Mazda MX-5 Miata Sport 2007 Manual page 2065

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
(See CLIMATE CONTROL UNIT INSPECTION .)
Throttle Position (TP) Sweep Inspection
1. Connect the M-MDS 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, P0638, P2101, P2107, P2108, P2109, P2112, P2119, P2122, P2123,
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P2127, P2128, P2135, P2138
If any one DTC is displayed, perform DTC inspection.
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4. Access TP_REL PID.
5. Verify that the PID reading is within the CTP value. (See PCM INSPECTION [LF] .)
If the PID reading is out of range, perform the following:

Remove the air duct from the throttle valve body.
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Verify that the throttle valve opens when the accelerator pedal is depressed.

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6. Gradually depress the throttle pedal and verify that the PID reading increases accordingly.
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 WOT value. (See PCM
INSPECTION [LF] .)
If the PID reading is out of range, perform the followings:

Remove the air duct from throttle valve body.

Verify that the throttle valve opens when throttle pedal is depressed.
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VARIABLE INTAKE AIR CONTROL OPERATION INSPECTION
1. Start the engine.
2. Inspect the rod operation. (See VARIABLE INTAKE AIR SHUTTER VALVE ACTUATOR
INSPECTION [LF] .)
If the rod operation is not as specified, inspect as follows:

1. Stop the engine.
2. Connect the M-MDS or equivalent to the DLC-2.
2007 Mazda MX-5 Miata Sport
If the throttle valve opens, inspect the throttle position sensor and related wiring
harness.
If the throttle valve does not open, inspect the throttle actuator control motor and
related wiring harness.
If the throttle valve opens, inspect the throttle position sensor and related wiring
harness.
If the throttle valve does not open, inspect the throttle actuator control motor and
related wiring harness.