TM 10-3930-675-24-1
ELECTRONIC CONTROL UNIT (ECU) INPUT VOLTAGE TROUBLESHOOTING - CONTINUED
0013 00
Table 4. Error Code 201 - Supply Voltage to Tophandler ECU (791) Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 201 - Supply Voltage to Tophandler 1. Check for emergency stop in
Disengage emergency stop
ECU (791) Failure.
engaged position. (Multiple
button. (Error codes 121 and 201
error codes will display if the
will normally be one of the error
emergency stop button is
codes displayed.)
engaged during crank and
start.)
2. Check voltage (24V) at X154
a. If no voltage (24V) is found at
pins 2 and 3 with the ignition
X154 pin 3, gain access to
emergency stop switch and
ON (WP 0048 00-5).
check
connections
and
DIAG ATTACHMENT 1(16)
SYSTEM POWER 24.00V
continuity (WP 0083 00) and
POWER RI CAN 24.00V
check continuity of wires 1542
POWER LE CAN 24.00V
and 1543A (WP 0048 00-5).
10 V REF OUT 10.00V
b. If no voltage (24V) is found at
X154 pin 1, check circuit
breaker F30 and continuity of
wires A1504 and 304 (WP
0048 00-32).
c. Replace damaged of faulty
circuit breaker (WP 0074 00).
d. Repair or replace damaged
wires or connectors (WP 0113
00).
e. Replace damaged or faulty
emergency stop switch (WP
0083 00).
3. Check voltage (24V) at X155 a. If no voltage (24V) is found at
pin 11 (WP 0048 00-5) and
X155 pin 11, check continuity
X161 pin 3 (WP 0048 00-6)
of wire 1542 and 1543A (WP
with the ignition ON.
0048 00-5).
b. If no voltage (24V) is found at
X161 pin 3, check continuity
of wire A1543B (WP 0048 00-
6).
c. Repair or replace damaged
wires or connectors (WP 0113
00).
0013 00-6
