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TROUBLESHOOTING
Check the condition of the wiring harness and connectors before checking the sensors or switches.
Note
Make the system inspection first. If no problem is found, continue with the next system
inspection of the Troubleshooting Guide. (Refer to pages 4A—8 and 9.)
Possible cause
Page
Checking order
Solenoid
EGR
EGR
valve
modula
control
(EGR)
tor valve
, valve
4A—72 4A—101 4A—101 4A—90
4A—71
4A—72
4
3
2
System Inspection
1. Start the engine.
2. Accelerate the engine and verify that the di
aphragm of the EGR control valve does not move
while the engine is still cold.
3. Warm up the engine to normal operating temper
ature and run it at idle.
Warning
Be careful when checking the EGR control
valve because the surrounding area is very
hot.
4. Accelerate the engine and check that the di
aphragm of the EGR control valve moves upward.
Solenoid Valve (EGR)
1. Disconnect the vacuum hose from the solenoid
valve and vacuum pipe.
2. Blow through the solenoid valve from vacuum hose
A.
3. Check that air flows from port B.
86U04A-131
626, MX-6 Revised 10/87
EGR SYSTEM
Water
Water
Engine control
unit terminal
thermo
thermo
sensor
switch
1H
6
5
7
4A
System
inspec
tion
2N
4A—92
4A—71
1
8
86U04A-129
4 A—71
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Table of Contents
Troubleshooting
