Isuzu N-Series. Service manual — part 542
Engine Electrical 6D-35
Preheating System
Glow Plug Replacement
Circuit Diagram
Legend
1. Engine Control Switch
2. Generator (Integral Regulator)
3. Charge Relay
4. To Heater and A/C Relay
5. Low Charge Indicator Light
6. Glow Plug Relay
7. Glow Plugs
8. Glow Plug Indicator Light
9. ECM
10. Starter Cut Relay
11. To Exhaust Brake Solenoid Valve
12. Starter Relay
13. Starter
14. ECM Main Relay
Precautions during maintenance
Adequate care should be taken as over-tightening the
glow plug could lead to damage.
Removal
1. Remove the engine harness, the throttle position
sensor, the EGR valve, the pressure sensor, and
all of the fuel injector connectors.
2. Remove the EGR valve and the EGR adapter.
3. Tape the EGR case holes shut to prevent the entry
of foreign material.
N6A6586E
6D-36 Engine Electrical
Legend
1. EGR Adapter
2. EGR Valve
4. Remove the glow connector.
5. Remove the glow plug.
Installation
1. Install the glow plug.
Tighten:
Glow plug to 20 N
⋅m (2.0 kg⋅m/15 lb⋅ft)
2. Install and tighten the glow connector with the
designated torque.
Tighten:
Glow connector to 12 N
⋅m (1.2 kg⋅m/10 lb⋅ft)
3. Install the EGR valve and the EGR adapter.
Tighten:
EGR valve and adapter to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
Legend
1. EGR Adapter
2. EGR Valve Gasket
3. EGR Valve
4. EGR Valve Gasket
4. Attach the engine harness connectors. Each
composite connector should make a loud click
when it is securely attached.
Service Precautions
Adequate care should be taken as over-tightening the
glow plug could lead to damage.
Explanations on Functions and Operation
The preheating system consists the ECM, the glow
relay, glow plugs and the glow indicator lamp. The
preheating system is operated when the engine coolant
temperature is low, and make the engine easy to start.
Functional check
Refer to Section 6E (Glow Control System Check).
Except the glow plug.
Glow plug check
• Use the circuit tester and measure the resistance
of the glow plug.
• If the measured value deviates from the specified
value, then replace the glow plug.
Resistance value of glow plug is approximately
less than 6
Ω.
Caution:
Use a set of four glow plugs from the same
manufacturer.
N6A6368E
N6A6127E
N6A6371E
Engine Electrical 6D-37
A List of Defective Phenomena
• The glow indicator lamp does not light up.
• Preheating does not work.
• The preheating time is too long or too short.
Trouble Shooting
1. The glow indicator lamp does not light up.
2. Preheating does not work.
3. Preheating time is too long or too short.
Main Data and Specifications
N6A6429E
Condition
Possible Cause
Correction
The glow indicator lamp does not
light up.
Slow blow fuse has blown.
Replace the slow blow fuse.
Fuse is unavailable.
Replace the fuse.
Indicator valve is burnt out.
Replace the indicator valve.
Engine control system is faulty.
Refer to Section 6E.
Condition
Possible Cause
Correction
Preheating does not work.
Slow blow fuse has blown.
Replace the slow blow fuse.
Defective or faulty glow plug relay
connector contact.
Re-mount or replace the glow plug
relay.
Engine control system is faulty.
Refer to Section 6E.
Condition
Possible Cause
Correction
The Preheating time is too long or
too short.
Thermosensor fault and break in
circuit or short circuit.
Replace the thermosensor. Repair
the circuit.
Fault in glow plug.
Replace or tighten the glow plug.
Engine control system is faulty.
Refer to Section 6E.
Preheating device model
Glow plug
Glow plug rated voltage
(V)
24
Exhaust System 6F-1
ENGINE
Exhaust System
TABLE OF CONTENTS
EGR System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6F-2
EGR Valve and EGR Cooler . . . . . . . . . . . . . . . . . 6F-3
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . 6F-7
Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6F-9
Exhaust Brake System . . . . . . . . . . . . . . . . . . . . 6F-11
Exhaust Brake. . . . . . . . . . . . . . . . . . . . . . . . . . . 6F-12
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст