit between ignition switch and ignition coil Open circuit between ignition coils terminal C and PCM terminal 2Z, 2AA, 2AC or 2AD
19	Inspect the spark plug condition. Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Inspect for fuel leakage from the injector. Spark plug is grayish white: Inspect for clogged fuel injector (FP1) (RP1).
19		No	Install spark plugs in the original positions. Go to the next step.
20	Perform the fuel pump speed control operation inspection. (See FUEL PUMP SPEED CONTROL OPERATION INSPECTION .) Does fuel pump speed control operate properly?	Yes	Go to the next step.
20		No	Repair or replace the malfunctioning parts, according to the fuel pump speed control operation inspection results.
21	Disconnect the fuel line quick release connector and install the fuel gauge to the fuel line. Short check connector terminal F/P to the body GND using a jumper wire. Turn the ignition switch to the ON position. Is the fuel line pressure correct when ignition switch is turned on/off five times ? (See FUEL LINE PRESSURE INSPECTION .)	Yes	Go to the next step.
21		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 .)
22	Visually inspect for fuel leakage at the fuel injector, O-ring and fuel line. Service if necessary. Is the fuel line pressure held after the ignition switch is turned off? (See FUEL LINE PRESSURE INSPECTION .)	Yes	Go to the next step.
22		No	Inspect the fuel injector. (See FUEL INJECTOR INSPECTION .) If the fuel injector is normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
23	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold at the quick release connector. Plug the opening end of vacuum hose. Attempt to start the engine. Is the starting condition improved?	Yes	Inspect if the purge solenoid valve sticks open mechanically. Inspect the evaporative emission control system.
23		No	Go to the next step.
24	Perform the fuel injector operation inspection. (See FUEL INJECTOR OPERATION INSPECTION .) Does the fuel injector operate properly?	Yes	Go to the next step.
24		No	Repair or replace the malfunctioning parts, according to the fuel injector operation inspection results.
25	Inspect the fuel injectors for the following: (See FUEL INJECTOR INSPECTION .) Leakage Clogging Injection amount Are injectors normal?	Yes	Go to the next step.
25		No	Replace the suspected fuel injector.
26	Inspect the engine compression. (See COMPRESSION INSPECTION .) Is it normal?	Yes	Visually inspect the exhaust system part.
26		No	Go to the next step.
27	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.
27		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) .)
28	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) .)
28		No	Go to the next step.
29	Inspect the oil pressure. (See OIL PRESSURE INSPECTION .) Is the oil pressure within the specification?	Yes	Go to the next step.
29		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) .)
30	Turn the ignition switch off. Disconnect the fuel line quick release connector and install the fuel gauge to the fuel line. NOTE: If engine won't start, inspect fuel line pressure with ignition switch ON while cranking. 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.
30		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) .)
31	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there air and/or clogging in oil pipe?	Yes	Inspect and repair for leakage and/or clogging in oil the passage at engine. After that overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
31		No	Overhaul or replace the engine. (See ENGINE REMOVAL/INSTALLATION or OVERHAUL - 1.3L (13B-MSB) .)
32	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.