6-2-122 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
4 MAP sensor check.
1) Check MAP sensor for performance referring to
“MAP Sensor Individual Check” in “DTC P0108”
Diag. Flow Table.
Is check result satisfactory?
Intermittent trouble or
faulty ECM
Check for intermittent
referring to “Intermit-
tent and Poor Connec-
tion Inspection” in
Section 0A.
Repair or replace.
5 EGR valve power supply circuit check.
1) With ignition switch turned OFF, disconnect EGR
valve coupler.
2) With ignition switch turned ON, check voltage
between “BLK/RED” wire terminal of EGR valve cou-
pler and engine ground.
Is each voltage 10 – 14 V?
Go to Step 6. Faulty “BLK/RED”
wire.
6 Check wire circuit.
1) Measure voltage between engine ground and each
“GRN/YEL”, “GRN/BLK”, “BLK/RED” and “GRN/
ORN” wire terminal of EGR valve connector.
Is each voltage 0 V?
Go to Step 7. Some wire shorted
to other circuits.
If wires are OK,
substitute a known-
good ECM and
recheck.
7 Check wire circuit.
1) With ignition switch turned OFF, check that there are
insulating between engine ground and each “GRN/
YEL”, “GRN/BLK”, “BLK/RED” and “GRN/ORN” wire
terminal of EGR valve connector.
Are there insulating?
Go to Step 8. Some wire shorted
to ground circuit.
If wires are OK,
substitute a known-
good ECM and
recheck.
8 EGR valve stepping motor coil circuit check.
1) With ignition switch turned OFF, connect EGR valve
coupler and disconnect ECM couplers.
2) Check resistance between “E21-5/6” and “E23-17”,
“E23-34”, “E23-16”, “E23-33” wire terminal of ECM
connector.
Is each resistance 20 – 24
Ω
at 20°C, 68°F.
Go to Step 9. Faulty “GRN/YEL”,
“GRN/BLK”, “BLK/
RED” and “GRN/
ORN” wire or EGR
valve.
9 Check wire circuit.
1) Measure voltage between engine ground and each
“GRN/YEL”, “GRN/BLK”, “BLK/RED” and “GRN/
ORN” wire terminal of EGR valve connector.
Is each voltage 10 – 14 V?
Some wire in high
resistance circuit.
If wires are good con-
dition, faulty EGR
valve.
Some wire open
circuit.
If wires are good
condition, faulty
EGR valve.
10 MAP sensor check:
1) Check MAP sensor for performance referring to
“MAP Sensor Individual Check” in “DTC P0108”
Diag. Flow Table.
Is check result satisfactory?
EGR passage clogged
or EGR valve malfunc-
tion,
If all above are OK,
substitute known-good
ECM and recheck.
Repair or replace.
Step Action Yes No
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