With Scan Tool

Self Diagnostic System:

When troubles occur in the main input devices or output devices, check for the cause with the SST (Special Service Tool, Mazda part # 49 H018 9A1, or equivalent). Using the SST, failures of input and output devices are retrieved from the control unit as malfunction code numbers. If there is more than one failure code present, the lowest number malfunction code is displayed first, then the subsequent malfunction codes light up in order.

NOTE: The control unit constantly checks for malfunction of the input devices. But, it only checks for malfunction of output devices in a 3 second period after the ignition switch is turned ON with the test connector grounded.

INSPECTION PROCEDURE

1. Warm up the engine to normal operating temperature and stop it.

Tester Connection:

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

NOTE: The check connector is located near the fuel filter.

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

NOTE: The test connector is located near the check connector for Self-Diagnosis Checker.

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

NOTE: The main relay is located behind the battery.

7. If "88" flashes and the buzzer sounds continuously for more than 20 sec., check for short circuit between the engine control unit (1B) terminal and check connector (Green, 6-pin), then replace the engine control unit if necessary and perform steps 3 and 4 again.
8. Check for any malfunction code numbers.
9. If any codes are retrieved, repair the cause of the problem.

NOTE: Cancel the malfunction code numbers by performing the after-repair procedure after repairing.


AFTER-REPAIR PROCEDURE

1. Cancel the memory of malfunction code numbers by disconnecting the negative battery cable and depressing the brake pedal for at least 5 seconds, then reconnect the battery cable.
2. Connect the SST to the check connector (Green, 6-pin). Set the select switch to "A" position.
3. Connect a jumper wire between the test connector (Green, 1-pin) and a ground.
4. Turn the ignition switch ON, but do not start the engine for six seconds.
5. Start and warm up the engine, then run at 2,000 rpm for three minutes.
6. Verify that no malfunction code numbers are displayed.
7. If any codes are retrieved, repair the cause of the problem, then perform after repair procedures again.