Rx8-Engine-Fault-finding.pdf

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ENGINE TROUBLESHOOTING
FOREWORD
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When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL)
indication and diagnostic trouble code (DTC), then diagnose the malfunction according to the following
flowchart:
If a DTC exists, diagnose the applicable DTC inspection. (See DTC TABLE .)
If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom
troubleshooting. (See QUICK DIAGNOSTIC CHART .)
*: Malfunction Indicator Lamp (MIL), Generator Warning Light, Security Light
Notes:
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RX8-Engine Troubleshooting
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INTERMITTENT CONCERN TROUBLESHOOTING
Vibration Method
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If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating,
perform the steps below.
NOTE:
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•
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There are several reasons why vehicle or engine vibration could cause an electrical malfunction.
Some of the things to check for are:
Connectors not fully seated.
Wiring harnesses not having full play.
Wires laying across brackets or moving parts
Wires routed too close to hot parts.
An improperly routed, improperly clamped, or loose wiring harness can cause wiring to become
pinched between parts.
The connector joints, points of vibration, and places where wiring harnesses pass such as through
the firewall and body panels are the major areas to be checked.
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 harness a bit vertically and horizontally while monitoring the PID.
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If the PID value is unstable, check for poor connection.
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RX8-Engine Troubleshooting
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Inspection Method for Sensor Connectors or Wires
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. 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 engine starts and runs, perform the following steps at idle.
3. Access the PIDs for the switch you are inspecting.
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RX8-Engine Troubleshooting
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4. Vibrate the sensor slightly with your finger.
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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 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:
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Moving the relays too strongly may result in open relays.
Water Sprinkling Method
CAUTION:
•
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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, special caution must be used.
If the malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps:
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RX8-Engine Troubleshooting
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1. Connect the WDS or equivalent to the DLC-2 if you are inspecting sensors or switches.
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 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.
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If the PID value is unstable or malfunction occurs, repair or replace the part if necessary.
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RX8-Engine Troubleshooting
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