PISTON-SMOKE 5Z7766 - Caterpillar

Illustration 1 g01556854
(A) Location of actuator Diagnostics
Measure the value of the resistance in the actuator between L GN/RD and GY/YL (pins 1 and 3). See "Specifications". Proceed to step 2.
If the resistance value is incorrect see step 3. If the resistance value is correct see step 4.
Replace the actuator.
Disconnect the connectors from the actuator and measure the voltage between the harness connectors L-GN/RD and GY/YL (pins 1 and 3). See "Specifications". Proceed to step 5.
If the voltage value is incorrect see step 6. If the voltage value is correct see step 7.
Check the harness and repair the harness between the connector and the control panel. Also, check the source of the power system.
Fit the actuator and measure the voltage between terminals (pins 2 and 10 of connector) to the control panel. See "Specifications". Proceed to step 8.
If the voltage values are incorrect see step 9. If the voltage values are correct see step 10.
Check the harness and repair the harness between the connector and the control panel.
Replace the control panel. Specifications
Resistance ... 6 kOhmVoltage between connectors ... 5.0 V
Table 1
Voltage between terminal 1 and face 2
Terminal 1 Face 2
Damper (air outlet) 2 - 10 1.00 V
Table 2
Pins 2 and 10 of connector for Control Panel(1)
Face (1.0V - 1.67V)
B/L (2.57V)
Foot (3.4V)
Foot/Def. (4.47V)
Def. (4.93V)
(1) Voltage depends on the mode of the distributor.