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	Do the following conditions appear? The engine is not completely started Security indicator light illuminates or flashes short interval.	Yes	Both conditions appear: Go to Step 3.
1		No	Either or other condition appears: Go to the next step
2	Does engine stall after approx. 2 s from when it is started?	Yes	Go to the next step
2		No	Immobilizer system is normal. Go to Step 9.
3	Is the coil connector securely connected to the coil?	Yes	Go to the next step
3	Is the coil connector securely connected to the coil?	No	Connect the coil connector securely. Return to Step 2.
4	Does the security light flash?	Yes	Go to the next step
4	Does the security light flash?	No	Inspect the instrument cluster and wiring harness (See INSTRUMENT CLUSTER INSPECTION .)
5	Connect the M-MDS to the DLC-2 and retrieve DTC for instrument cluster and keyless control module (with advanced keyless entry and push button start system) Are any of the following DTCs displayed? DTC Instrument cluster (with advanced keyless entry and push button start system): 110214:00,110515:18,110515:92 Instrument cluster (without advanced keyless entry and push button start system): B10D5:13, B10D7:05, B10D7:51, B10D7:81, B10D7:94, B10D8:00, B10D9:87, B10DA:51, B10DA:62, U0100:87 Keyless control module (with advanced keyless entry and push button start system): B10D5:13, B10D7:05, B10D7:51, B10D7:81, B10D7:94, B10D8:00, B10D9:87, B10DA:51, B10DA:62, B10E6:11, B10E6:12, U0100:87	Yes	Go to the appropriate DTC inspection (See DTC TABLE [INSTRUMENT CLUSTER] .) (See DTC TABLE [IMMOBILIZER SYSTEM (ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM)] .)
5		No	Go to the next step.
6	Inspect the following wiring harnesses and connectors With advanced keyless entry and push button start system. Between coil terminal C and keyless control module terminal 2D Between coil terminal D and keyless control module terminal 2B Without advanced keyless entry and push button start system. Between coil terminal C and instrument cluster terminal 2G Between coil terminal D and instrument cluster terminal 2E Is there any malfunction?	Yes	Repair or replace the suspected wiring harness and connector
6		No	Go to the next step, (with advanced keyless entry system.) Go to Step 8 (without advanced keyless entry system)
7	Inspect the following wiring harnesses and connectors for an open or short circuit. Between keyless control module terminal 2G and PCM terminal 1AH Between keyless control module terminal 21 and PCM terminal 1AL Is there any malfunction?	Yes	Repair or replace wiring harness and connectors.
7		No	Go to Step 9
8	Inspect the following wiring harnesses and connectors Between PCM terminal 1AL and instrument cluster terminal 2W Between PCM terminal 1AH and instrument cluster terminal 2X Is there any malfunction?	Yes	Repair or replace the suspected wiring harness and connector.
8		No	Go to the next step
9	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 Intake-air system restriction (such as air cleaner element, fresh air duct) Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Electrical connections Fuses Smooth operation of throttle valve Are all items normal?	Yes	Go to the next step
9		No	Service if necessary Repeat Step 9
10	Connect the M-MDS to the DLC-2 Switch ignition to ON (Engine off) Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection (See DTC TABLE [MZI-3.7] .) Communication error message is displayed: Inspect for the following. Open circuit in wiring harness between main relay terminal A and PCM terminal 1BP or 1BK Open circuit in wiring harness between main relay terminal B and PCM terminal 1AZ Open or short circuit in wiring harness between the DLC-2 and PCM terminal 1AH or 1AL Main relay is stuck open. Open or poor GND circuit (PCM terminal 1B, 1J, 1E) Poor connection of vehicle body GND
10		No	No DTC is displayed: Go to the next step
11	Connect the M-MDS to the DLC-2 Access the APP1 and APP2 PIDs. Crank the engine with accelerator pedal released. Are the APP1 and APP2 PIDs indicating that the accelerator pedal is in the released position?	Yes	Go to the next step.
