With Scan Tool

Computerized Engine Control System (EGI):

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 continuously 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:

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

NOTE: Check connector and test connector are located near left side strut tower.

3. Connect a jumper wire between test connector (Green, 1-pin) and a ground.
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, check main relay, power supply circuit and check connector wiring.
7. If "88" flashes and buzzer sounds continuously for more than 20 seconds, check for short circuit between ECU terminal 1F and check connector (Green, 6-pin). Replace ECU if necessary and repeat previous steps.
8. Note code numbers and check causes. Testing and Inspection

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 5 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" but do not start engine for six seconds.
5. Start and warm up engine, then run at 2,000 rpm for two minutes.
6. Verify that no code numbers are displayed.
7. If any new codes are retrieved, repeat step 8 of inspection procedure (above). If the same code(s) recurs, recheck repair work and look for what else might cause the code(s).