Contents: Checking the signal shape ⇓ Checking the regulator ⇓ ISCA Characteristics ⇓ Checking the wiring ⇓
Checking the signal shape
With the engine idling, check the regulator signal: 1 - Closing control signal; 2 - Opening control signal.
Checking the regulator
Turn off the ignition, disconnect the connector and measure the resistance of the regulator. Nominal value: 14.6-16.2 Ohm (pins 1 and 2); 11.1-12.7 Ohm (contacts 2 and 3).
ISCA Characteristics
| Signal duty cycle | Air flow, m³/h |
| 15% | 0,7-1,7 |
| 35% | 6,0-11,2 |
| 70% | 30,0-42,0 |
| 96% | 45,0-55,0 |
Checking the wiring
With the ignition on, measure the voltage between the contacts of the wire part of the connector and the ground.
| Circuit under test | Nominal voltage |
| Contact 1 - "ground" | 1.3 V |
| Contact 2 - "ground" | B+ |
| Contact 3 - "ground" | 2.0 V |
1. Control signal (opening)
2. Nutrition (B+)
3. Control signal (closing)