With Scan Tool

Self Diagnostic System:

When problems occur in ECU monitored input or output devices, check for the cause with Mazda Self-Diagnosis Checker (SST #49 H018 9A1 or equivalent aftermarket "Scan" tool). Using the SST, input and output device failures are retrieved from the ECU as malfunction code numbers. If more than one failure code is present, the lowest number malfunction 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 during a 3 second period after the ignition switch is switched "ON" with test connector grounded.

INSPECTION PROCEDURE

SST Connection:

1. Warm engine to operating temperature and switch ignition "OFF."
2. Connect SST to check connector (Green, 6-pin) and negative battery terminal. Set select switch to "A" position.

Grounding Test Connector Pin:

3. Connect a jumper wire between test connector (Green, 1-pin) and ground.
4. Turn ignition switch "ON."
5. Check that digital display flashes "88" 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 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. Check for any malfunction code numbers.
9. Start engine and check for further malfunction code numbers.
10. If any codes are retrieved, repair the cause of the problem. Refer to DIAGNOSTIC CHARTS.

NOTE: Following repairs, cancel malfunction code numbers by performing 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 the SST to check connector (Green, 6-pin). Set select switch to "A" position.
3. Connect a jumper wire between the test connector (Green, 1-pin) and ground.
4. Turn ignition switch "ON."
5. Verify that no malfunction code numbers are displayed.
6. Start engine and verify that no malfunction code numbers are displayed.
7. If any codes are retrieved, repair the cause and repeat after-repair procedure.