Control Valve Lateral Tilt Valve - Short Circuit To B+ (G.20.A.13.20 - G.30.B.54) - Case IH AFX8010 Repair Manual

Control valve Lateral tilt valve - Short circuit to B+ (G.20.A.13.20 -
G.30.B.54)
AFX8010
E0048-03 - Header Tilt Current Sense
Context:
The Header Tilt Current Sense circuit is the ground path for the header tilt CW and header tilt CCW PWM solenoids.
By monitoring current flow on the return path of the solenoids, the module can provide precise control of solenoid
engagement. When this error message is reported, this is an indication of excessive current draw on the circuit,
or a result of a high voltage short on the return line.
Cause:
The header tilt CW (L-18) or header tilt CCW (L-19) circuits have excessive current draw, or are shorted to a
high voltage source.
Possible failure modes:
1. Bad solenoid.
2. Return side wiring shorted to 12 volts.
3. Controller internal failure (internal regulator failure).
Solution:
1. Enter the Universal Display Plus "DIAG" screen. Select the "HDR HEIGHT/TILT" sort menu, and select "TILT
CCW VLV" or "TILT CW VLV" to monitor the current flow. Use the "COMMAND" and "ENGAGE" functions to
power the circuit at 100% output. Test both header tilt CW and tilt CCW circuits.
The proper current for both header tilt CW and header tilt CCW should be approximately 1.0 - 1.5 amps. The
fault code is triggered by current flow greater than 3.3 amps.
A.
If the reading is greater than 3.3 amps on either circuit, continue with Step 3.
B. If the readings are normal (1.0 - 1.5 amps), continue the troubleshooting at Step 8.
C. If there is no current reading on either circuit, the module may have failed as a result of a 12V short on
the Isense circuit. Continue with Step 6.
NOTE: If the current reading is high, immediately shut off the circuit after verifying the reading to prevent
module damage.
2. Turn the key switch to the OFF position and disconnect the feeder valves connector X021. Use a multimeter
to check the resistance of the header tilt CW solenoid L-18 between connector X021 pins G & H. Repeat
this resistance check for the header tilt CCW solenoid L-19 between connector X021 pins J & K. The proper
resistance range for the solenoids is 7.2 - 11.2 ohms.
A. If either solenoid is out of specification, replace the solenoid. Continue with Step 8.
B. If both solenoids are within specification, continue with Step 4.
3. Disconnect the main frame (MF) harness at connector X008. Carefully remove connector X020 from the
bottom of the CCM1 module. Use a multimeter to check the resistance between the front frame (FF) harness
end of connector X008 pin 13 and connector X020 pin J3-1 (tilt CCW). Repeat this resistance check between
the front frame (FF) harness end of connector X008 pin 13 and connector X020 pin J3-2 (tilt CW).
A. If the resistance is lower than the previously measured resistance, there is a short in the front frame (FF)
harness between connector X020, connector X021 and connector X008 wires 548 white (tilt CCW) or 549
white (tilt CCW) and 553 blue, 554 blue or 555 blue. Locate the short and repair. Continue with Step 8.
B. If the resistance is the same as previously measured, continue with Step 6.
4. Carefully remove connectors X019 and X020 from the bottom of the CCM1 module. Use a multimeter to check
the resistance between the harness ends of connector X019 pin J2-10 and connector X020 pin J3-1 (tilt
TOOL POSITIONING - TILTING
9707 1 27/05/2004
G.20.A / 6