Case IH AFX8010 Repair Manual page 1821

Command valve Header lift valve - Short circuit to B+ (G.10.A.12.20
- G.30.B.54)
AFX8010
E0049-03 - Header Raise / Lower Current Sense
Context:
The Header Raise/Lower Current Sense circuit is the ground path for the header raise and header lower 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 raise (L-11) or header lower (L-12) 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
"RAISE VLV" or "LOWER VLV" to monitor the current flow. Use the "COMMAND" and "ENGAGE" functions to
power the circuit at 100% output. Test both header raise and lower circuits.
The proper current for both header raise and header lower 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 main valves connector X022. Use a multimeter
to check the resistance of the header raise solenoid L-11 between connector X022 pins 4 & 6. Repeat
this resistance check for the header lower solenoid L-12 between connector X022 pins 5 & 7. 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 5.
3. Carefully disconnect connector X019 on the bottom of CCM1 module. Use a multimeter to check the
resistance of the header raise solenoid circuit between connector X019 pins J2-4 & J2-20. Repeat this
resistance check for the header lower solenoid L-12 between connector X019 pins J2-5 & J2-20.
A. If the resistance is lower than the previously measured resistance, there is a short in the main frame (MF)
harness between connector X022 and connector X019 wires 1112 white (raise) or 1113 white (lower) and
1117 black, 1118 black or 1114 black. Locate the short and repair. Continue with Step 8.
B. If the resistance is the same as previously measured, continue with Step 6.
4. Key on. Disconnect connector X022. Use a multimeter to check for voltage at connector X022 pin 6 or 7
(harness end). There should be no voltage on either wire.
TOOL POSITIONING - LIFTING
9706 1 27/05/2004
G.10.A / 3