Isuzu 4JA1 Workshop Manual page 294

6E-40 Engine Control System (4JH1)
Scan Tool Output Controls
scan tool Output
Control
EGR Solenoid Valve
Engine Speed (RPM)
Control
Glow Indicator
Glow Relay
Malfunction Indicator
Lamp
Additional Menu
Selection(s)
The purpose of this test is for checking whether the EGR valve is correctly
moved with command. Restricted valve movement by foreign materials,
Solenoids excessive deposits, a faulty vacuum hose routing, a faulty EGR valve or a
faulty EGR solenoid could be considered if the mass air flow (MAF) sensor
is not changed when commanded ON or OFF.
The purpose of this test is for checking whether the actual engine idle

speed can change to match the commanded RPM.
The purpose of this test is for checking whether the glow indicator lamp is
Lamps operating when commanded ON. Faulty circuit(s) or an open circuit could
be considered if not operating when commanded ON.
The purpose of this test is for checking whether the glow relay is operating
Relays when commanded ON. Faulty circuit(s) or a faulty glow relay could be
considered if not energizing when commanded ON.
The purpose of this test is for checking whether the malfunction indicator
Lamps lamp (MIL) is operating when commanded ON. Faulty circuit(s) or an open
circuit could be considered if not operating when commanded ON.
Descriptions