New Holland CX720 Repair Manual page 2414

E0645-07-Gear Select Input Mechanical Out of Range (C.20.B.05.80
- G.30.C.24)
E0645-07 - Gear Select Input Mechanical Out of Range
Cause:
The Right Hand Module (RHM) has detected that the Gear Select Input circuit voltage is >0.25 volts from one of five
setpoints.
Possible failure modes:
1. The Gear Select Input circuit voltage is out of range by >0.25 volts .
2. Gear Select Switch S-24 failure.
3. RHM internal failure.
Solution:
1. Verify the fault is present. Enter the Infoview monitor - "Diagnose info" screen, "Console" sub menu. Select
"Gear Select Input" and observe the voltage. Observe the voltage as you select each switch position. Note
where the voltage falls in relation to the range markings as displayed on the bar graph.
The normal operating range for the Gear Shift Control circuit is 0.2 - 4.75 volts .
Switch Position
1
2
N
3
4
A. If the voltage reading is outside the range, continue with Step 2.
B. If the voltage reading is within the proper limits, the fault may be intermittent. Continue troubleshooting at
Step 6.
2. Verify the power supply and ground are good. Using a voltmeter, measure the voltage between the connector
X048 pin B(-) and pin A(+) at Gear Select Switch S-24.
A. If the voltage reads between 4.50 - 5.50 volts , the RHM 5V Reference and circuit ground are both good.
Continue troubleshooting at Step 3.
B. If the voltage is below 4.50 volts , then the RHM 5V Reference is missing. Check for an E0641-04 -
RHM 5V Reference fault. If present, correct that fault and resume operation. Otherwise, repair the open
between the Right Console harness X026 pin 17 and Gear Select Switch connector X048 pin A, or between
Right Console harness connector X026 pin 7 and Gear Select Switch connector X048 pin B. Continue
troubleshooting at Step 6.
3. Verify Gear Select Switch S-24 is good. Disconnect Gear Select Switch S-24. Using an ohmmeter, measure
the resistance between the pins of the Gear Select Switch S-24 connector X048 according to the table below.
Switch PIN
Position
1 A
2 A
N A
3 A
4 A
A. If the switch tests good, continue troubleshooting at Step 4.
POWER TRAIN - TRANSMISSION Mechanical
Display Range
B
C
D
E
F
OHMS PIN
1121-1239 C
1121-1239 C
1121-1239 C
1121-1239 C
1121-1239 C
2 4/7/2006
C.20.B / 76
Nominal Value
54 volts
47 volts
50 volts
42 volts
46 volts
OHMS PIN
192-212 B
242-268 B
342-378 B
542-599 B
1596-1764 B
Acceptable Range
29 - 0.79 volts
22 - 1.72 volts
25 - 2.75 volts
17 - 3.67 volts
21 - 4.71 volts
OHMS PIN
971-1073 A
1021-1129 A
1121-1239 A
1321-1460 A
2375-2625 A