With Scan Tool

Malfunction Indicator Light (MIL):

When problems occur in ECU monitored input or output devices, check for the cause with the SST (Mazda Special Service Tool #49 H018 9A1, or equivalent aftermarket "Scan" tool). Using the SST, input and output device failures can be retrieved from the ECU as malfunction code numbers. If there are multiple malfunction codes, the lowest number code is displayed first, followed by subsequent codes in numerical order.

NOTE: The ECU constantly checks for input device malfunctions. However, it only checks for output device malfunctions in a 3 second period after the ignition switch is turned "ON" with test connector grounded.

INSPECTION PROCEDURE

1. Warm up engine to normal operating temperature and turn ignition "OFF."

SST Connection LF Inner Fender:

2. Connect SST to check connector (Green, 6-pin) and negative battery terminal. Then set select switch to "A" position.

NOTE: Check connector is located at front of left wheel housing.

3. Connect a jumper wire between test connector (Green, 1-pin) and a ground.

NOTE: Test connector is located near SST check connector.

4. Turn ignition switch "ON."
5. Check that "88" flashes on the digital display and buzzer sounds for 3 seconds after turning ignition switch "ON."
6. If "88" does not flash, inspect check connector wiring.

NOTE: Main relay is mounted to the inner fender well in the left rear section of the engine compartment.

7. If "88" flashes and buzzer sounds continuously for more than 20 seconds, check for short circuit between ECU terminal 1B and check connector (Green, 6-pin). Replace ECU if necessary and repeat steps 3 and 4.
8. Check for malfunction code numbers.
9. Start engine and check for additional codes.
10. Note code numbers and check for causes.

NOTE: When repairs are completed, cancel malfunction code numbers by performing the after-repair procedure.


AFTER-REPAIR PROCEDURE

1. Cancel ECU malfunction code memory by disconnecting the negative battery cable and depressing the brake pedal for at least 20 seconds. Reconnect battery cable.
2. Connect SST to check connector (Green, 6-pin). Set select switch to "A" position.
3. Connect a jumper wire between test connector (Green, 1-pin) and a ground.
4. Turn ignition switch "ON."
5. Verify that no codes are displayed.
6. Start engine and verify that no code numbers are displayed.
7. If any new codes are retrieved, repeat step 10 of inspection procedure (above). If the same code(s) recurs, recheck repair work and look for what else might cause the code(s).