Inspect The Glow Control Unit Power Supply Circuit; Inspect The Gcu Harness - Hino Motors HINO 155 series Workshop Manual

3

Inspect the glow control unit power supply circuit

+B
GND
BATT
Do the measurements meet the standard value?
Go to step 4.
4

Inspect the GCU harness

V15
A
V35
Sl
Do the measurements meet the standard value?
Go to step 5.
ENGINE (J05E)/TROUBLESHOOTING
1. Set the starter key to the "ON" position.
2. Use the electrical tester to measure the voltage between the termi-
nals of the GCU vehicle side connector.
Starter key: ON
SHTS021270300610
YES
1. Set the starter key to the "LOCK" position.
2. Connect the signal check harness to the engine ECU vehicle side
harness. (Do not connect the harness to the ECU.)
3. Use the electrical tester to measure the resistance between the
terminals of the GCU vehicle side connector and engine ECU.
DI
SHTS021270300611
Starter key: LOCK
YES
Measurement Tester
conditions connections
GCU vehicle side
connector
+B – GND
BATT – GND
Inspect the GCU ground circuit.
Perform "After-inspection work" of INFOR-
MATION section.
Measurement Tester
conditions connections
GCU vehicle side
connector –
Engine ECU (sig-
nal check har-
ness)
DI – Dl (V35)
Sl – ST (V15)
Repair or replace the harness.
Perform "After-inspection work" of INFOR-
MATION section.
2–669
Standard values
10 – 16 V
NO
Standard values
Less than 1 
NO