Using A Circuit Tester; Using A Signal Check Harness - Hino Motors HINO 155 series Workshop Manual

2–8
Computer (ECU) terminal No.
Example: V23 terminal
ENGINE (J05E)/TROUBLESHOOTING
4. AFTER COMPLETING THE MALFUNCTION ANALYSIS, ERASE
THE MALFUNCTION MEMORY STORED IN THE PAST. OTHER-
WISE, THE MALFUNCTION LIGHT IN THE DISPLAY WILL
REMAIN LIT.
5. CONNECTOR DRAWING, ALL OF WHICH HAS A VIEW TO BE
SEEN FROM THE CONNECTION SIDE, INSERT THE TESTING
LEAD FROM THE BACKSIDE.
6.

USING A CIRCUIT TESTER

• Use a circuit tester with an internal resistance of 100 k or
greater in the voltage measuring range.
7.

USING A SIGNAL CHECK HARNESS

• To prevent breakage of the ECU connector, connect the signal
check harness and perform measuring by bringing the test lead
into contact with the signal check harness side (contact box).
NOTICE
The terminal numbers in the text and in the illustrations corre-
spond to the table on the next page (computer pin assignment) as
shown below.
Main/
Starter cut relay Actuator power
Power supply 1
relay 1
V1 VF V2 STCR V3 MREL
Neutral switch Starter signal Starter switch 1
V11 NSW V12 STA V13 IGSW
Main/
- Actuator power
Power supply 2
relay 2
-
V21 VF2 V22 V23 MRL2
Engine stop
PTO switch 1 Starter switch 2
switch
V31 PTO V32 ESTP V33
A
Signal check
harness
(contact box)
V23
Computer (ECU) terminal signal
A
Exhaust brake
PTO cut relay
relay
V4 EXB V5 PTOC V6
Vehicle speed
-
communication
pulse converter
-
V14 SP1 V15 V16
Glow relay -
SREL -
V24 V25 V26
-
TACHO Pulse communication
-
IG V34 TAC V35 V36
Glow
-
(Indic
-
V7
CAN CA
commun
line lin
CANL V17
- Diagnos
-
V27
CAN CA
commun
line lin
CANH V37
A
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1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
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