Engine Control System: Other Mazda RX-8 I

Not Using the WDS or Equivalent

Note. The PCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the PCM is necessary to determine where the malfunction occurs.

Scheme 523

Scheme 524

Scheme 525

Scheme 526

Scheme 527

Scheme 528

Scheme 529

Scheme 530

Using the WDS or Equivalent

Note. PIDs for the following parts are not available on this model. Go to the appropriate part inspection page. Main relay (See RELAY INSPECTION .)

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to ON position.
3. Measure the PID value. If PID value is not within the specification, follow the instructions in Action column. NOTE: The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control. For input/output signals except those of the monitoring items, use a voltmeter to measure the PCM terminal voltage. The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows. ACCS, AIP RLY, ALTF, APV, ARPMDES, DEI, ETC_DSD, EVAPCP, FAN1, FAN2, FP, FPRR, FUELPW, GENVDSD, HTR11, HTR12, IASV, MOP POS, PACNTV, PREDELI, SSV, test

PID/DATA MONITOR

Scheme 531

1. Connect the WDS or equivalent to the DLC-2.
2. Set up the WDS or equivalent (including the vehicle recognition).
3. Select "Module Programming".
4. Select "Programmable Module Installation".
5. Select "PCM" and perform procedures according to directions on the WDS or equivalent screen. NOTE: If the PCM is replaced with a new one, the PCM stores DTC P0602 and illuminates the MIL even though no malfunction is detected. This means the PCM has not been configured yet.
6. Retrieve DTCs using the WDS or equivalent and verify that there is no DTC present. If any DTC is present, perform applicable DTC inspection. (See «DTC TABLE»(ref-221524-S13840891482006022500000) .)

Open circuit

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Neutral switch terminal 2A and PCM terminal 2O Neutral switch terminal 1A and body ground

Short circuit

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Neutral switch terminal 2A and body ground Neutral switch terminal 2A and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. CPP switch terminal B and PCM terminal 4F CPP switch terminal A and body GND

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. CPP switch terminal B and body GND CPP switch terminal B and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Metering oil pump switch terminal A and PCM terminal 2N Metering oil pump switch terminal C and PCM terminal 1 U

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Metering oil pump switch terminal A and body ground Metering oil pump switch terminal A and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. SSV switch terminal A and PCM terminal 1D SSV switch terminal B and body ground

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. SSV switch terminal A and body ground SSV switch terminal A and power supply

Scheme 532

1. Disconnect the SSV switch connector.
2. Remove the SSV installation screws and remove the SSV switch.
3. Install in the reverse order of removal. SSV switch tightening torque 1.3-1.9 N.m {14-19 kgf.cm, 12-16 in.lbf}

Scheme 533

1. Remove the following part for easier access. Generator (See «GENERATOR REMOVAL/INSTALLATION»(ref-221546-S09847521932006022500000) .)
2. Drain the engine coolant. (See «ENGINE COOLANT REPLACEMENT»(ref-221536-S22669717172006022500000) .)
3. Disconnect the ECT sensor connector.
4. Remove the ECT sensor.
5. Replace the gasket.
6. Install in the reverse order of removal. ECT sensor tightening torque 15.7-23.5 N.m {1.61-2.39 kgf.m, 11.6-17.3 ft.lbf}

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. ECT sensor terminal A and PCM terminal 2K ECT sensor terminal B and PCM terminal 1U

1. If there is continuity at the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. ECT sensor terminal A and body ground ECT sensor terminal A and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal D and PCM terminal 5K MAF/IAT sensor terminal E and PCM terminal 4U

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal D and body ground MAF/IAT sensor terminal D and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Throttle body terminal C and PCM terminal 2F Throttle body terminal D and PCM terminal 1M Throttle body terminal E and PCM terminal 1Q Throttle body terminal F and PCM terminal 1J

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Throttle body terminal E and body ground Throttle body terminal E and power supply Throttle body terminal F and body ground Throttle body terminal F and power supply Throttle body terminal D and body ground Throttle body terminal D and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. APP sensor terminal A and PCM terminal 4X APP sensor terminal B and PCM terminal 5AB APP sensor terminal C and PCM terminal 5C APP sensor terminal D and PCM terminal 4Y APP sensor terminal E and PCM terminal 5AE APP sensor terminal F and PCM terminal 5F

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. APP sensor terminal D and body ground APP sensor terminal D and power supply APP sensor terminal A and body ground APP sensor terminal A and power supply APP sensor terminal F and body ground APP sensor terminal F and power supply APP sensor terminal C and body ground APP sensor terminal C and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal A and main relay terminal C MAF/IAT sensor terminal B and PCM terminal 5U MAF/IAT sensor terminal C and PCM terminal 5N

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal A and body ground MAF/IAT sensor terminal C and power supply MAF/IAT sensor terminal C and body ground

Scheme 534

Scheme 535

1. For the AT vehicles, perform the following procedure for easier access. Remove the rubber hanger. Remove the rear tunnel member. Remove the front tunnel member. Remove the catalytic converter installation nuts. Remove the ATF level gauge pipe. (See «AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION»(ref-221769-S07547900412006022500000) .)
2. Remove the front HO2S using the SST (49 T018 001).
3. Install in the reverse order of removal. Front HO2S tightening torque 29-49 N.m {3.0-4.9 kgf.m, 22-36 ft.lbf}

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Front HO2S terminal A and PCM terminal 2B Front HO2S terminal B and PCM terminal 2C Front HO2S terminal C and main relay terminal C Front HO2S terminal D and PCM terminal 1V

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Front HO2S terminal A and body ground Front HO2S terminal A and power supply Front HO2S terminal B and body ground Front HO2S terminal B and power supply Front HO2S terminal D and body ground

Scheme 536

1. Remove the rear HO2S connector.
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.

Scheme 537

1. Remove the rear HO2S using the SST (49 T018 001).

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Rear HO2S terminal A and PCM terminal 2Q Rear HO2S terminal B and PCM terminal 1U Rear HO2S terminal C and main relay terminal C Rear HO2S terminal D and PCM terminal 2A

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Rear HO2S terminal A and body ground Rear HO2S terminal A and power supply Rear HO2S terminal B and body ground Rear HO2S terminal B and power supply Rear HO2S terminal D and body ground

Scheme 538

1. Disconnect the BARO sensor connector.
2. Remove the BARO sensor installation bolt and remove the BARO sensor.
3. Install in the reverse order of removal. BARO sensor tightening torque 7.8-10.8 N.m {80-110 kgf.cm, 69-95 in.lbf}

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. BARO sensor terminal A and PCM terminal 5S BARO sensor terminal B and PCM terminal 4U BARO sensor terminal C and PCM terminal 4K

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. BARO sensor terminal A and body ground BARO sensor terminal A and power supply BARO sensor terminal C and body ground BARO sensor terminal C and power supply

Scheme 539

1. Disconnect the KS connector.
2. Remove the KS installation bolt and remove the KS.
3. Install in the reverse order of removal. KS tightening torque 15-25 N.m {1.6-2.5 kgf.m, 12-18 ft.lbf}

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. KS terminal A and PCM terminal 1T KS terminal B and PCM terminal 1F

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. KS terminal A and body ground KS terminal A and power supply KS terminal B and body ground KS terminal B and power supply

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Eccentric shaft position sensor terminal A and PCM terminal 2U Eccentric shaft position sensor terminal B and PCM terminal 2X

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Eccentric shaft position sensor terminal A and body ground Eccentric shaft position sensor terminal A and power supply Eccentric shaft position sensor terminal B and body ground Eccentric shaft position sensor terminal B and power supply