Testing Cautions
Before connecting or disconnecting ECU harness connector to or from the ECU, be sure that ignition switch is in the "OFF" position and negative battery cable is disconnected or damage to the ECU may result. This is important because battery voltage is applied to the ECU even when the ignition switch is in the "OFF" position.
When performing an ECU input/output signal inspection, remove pin terminal retainer from connectors. This will make probing of the connector pins much easier and safer.
When connecting or disconnecting pin connectors from the ECU, take care not to bend or break any pin terminals.
Before replacing ECU, perform the ECU input/output signal inspection to be sure ECU is malfunctioning.
ECU DIAGNOSTIC CODES CHART
| Codes | Component | ||||||
|---|---|---|---|---|---|---|---|
| 11 | Crank Angle Sensor | ||||||
| 12 | Airflow Meter | ||||||
| 13 | Coolant Temperature Sensor | ||||||
| 21 | Ignition Signal | ||||||
| 22 | Idle Speed Control | ||||||
| 33 | Exhaust Gas Sensor | ||||||
| 41 | (1) Fuel Temperature Sensor | ||||||
| 42 | Throttle Sensor Circuit | ||||||
| 43 | (3) | ||||||
| 44 | (2) | ||||||
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