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.9 FAST IDLE/RUNS ON DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Start and warm up the engine to normal operating temperature. Is the ECT PID reading between 82-112°C {180-234°F} ? |
Yes | Go to the next step. |
| No | ECT PID is higher than 112°C {234°F}: Go to the symptom troubleshooting "No. 17 Cooling system concerns - Overheating". (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING .) ECT PID is less than 82°C {180°F}: Go to the symptom troubleshooting "No.18 Cooling system concerns - Runs cold". (See NO.18 COOLING SYSTEM CONCERNS-RUNS COLD .) |
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| 2 | Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs for the PCM, TCM, ABD HU/CU and the EPS CM. Are there any DTCs displayed? |
Yes | DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE .) |
| No | No DTC is displayed: Go to the next step. |
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| 3 | Measure voltages at PCM terminal 4W, 4Z, 4F (MT), 2O (MT) and TCM terminal 2E (AT). (See PCM INSPECTION .) (See TCM INSPECTION .) Is the voltage normal? |
Yes | Go to the next step. |
| No | If PCM terminal 4W voltage is not as specified: Inspect the A/C switch, refrigerant pressure switch and the fan switch. (See REFRIGERANT PRESSURE SWITCH INSPECTION .) (See CLIMATE CONTROL UNIT INSPECTION .) If PCM terminal 4Z voltage is not as specified: Inspect the refrigerant pressure switch (medium pressure). (See REFRIGERANT PRESSURE SWITCH INSPECTION .) If PCM terminal 4F voltage is not as specified (MT): Inspect the CPP switch. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION .) If PCM terminal 2O voltage is not as specified (MT): Inspect the neutral switch. (See NEUTRAL SWITCH INSPECTION .) If TCM terminal 2E voltage is not as specified (AT): Inspect the TR switch. (See TRANSMISSION RANGE (TR) SWITCH INSPECTION .) |
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| 4 | Is there air leakage felt or heard at the intake-air system components while the racing engine to a higher speed? | Yes | Repair or replace parts if necessary. |
| No | Inspect the following:
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| 5 |
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