Symptom Troubleshooting [Engine Control System (13B-MSP)]: Diagnosis Mazda RX-8 I

Inspection Method For Sensors

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off). NOTE: If the engine starts and runs, perform the following steps at idle.
3. Access the PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger. If the PID value is unstable or malfunction occurs, check for poor connection or poorly mounted sensor or both.

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1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off). NOTE: If the engine starts and runs, perform the following steps at idle.
3. Prepare the output state control function for actuators or relays that you are inspecting.
4. Vibrate the actuator or relay with your finger for 3 s after output state control function is activated. If a variable click sound is heard, check for poor connection or poorly mounted actuator or both, or the relay. NOTE: Moving the relays too strongly may result in open relays.

ENGINE SYMPTOM TROUBLESHOOTING

1. Confirm trouble symptom using the following diagnostic index, then go to the applicable troubleshooting chart.

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Intake Manifold Vacuum Inspection

1. Verify air intake hoses are installed properly.
2. Start the engine and run it at idle.
3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake manifold side.
4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum. If not as specified, inspect the following: Air suction at throttle body and intake manifold installation points Fuel injector insulator Engine compression

Specification

MT: -66.7-56.0 kPa {-500.24-420.1 mm Hg, -19.6-16.6 in Hg}

AT: -67.3-53.4kPa {-504.7-400.6 mm Hg, -19.8-15.8 in Hg}

Note. Air suction can be located by engine speed change when lubricant is sprayed on the area where suction is occurring.

Engine Coolant Temperature Compensation Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Select the following PIDs: ECT IAT RPM
3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up. If the engine speed does not decrease or decreases slowly, inspect the following: ECT sensor and related wiring harness (See «DTC P0117»(ref-178174-S24445491332005061300000) and «DTC P0118»(ref-178174-S00806811462005061300000) .) Throttle body and related wiring harness (See THROTTLE BODY INSPECTION .)

Load Compensation Inspection

1. Start the engine and run it at idle.
2. Connect the WDS or equivalent to the DLC-2.
3. Verify that P0506 or P0507 is not displayed. If P0506 or P0507 are displayed, perform DTC inspection (See DTC TABLES .)
4. Select the RPM PID. NOTE: Excludes temporary idle speed drop just after the loads are turned on.
5. Verify that the engine speed is within the specification under each load condition. If load condition is not as specified, inspect the following: A/C switch and related wiring harness (See «CLIMATE CONTROL UNIT INSPECTION»(ref-178308-S41017778452005061400000) .) Fan switch and related wiring harness (See «CLIMATE CONTROL UNIT INSPECTION»(ref-178308-S41017778452005061400000) .) CAN signal and related wiring harness (P/S operation signal)

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Throttle Position (TP) Sweep Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Verify that none of the following DTC are displayed: P0122, P0123, P0222, P0223, P2101, P2106, P2107, P2108, P2109, P2112, P2119, P2122, P2123, P2127, P2128, P2135, P2136, P2138 If any one DTC is displayed, perform DTC inspection.
4. Access the TP_REL PID.
5. Verify that the PID reading is within the CTP value. (See «ON-BOARD DIAGNOSTIC (MULTIPLEX COMMUNICATION)»(ref-178297) .) If the PID reading is out of range, perform the following: Remove the air duct from throttle valve body. Verify that the throttle valve opens when accelerator pedal is depressed. If the throttle valve opens, inspect the throttle position sensor and the related wiring harness. If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring harness.
6. Gradually depress the throttle pedal and verify that the PID reading increases lineally. If the PID reading drops momentarily, inspect the following: Throttle position sensor
7. Fully depress the throttle pedal and verify that the PID reading is within the WOT value. (See «ON-BOARD DIAGNOSTIC (MULTIPLEX COMMUNICATION)»(ref-178297) .) If the PID reading is out of range, perform the following: Remove the air duct from throttle valve body. Verify that the throttle valve opens when throttle pedal is depressed. If the throttle valve opens, inspect the throttle position sensor and the related wiring harness. If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring harness.

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1. Connect the WDS or equivalent to the DLC-2.
2. Access the RPM PID.
3. Start the engine.
4. Inspect the rod operation under the following condition: Rod operation

1. If the rod operation is not as specified, inspect as follows: Stop the engine. Connect the WDS or equivalent to the DLC-2. Verify that DTC P0076 or P0077 is not displayed. If DTC P0076 or P0077 is shown, perform DTC inspection. (See DTC TABLES .) Inspect the VDI solenoid valve. (See VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) SOLENOID VALVE INSPECTION .) If the VDI solenoid valve is not normal, replace the VDI solenoid valve. If the VDI solenoid valve is normal, inspect the following: Vacuum hose and vacuum chamber for looseness or damage Shutter valve actuator (See VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) ACTUATOR INSPECTION .) Shutter valve stuck open or closed

