STATUS
CODE
DISPLAY MESSAGE RECOVERY METHOD CIRCUIT
8961-3
(cont)
8961 Automatic RH Traction
Node 3
DESCRIPTION BEHAVIOR
One of the on/off valve coil is detected as
shorted or open circuit - (RH Node 3)
Specific coil function disabled, determined by
operational test.
Probable Causes and Test Procedures
5. Check coil wiring:
• Pin 9 (EV1)- SPED OUT 2
• Pin 11 (EV2) – Side Shift Right
• Pin 33 (EV3) – Side Shift Left
• Pin 34 (EV4) – Load Check Valve (SV1)
• Pin 8 (EV5)- SPED OUT 1
a. Measure from Pin __ (above) to corresponding coil connector for continuity:
YES- Proceed to step 5b.
NO- Repair wire, pin, or crimp (replace harness only if not repairable).
b. Check for shorted wiring, by measuring across coil connector and verifying resistance < 1k Ohms.
YES- Determine location of short in wiring, separate and repair.
NO- Proceed to step 6.
6. Internal box checks (flyback diode):
a. Disconnect CPS41 connector.
b. Measure from Pin 3 to Pin ___ (above) with the positive lead on coil pin and negative lead on Pin 3.
Does it show > 1k Ohms?
YES- Proceed to step 6c.
NO- Internal flyback diode is shorted, replace controller.
c. Measure from Pin 3 to Pin ____ (above) with the positive lead on Pin 3, and the negative lead on
coil pin. Does it show < 100 Ohms?
YES- Diode is fine, no cause found, contact Service Engineering.
NO- Diode is open, drive may be damaged, contact Service Engineering.
2200 YRM 1415 Troubleshooting
31
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