Mazda RX8 Engine Troubleshooting

ENGINE TROUBLESHOOTING

FOREWORD

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• When the customer reports a vehicle malfunction; check the malfunction indicator (MIL) indication and diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart: lamp
• If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom troubleshooting. (See QUICK DIAGNOSTIC CHART .)
• If a DTC exists; diagnose the applicable DTC inspection: (See DTC TABLE .)

Notes:

INTERMITTENT CONCERN TROUBLESHOOTING

Vibration Method

• If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform the steps below .

NOTE:

• There are several reasons why vehicle Or vibration could cause an electrical malfunction. Some of the to check for are: engine things
• Wiring harnesses not having full play .
• Connectors not fully seated.
• Wires laying across brackets or moving parts
• An improperly routed, improperly clamped, or loose wiring harness can cause wiring to become pinched between parts .
• Wires routed too close to hot parts .
• The connector joints; points of vibration; and places where wiring harnesses pass such as through the firewall and body are the major areas to be checked. panels

Inspection Method for Switch Connectors or Wires

• 1 Connect the WDS or equivalent to the DLC-2.
• 2 Turn ignition switch to 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 . Turn the switch on manually .
• 5 Shake each connector or wiring hamness a bit vertically and horizontally while monitoring the PID
• If the PID value is unstable; check for poor connection:

Inspection Method for Sensor Connectors or Wires

• Connect the WDS or equivalent to the DLC-2.
• 2 Tumn the ignition switch to the ON position (Engine off) .

NOTE:

• If the starts and runs; perform the following steps at idle. engine
• 3 Access the PIDs for the switch you are inspecting.
• 4 Shake each connector or wiring harness a bit vertically and horizontally while monitoring the PID
• If the PID value is unstable; check for poor connection:

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 starts and runs, perform the following steps at idle. engine

• 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

Inspection Method for Actuators or Relays

• 1 Connect the WDS or equivalent to the DLC-2.
• 2 Turn the ignition switch to the ON position (Engine off) .

NOTE:

• If the starts and runs; perform the following steps at idle. engine
• 3 Prepare the output state control function for actuators or relays that you are inspecting.
• 4 Vibrate the actuator Or with your finger for 3 s after output state control function is activated. relay
• If a variable click sound is heard, check for poor connection or poorly mounted actuator or both; OI the relay .

NOTE:

• Moving the relays too strongly may result in open relays.

Water Sprinkling Method

CAUTION:

• Indirectly change the temperature and humidity by spraying water onto the front of the radiator:
• If a vehicle is subject to water leakage; the leakage may damage the control module. When testing a vehicle with a water leakage problem; caution must be used. special

If the malfunction occurs only during high humidity or rainylsnowy weather; perform the following steps:

• 1 Connect the WDS or equivalent to the DLC-2 if you are inspecting sensors or switches.
• 2 Tumn the ignition switch to the ON position (Engine off) .

NOTE:

• If the starts and runs; perform the following steps at idle. engine
• 3 Access the PIDs for sensors or switches if you are inspecting sensors or switches.

4. If you are inspecting the switch; turn it on manually .

• 5 Spray water onto the vehicle or run it through a car wash.
• If the PID value is unstable or malfunction occurs, repair or replace the part if necessary .

ENGINE SYMPTOM TROUBLESHOOTING

• Confirm trouble symptom using the following diagnostic index; then go to the applicable troubleshooting chart .

Diagnostic Index

Table Caption: This table provides a troubleshooting guide for common engine-related issues, listing the problem, a brief description, and the corresponding page number for detailed solutions.

Table Caption: This table lists common engine performance issues, their typical operating conditions (e.g., deceleration, acceleration, cruise), and related symptoms, often referring to other numbered diagnostic sections for more detailed information.

**Table