Auxiliary Port Valve (APV) Control Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Verify DTC P2004, P2006, P2008 or P2017 is not displayed. If DTC P2004, P2006, P2008 or P2017 are displayed, perform DTC inspection. (See DTC TABLES .)
3. Access the ECT and RPM PIDs.
4. Start the engine and warm-up it above the ECT PID 70 °C {158 °F}.
5. Verify that PCM terminal 3B voltage is 1.5 V or more during idle and decreases to less than 1.5 V when the engine speed is increased.
6. If not as specified, proceed to next step.
7. Inspect and repair or replace the following wiring harnesses and connectors for an open or short circuit. APV motor terminal A-PCM terminal 3B APV motor terminal B-PCM terminal 3J APV motor terminal D-PCM terminal 3G
8. Remove APV motor and APV.
9. Inspect for the following: APV motor (See AUXILIARY PORT VALVE (APV) MOTOR INSPECTION (13B-MSP (HIGH POWER)) .) APV (stuck open or closed)

Fuel Pump Control System Inspection

1. Crank the engine and verify that the fuel pump relay operation sound is heard.
2. If the operation sound is not heard, inspect the following: Fuel pump relay Wiring harness and connectors (Main relay-fuel pump relay-PCM terminal 5P)

Secondary Air Injection (AIR) System Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Verify that DTC P2257, P2258, P2259 or P2260 is not displayed. If DTC P2257, P2258, P2259 or P2260 are displayed, perform DTC inspection. (See DTC TABLES .)
3. Access the ECT PID.
4. Start the engine and warm it up to the normal operating temperature.
5. Cool down the engine to that the ECT PID is 30°C {86°F} or less .
6. Turn the ignition switch to the ON position.
7. Verify that the PCM terminal 10 voltage is B+ and the AIR pump is not operating. If the PCM terminal 10 voltage is not B+, inspect and repair or replace open or short circuit between PCM terminal 10 and AIR solenoid valve connector B. If the AIR pump is operating inspect for the following: AIR pump relay (stuck closed) Wiring harnesses and connectors (Main relay terminal C-AIR pump relay-PCM terminal 40/AIR PUMP fuse-AIR pump relay-AIR pump)
8. Start the engine.
9. Verify that the AIR pump is operating and the PCM terminal 10 voltage is 0 V after the engine is started. If the AIR pump does not operate, inspect for the following: AIR pump relay (stuck open) AIR pump (internal malfunction) Wiring harnesses and connectors (Main relay terminal C-AIR pump relay-PCM terminal 40/AIR PUMP fuse-AIR pump relay-AIR pump-GND) If PCM terminal 10 voltage is not 0 V , inspect and repair or replace open or short circuit between PCM terminal 10 and AIR solenoid valve connector B. If the AIR pump operates and PCM terminal 10 is 0 V , inspect for the following: AIR pump (pressure) AIR solenoid valve (stuck or closed) Vacuum hose (Intake manifold-vacuum tank-AIR solenoid valve-AIR control valve) Secondary air passage (AIR pump-AIR control valve-exhaust manifold)

Metering Oil Pump Control Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Verify that DTC P1686, P1687, or P1688 is not displayed. If DTC P1686, P1687, P1688 are displayed, perform DTC inspection. (See DTC TABLES .)
3. Verify that the metering oil pump motor coil resistance is as specified. (See METERING OIL PUMP RESISTANCE INSPECTION .)
4. Verify that there is continuity between the metering oil position switch terminal A and C.
5. Measure the voltage of PCM terminal 2N at idle. Specification 0 V If not as specified, inspect for the following wiring harnesses and connectors: Between PCM terminal 2N and metering oil pump position switch terminal A Between PCM terminal 1U and metering oil pump position switch terminal C
6. Inspect for the following and repair or replace according to inspection results. Oil pipe (leakage or crack between metering oil pump and oil nozzle) Oil nozzle Air bleed hose (leakage, clogged, damage or poor connection)

Purge Control System Inspection

1. Start the engine.
2. Disconnect the vacuum hose at quick release connector.
3. Put a finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold. If there is vacuum, inspect the following: Wiring harness and connectors (Purge solenoid valve-PCM terminal 2P) Purge solenoid valve
4. Warm up the engine to the normal operating temperature.
5. Stop the engine.
6. Connect the WDS or equivalent to the DLC-2 and verify that the DTC P0443 is shown. Perform the DTC inspection. (See DTC TABLES .)
7. Turn the ignition switch to the ON position.
8. Select the ECT PID.
9. Verify that the engine is warmed up completely. If the engine is not warmed up completely, perform the ECT sensor inspection.
10. Set the vehicle on the dynamometer or chassis roller. WARNING: When the dynamometer or chassis roller is operating, there is a possibility that the operator may come into contact with or be caught up in the rotating parts, leading to serious injuries or death. When performing work while the dynamometer or chassis roller is operating, be careful not to come into contact with or be caught up in any of the rotating parts.
11. Drive the vehicle at an engine speed of approx. 2000 RPM for 30 s or more .
12. Put a finger to the purge solenoid valve and verify that there is no vacuum applied during above step 2 . If there in no vacuum, inspect the following: Wiring harness and connector (Main relay - purge solenoid valve-PCM terminal 2P) Purge solenoid valve MAF, APP1, APP2, TP_REL and LOAD PIDs If there is vacuum, inspect the following: Vacuum hose (Purge solenoid valve-charcoal canister)

