2. Start the engine and warm it up to normal operating temperature.
3. Verify that the DTC P0480, P0481 or P0482 is not shown and cooling fan operating while the KOER
self-test or the KOER self-test. (See
KOEO/KOER SELF TEST [LF]
.)
4. Verify that the DTC P0480, P0481 or P0482 is not shown and cooling fan while operating the KOER
self-test.
If the DTC P0480 is shown, perform the DTC troubleshooting procedure. (See
DTC P0480 [LF]
.)
(See
DTC P0481 [LF]
.) (See
DTC P0482 [LF]
.)
If the cooling fans do not operate while KOER self-test, proceed the followings:
1. Inspect the cooling fan motor and wiring harness between cooling fan motor and GND.
2. Select FAN1, FAN2 and FAN3 PIDs.
3. Turn ignition switch off and disconnect the cooling fan motor connector.
4. Verify that each cooling fan relay operating sound is heard, when turn each cooing fan relay to on
from off using simulation function of FAN1, FAN2 and FAN3 PIDs.
If the operation sound is not heard, inspect for suspected cooling fan relay is stuck open or
close.
If the operation sound is heard, inspect wiring harness and connector between all cooling fan
relays and cooling fan motor.
If simulation function of M-MDS is not used:
1. Connect the M-MDS or equivalent to DLC-2.
2. Start the engine and warm it up to normal operating temperature.
3. Perform the KOER self-test. (See
KOEO/KOER SELF TEST [LF]
.)
4. Verify that the DTC P0480, P0481 or P0482 is not shown and cooling fan operating while the KOER
self-test.
If the DTC P0480 is shown, perform the DTC troubleshooting procedure. (See
DTC P0480 [LF]
.)
(See
DTC P0481 [LF]
.) (See
DTC P0482 [LF]
.)
If the cooling fans do not operate while KOER self-test, proceed the followings:
1. Inspect the cooling fan motor and wiring harness between cooling fan motor and GND.
2. Turn the ignition switch to off.
3. Disconnect ECT sensor connector.
4. Verify that the operation sound heard form all cooling fan relays (No.1, No.2 and No.3), when the
ignition switch to ON position.
If the operation sound is not heard, inspect for suspected cooling fan relay is stuck open or
close.
If the operation sound is heard, inspect wiring harness and connector between all cooling fan
relays and cooling fan motor.
5. Turn the ignition switch off and disconnect the ECT sensor connector.
6. Reconnect the ECT sensor and clear the DTC from PCM memory using the M-MDS or equivalent.
VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION INSPECTION
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
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