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6-96 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
5
EGR Valve Power Supply Circuit Check :
1) With ignition switch OFF, disconnect EGR
valve coupler.
2) With ignition switch ON, check voltage
between terminal 2 and ground terminal 5 of
EGR valve connector and ground.
Is each voltage 10 – 14 V?
6
EGR Valve Stepper Motor Coil Circuit Check :
1) With ignition switch OFF, connect EGR
valve coupler and disconnect ECM cou-
plers.
2) Check resistance between C41-5 and C41-
2, 9, 8, 17 (Case of TYPE A. See NOTE) or
C42-17, 18, 28, 29 (Case of TYPE B. See
NOTE).
Is each resistance 20 – 24 Ω at 20°C, 68°F?
7
MAP sensor Check :
1) Check MAP sensor for performance refer-
ring to Section 6E1.
Is check result satisfactory?
Fig. 1 for Step 5
Action
1. EGR valve connector
Yes
Go to Step 7.
Go to Step 8.
EGR passage clogged or
EGR valve malfunction. If
all above are OK, intermit-
tent trouble or faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
No
Faulty "BLK/RED" wire.
Faulty "GRN" (Case of
TYPE A. See NOTE) or
"GRY" (Case of TYPE B.
See NOTE), "GRN/ORN",
"WHT/RED", "BRN/YEL"
wire or EGR valve.
Repair or replace.
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