A/C Cut-off Control System Inspection

1. Start the engine.
2. Turn the A/C switch and fan switch on.
3. Verify that the A/C compressor magnetic clutch actuates. If it does not actuate, go to the symptom troubleshooting "No. 23 A/C does not work sufficiently". (See «No. 23 A/C DOES NOT WORK SUFFICIENTLY»(ref-178317-S11944097472005061400000) .)
4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-5 s . If it actuates, inspect as follows: A/C relay Open or short to GND circuit in wiring harness and connectors (Ignitions switch-A/C relay-PCM terminal 5AA) A/C related parts APP1, APP2 PIDs

Evaporative System Test Outline

1. To verify that the problem has been fixed properly after repairs, the run Drive Cycle or evaporative system test must be performed.

Evaporative system leak inspection using leak tester

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1. Perform the following SST (Evaporative Emission System Tester MZ254AT3641) self-test: NOTE: If the tester does not work correctly during the self-test, refer to the tester operators manual for more detailed self test procedures. Verify that the gas cylinder valve is closed and the control valve located on the tester is in the TEST position. All tester displays should be off at this time. Connect the long hose (part of SST ) to the tester. Connect the manifold assembly (part of SST ) to the long hose as shown. Open the gas cylinder valve and verify the gas cylinder regulator left gauge reads 69.0 to 82.6 kPa {0.71 to 0.84 kgf/cm 2 , 10 to 12 psi} (preset at factory). If not, refer to the tester operators manual to contact tester manufacturer. Press the ON/OFF switch to turn on the SST and make sure the left display reads 0.0 . Turn the control valve on the tester to the FILL position. Verify the left display reading is within 35.4 to 35.5 cm {13.9 to 14.0 in} of water. If not, adjust the pressure using the regulator knob located on the right side of the tester. Turn the control valve to TEST position and press the START switch. After the 2-min countdown (left display) is completed, the right display shows the total pressure loss for that period. A 0.2 cm {0.5 in} of water loss is acceptable on the self-test. If the loss is 0.2 cm {0.5 in} or more of water, do one or more self-tests. If the test repeatedly fails, check for leaks using the ultrasonic leak detector (part of SST ).
2. Press the RESET switch to set the left display reading to 0.0 .
3. Connect the fuel cap test adapter (part of SST ) to the manifold assembly and fuel-filler cap from the vehicle. If the fuel-filler cap is not a genuine part, replace it.
4. Connect the threaded test adapter (part of SST ) to the manifold assembly and fuel-filler neck.
5. Connect the WDS or equivalent to the DLC-2.
6. Turn the ignition switch to the ON position (Engine off).
7. Request the PCM for on-board device control (Mode 08) using the WDS or equivalent to close the change-over valve (COV) in the EVAP system leak detection pump. NOTE: The COV closes for 10 min unless any of the following any actions are done: The engine is started. The ignition switch is turned off.
8. Turn the control valve to the FILL position.
9. Wait ( maximum 40 s ) until the left display reads 34.3 to 35.5 cm {13.5 to 14 in} of water. If the reading is slightly below, adjust it using the regulator knob. If the reading is far below, the EVAP system has a large leak. Check for leaks (using the ultrasonic leak detector if necessary) and repair.
10. Turn the control valve to the TEST position and press the START switch.
11. After the 2 min countdown (left display) is completed, check the test result (the failed/passed light on the tester). If the green light illuminates, the EVAP system is OK. If the red light illuminates, the EVAP system has leakage. Check for leaks using the ultrasonic leak detector and repair.
12. Close the gas cylinder valve.
13. Turn the control valve to the FILL position.
14. Press the ON/OFF switch to turn off the tester.

Rotor Balance Test

Note. The purpose of the rotor balance test is to find weak or non-contributing rotors. In this test, the high-tension leads are disconnected one by one to shut off the ignition on each rotor with the engine running. By carrying out the rotor balance test, a total determination of the compression pressure, air/fuel mixture, and ignition is possible.

1. Connect the WDS or equivalent to the DLC-2.
2. Access the RPM PID.
3. Start the engine.
4. Remove high-tension lead from each rotor and monitor the RPM PID value.
5. If the RPM PID does not drop, inspect the following: Fuel injector (FP1) (RP1) Spark plugs High-tension leads Ignition coil Compression pressure