RING-VANE ROTOR 0664133 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the air choke actuator's solenoid or if one of the diagnostic codes in Table 1 is active.
Table 1
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
525-5 Choke Actuator : Current Below Normal     The circuit driver for the electrohydraulic actuator's solenoid is energized. The Electronic Control Module (ECM) detects no current from the actuator or a current that is less than the normal level.     The shutdown output is activated. The code is logged.    
525-6 Choke Actuator : Current Above Normal     The circuit driver for the electrohydraulic actuator's solenoid is energized. The ECM detects a current from the actuator that is greater than the normal level.    The ECM controls the air choke actuator by adjusting current flow through the actuator's solenoid.The diagnostic code is probably caused by a problem in a harness or by a problem with an electrical connector. The next likely cause is a problem inside the actuator solenoid. The least likely cause is a problem with the ECM.Logged diagnostic codes provide a historical record. Before you begin this procedure, use Caterpillar Electronic Technician (ET) to print the logged codes to a file.This troubleshooting procedure may generate additional diagnostic codes. Keep your mind on correcting the cause of the original diagnostic code. Clear the diagnostic codes after the problem is resolved.
Illustration 1 g01439374
Schematic of the circuit for the air choke actuatorTest Step 1. Inspect the Electrical Connectors and WiringNote: This step is important for troubleshooting a problem with instability.
Illustration 2 g01431198
Terminal Box (1) ECM connector J2/P2 (2) ECM connector J1/P1 (3) 16 amp circuit breaker (4) Connectors J3/P3 for the customer's connector (5) Connectors J4/P4 for the optional control panel (if equipped) or for a customer's connector (6) J5/P5 connectors for the harness (7) J6/P6 connectors for the harness
Turn the engine control switch to the OFF position. Switch the 16 amp circuit breaker for the ECM to the OFF position.Note: For the following steps, refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01439397
P2 ECM terminals that are used by the air choke actuator's solenoid on in-line engines and vee engines (P2-63) Air choke actuator's circuit driver (P2-64) Return
Illustration 4 g01439394
Terminal locations on the P6 connector that are used by the air choke actuator's solenoid on in-line engines and on vee engines (P6-12) Return (in-line engines) (P6-22) Air choke actuator's circuit driver (in-line engines) (P6-44) Return (vee engines) (P6-45) Air choke actuator's circuit driver (vee engines)
Illustration 5 g01439378
Air choke actuator (AA) Solenoid's connector (A) Air choke actuator's circuit driver (B) Return (8) Engine harness connectors for the air choke actuator (in-line engines) (9) Air choke actuator (in-line engines)
Illustration 6 g01439379
Air choke actuator (10) Air choke actuator (vee engines) (11) Engine harness connectors for the air choke actuator (vee engines)
Thoroughly inspect each of the following connectors:
ECM J2/P2 connectors
J6/P6 connectors on the terminal box
Connectors for the air choke actuator
Check the allen head screw on each of the ECM connectors