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 the engine stall after approx. 2 s since the engine is started?	Yes	Go to the next step.
2		No	Immobilizer system is normal. Go to Step 9.
3	Is coil connector securely connected to coil?	Yes	Go to the next step
3	Is coil connector securely connected to 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 and repair or replace the following: With advanced keyless entry and push button start system: Wiring harnesses and connectors from keyless control module terminal 21 and instrument cluster terminal 2W Wiring harness and connectors from keyless control module terminal 2G and instrument cluster terminal 2X Instrument cluster (See INSTRUMENT CLUSTER INSPECTION .) Without advanced keyless entry and push button start system: Instrument cluster (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 system and push button start system): U0214:00, U0515:18, U0515:92 Instrument cluster (without advanced keyless entry and push button start system): B10D9:87, B10D5:13, B10D7:05, B10D7:94, B10D7:81, B10D7:51, U0100:87, B10D8:00, B10DA:51, B10DA:62 Keyless control module (with advanced keyless entry and push button start system): B10D9:87, B10D5:13, B10D7:05, B10D7:94, B10D7:81, B10D7:51, U0100:87, B10D8:00, 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 for 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 and push button start system.) Go to Step 8. (without advanced keyless entry and push button start system.)
7	Inspect the following wiring harnesses and connectors: 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 for 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 wiring harness and connector.
8		No	Go to the next step.
9	Verify the following: Vacuum connection Air cleaner element No air leakage from intake-air system No restriction of intake-air system Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Fuel quality: proper octane, contamination, winter/summer blend Electrical connections 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. 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.
10		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 1AD-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
11	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.
11		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
12	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 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 C and PCM terminal 1BP or 1BK Open circuit in wiring harness between main relay terminal B and PCM terminal 1AZ Main relay is stuck open. Open or short circuit in wiring harness between the DLC-2 and PCM terminals 1AH or 1AL Open or poor ground circuit (PCM terminal 1B, U, 1E) Poor connection of vehicle body ground
12		No	No DTC is displayed: Go to the next step.
13	Attempt to start engine at part throttle. Does engine run smoothly at part throttle?	Yes	Inspect electronic throttle control system operation. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .)
13		No	Go to the next step.
14	Connect the M-MDS to the DLC-2. Access RPM PID. Is RPM PID indicating engine speed during engine cranking?	Yes	Go to the next step.
14		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.
15	Visually inspect CKP sensor and teeth of crankshaft pulley. Are CKP sensor and teeth of crankshaft pulley normal?	Yes	Go to the next step.
15		No	Replace the malfunctioning part.
16	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.
16		No	Repair the wiring harnesses.
17	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. If symptoms occurs with the A/C on, go to Step 23
17		No	Repair or replace the malfunctioning part according to spark test result.
18	Inspect the spark plug condition. 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
18		No	Install spark plugs on original cylinders. Go to the next step.
19	Remove and shake the PCV valve Does the PCV valve rattle?	Yes	Go to the next step
19	Remove and shake the PCV valve Does the PCV valve rattle?	No	Replace the PCV valve.
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: 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] .)
22	Visually inspect for fuel leakage at fuel injector O-ring and fuel line. Service if necessary. Is fuel line pressure held after 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	NOTE: The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect pressure gauges to A/C low and high pressure side lines. Turn A/C on and measure low side and high side pressures. Are pressures within specifications? (See REFRIGERANT PRESSURE CHECK .)	Yes	Go to the next step.
23		No	If A/C is always on, go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously" (See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] .) For other symptoms, inspect the following. Refrigerant charging amount Condenser fan operation
24	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid side. Plug opening end of vacuum hose. Start the engine. Is the engine stall now eliminated?	Yes	Inspect if purge solenoid valve is stuck open. Inspect evaporative emission control system.
24		No	Go to the next step.
25	Is air leakage felt or heard at intake-air system components while racing the engine to higher speed?	Yes	Repair or replace the malfunctioning part.
25		No	Go to the next step
26	Inspect 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.
26		No	Repair or replace the malfunctioning parts according to variable valve timing control system operation inspection results.
27	Is the engine compression correct?	Yes	Inspect the valve timing.
27	Is the engine compression correct?	No	Inspect for cause.
28	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