11		No	Inspect for the following. APP sensor Wiring harnesses and connectors for following PCM terminal 1Z-APP sensor terminal A PCM terminal 1U-APP sensor terminal B PCM terminal 1 AD-APP sensor terminal C PCM terminal 1AB-APP sensor terminal D PCM terminal 1Y-APP sensor terminal E PCM terminal 1X-APP sensor terminal F
12	Connect the M-MDS to the DLC-2 Access the TP1, TP2 PID. Crank the engine with accelerator pedal released. Are the TP1, TP2 PID indicates the closed throttle position?	Yes	Go to the next step.
12		No	Inspect for the following. TP sensor Wiring harnesses and connectors for following PCM terminal 2BO-TP sensor terminal A PCM terminal 2BR-TP sensor terminal B PCM terminal 2AL-TP sensor terminal C PCM terminal 2AP-TP sensor terminal D PCM terminal 2Z-TP sensor terminal E PCM terminal 2AN-TP sensor terminal F
13	Does the engine start with the throttle valve closed?	Yes	Go to Step 27
13	Does the engine start with the throttle valve closed?	No	Go to the next step.
14	Will the engine start and run smoothly at part throttle?	Yes	Inspect the electronic throttle control system operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .)
14	Will the engine start and run smoothly at part throttle?	No	Go to the next step.
15	Connect the M-MDS to the DLC-2 Access RPM PID Is RPM PID indicating the engine speed when cranking the engine?	Yes	Go to the next step
15		No	Inspect for the following Open or short circuit in CKP sensor Open or short circuit in wiring harness between CKP sensor terminal A and PCM terminal 2V Open or short circuit in wiring harness between CKP sensor terminal B and PCM terminal 2R Open or short circuit in CKP sensor wiring harnesses If CKP sensor and wiring harness are normal, go to the next step
16	Visually inspect the CKP sensor and teeth of crankshaft pulley Are CKP sensor and teeth of crankshaft pulley normal?	Yes	Go to the next step.
16		No	Replace the malfunctioning part
17	Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders Are wiring harness conditions normal?	Yes	Go to the next step
17		No	Repair the wiring harnesses
18	Perform the spark test (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .) Is strong blue spark visible at each cylinder?	Yes	Go to the next step
18		No	Repair or replace the malfunctioning part according to spark test result
19	Inspect the spark plug conditions Is spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Inspect for fuel leakage from injector Spark plug is grayish white: Inspect the fuel injector for clogging
19		No	Install the spark plugs on original cylinders Go to the next step
20	Visually inspect the exhaust system part. Is there any deformed exhaust system part?	Yes	Replace the suspected part
20		No	Go to the next step
21	Install the fuel pressure gauge between the fuel pipe and the fuel distributor Measure the fuel line pressure. Is fuel line pressure correct? (See FUEL LINE PRESSURE INSPECTION [MZI-3.7] .)	Yes	Go to the next step
21		No	Zero or low: Perform "Fuel Pump Operation Inspection" and "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results 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: Perform "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results If there is no malfunction, replace the fuel pump unit (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
22	Visually inspect the fuel injector O-ring and fuel line for fuel leakage Service if necessary Is the fuel line pressure held after the ignition is turned off? (See FUEL LINE PRESSURE INSPECTION [MZI-3.7] .)	Yes	Go to the next step
22		No	Inspect the fuel injector If the fuel injector is normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
23	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side Plug opening end of vacuum hose Start the engine Is starting condition improved?	Yes	Inspect if the purge solenoid valve is stuck open mechanically Inspect the evaporative emission control system
23		No	Go to the next step
24	Is air leakage felt or heard at intake-air system components while racing engine to higher speed?	Yes	Repair or replace the malfunctioning part.
24		No	Go to the next step
25	Inspect the variable valve timing control system operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .) Does variable valve timing control function properly?	Yes	Go to the next step.
25		No	Repair or replace the malfunctioning part.
26	Is the engine compression correct?	Yes	Inspect the PCV valve If normal inspect the valve timing.
26	Is the engine compression correct?	No	Inspect for causes
27	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 Information and perform repair or diagnosis If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available Retest.