Inspect The Main Relay Power Supply - Hino Motors HINO 155 series Workshop Manual

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Inspect the main relay power supply

V3
V23
Do the measurements meet the standard value?
Replace the engine ECU.
Perform "After-inspection work" of INFOR-
MATION section.
ENGINE (J05E)/TROUBLESHOOTING
1. Set the starter key to the "LOCK" position.
2. Connect the main relay.
3. Connect the signal check harness to the engine ECU vehicle side
harness. (Do not connect the harness to the ECU.)
4. Set the starter key to the "ON" position.
5. Use the electrical tester to measure the voltage between the
engine ECU (signal check harness) terminals and ground.
SHTS021270300645
Starter key: ON
YES
Measurement Tester
conditions connections
Engine ECU (sig-
nal check har-
ness)
MREL (V3) –
Ground
MRL2 (V23) –
Ground
Repair or replace the harness.
Perform "After-inspection work" of INFOR-
MATION section.
Standard values
10 V or more
NO