Idle speed block (JN engine)
1. Be guided Chapter 24.
Lambda control (JN engine)
2. On an engine at normal operating temperature, connect an exhaust gas analyzer with a measuring tube.
3. Start the engine and let it idle for at least two minutes.
4. Measure the CO content, then clamp hose 2 shown in fig. 3.36. The CO content should briefly increase, then decrease. If not, disconnect the Lambda sensor wires and ground the green wire clamp for about twenty seconds. If the CO content is now changing, the lambda sensor is defective.
Lambda control (PS engine)
5. Be guided Chapter 27, paragraphs 2-4.
Enrichment cold acceleration
6. Connect the multimeter to the differential pressure controller.
7. Disconnect the wiring from the lower temperature sensor.
8. Remove the air intake elbow from the airflow meter.
9. Turn on the ignition. The current in the control circuit must be 80-100 mA.
10. Raise the air flow meter plate. The current in the control circuit should briefly increase by more than 100 mA.
Enrichment restart and warm-up
11. Disconnect the high voltage wire from the ignition coil and ground it.
12. Connect the multimeter to the differential pressure controller.
13. Disconnect the wiring from the lower temperature sensor.
14. Operate the starter for approximately two seconds, then leave the ignition on. The current in the control circuit should rise to 120 mA within 30-60 seconds, then within 20-50 seconds it should fall to 80-100 mA.
Cold start valve and start fuel switch
15. Be guided Chapter 24, paragraphs 10-18.
Auxiliary pneumatic valve
16. Be guided Chapter 24, paragraphs 29-35.
Basic throttle setting
17. Be guided Chapter 24, paragraphs 39-41.
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