With Scan Tool

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 is more than one malfunction code present, 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 operating temperature and turn ignition "OFF."

Connecting Tester:

2. Connect SST to check connector. Set the select switch to "A" position.

NOTE: Check connector is above right side wheel housing.

Test Connector:

3. Connect a jumper wire between test connector (Green, 1-pin) and a ground.
4. Turn the 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.
7. If "88" flashes and the buzzer sounds continuously for more than 20 seconds, replace ECU and repeat steps 3 and 4.
8. Note any code numbers and check for cause(s). Refer to Malfunction Code Charts under DIAGNOSTIC CHARTS. Repair as necessary.

NOTE: Following repairs, perform after-repair procedure.


AFTER-REPAIR PROCEDURE

1. Cancel malfunction code memory by disconnecting the negative battery cable and depressing the brake pedal for at least 5 seconds. Reconnect battery cable.
2. Turn ignition switch "ON" but do not start engine for 6 seconds.
3. Start and warm up engine, then run at 2,000 rpm for four minutes.
4. Connect SST to the check connector. Ground test connector (Green 1-pin) with a jumper wire.
5. Verify that no code numbers are displayed.