1-4-4 (Load Signal From Fuel Injection System Absent Or Faulty)
- Check for codes in other systems by activating diagnostic test mode No. 1. See DIAGNOSTIC TEST MODE NO. 1 under SELF-DIAGNOSTICS . Clear codes in ignition and fuel injection systems (if present), and test drive car.
- If code reoccurs, connect measuring unit to ignition ECU. See MEASURING UNIT under SELF-DIAGNOSTIC SYSTEM . Start engine. Connect voltmeter between measuring unit terminals No. 20 and 42. With engine idling at normal operating temperature, approximately 50 millivolts should be present. Voltage reading should increase with engine RPM. If signal is present, repeat diagnostic test using different ignition ECU.
- If signal is not present, turn ignition off. Connect ohmmeter between measuring unit terminals No. 20 and 42. Infinite ohms should be present. If zero ohms are present, circuit is shorted to ground.
- Connect voltmeter between measuring unit terminals No. 20 and 42. Turn ignition on. If battery voltage is present, circuit is shorted to voltage.
- If voltage readings are okay but signal is still not present, measure resistance in circuit between ignition ECU terminal No. 12 and fuel injection ECU terminal No. 12 (Pink wire). If circuit is okay but signal is still not present, repeat test using new fuel injection ECU. Clear all codes in all other systems. See DIAGNOSTIC TEST MODE NO. 1 under SELF-DIAGNOSTICS .