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 - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 201 - Supply Voltage to Tophandler 4. Remove the cover from the a. If no voltage (24V) is found at
ECU (791) Failure - Continued.
tophandler junction box to gain
X180 pin 3, check continuity
access. Check voltage (24V) at
of wire GY between X180 and
X180 pin 3 (WP 0048 00-23)
X185 (WP 0048 00-23) and
with the ignition ON.
wire GY between X185 and
X161 and wire A1543C (WP
0048 00-6).
b. Repair or replace damaged
wires or connectors (WP 0113
00).
c. Replace damaged open or
shorted harness (WP 0113 00
and WP 0220 00).
5. Check voltage (24V) between a. If no voltage (24V) is found,
X186 pins 1 and 2 (WP 0048
check circuit breaker F40
00-23).
located under the auxiliary
pump (WP 0048 00-33).
b. If no voltage (24V) is found,
check continuity of wires W28
between X187 and X186 pin 1
(WP 0048 00-23).
c. Replace damaged or faulty
circuit breaker (WP 0074 00).
d. Repair or replace damaged
wires or connectors (WP 0113
00).
e. Replace damaged open or
shorted harness (WP 0110 00,
WP 0111 00, and WP 0220
00).
6. Remove relay 3009-1 and test a. Replace damaged or faulty
(WP 0113 00). Check voltage
3009-1 relay (WP 0077 00).
(24V) and 3009-1 relay socket b. If no voltage (24V) is found at
pins 30 and 86 with the ignition
3009-1 pin 30, check circuit
ON (WP 0048 00-23).
breaker F41 (1) and continuity
of wires A51B, A51J and
A1861A (WP 0048 00-23).
c. Check operation of relay 315-
1 (WP 0048 00-23). Replace
damaged or faulty 315-1 relay
(WP 0077 00 and WP 0222
00).
0013 00-7
