6-2-126 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
Troubleshooting
WARNING:
In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area
and away from any open flames such as gas hot water.
Step Action Yes No
1Was “Engine and Emission Control System
Check” performed?
Go to Step 2. Go to “Engine and Emis-
sion Control System
Check”.
2 Check EVAP canister purge power supply cir-
cuit.
1) Turn OFF ignition switch, disconnect con-
nector from EVAP canister purge valve.
2) Measure voltage between engine ground
and “BLK/RED” wire terminal of EVAP can-
ister purge valve connector with ignition
switch turned ON.
Is it voltage 10 – 14 V?
Go to step 3. “BLK/RED” wire open cir-
cuit.
3 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between “E23-13” ter-
minal of ECM connector and vehicle body
ground.
Is resistance infinity?
Go to Step 4. “RED/BLK” wire shorted
to ground circuit.
4 Check wire circuit.
1) Measure voltage between “E23-13” terminal
of ECM connector and vehicle body ground.
Is voltage 0 V?
Go to Step 5. “RED/BLK” wire shorted
to others circuit.
5 Check wire circuit.
1) Connect connector to purge control valve
with ignition switch turned OFF.
2) Remove ECM from vehicle body and then
connect connectors to ECM.
3) Turn ON ignition switch, measure voltage
between “E23-13” terminal of ECM connec-
tor and vehicle body ground.
Is it voltage 10 – 14 V?
Go to Step 6. “RED/BLK” wire open cir-
cuit.
6 Check EVAP canister purge control valve.
1) Check EVAP canister purge control valve
referring to “Evaporative Emission Control
System Inspection” in Section 6E2.
Is it in good condition?
Go to Step 7. Faulty EVAP canister
purge control valve.
7 Check EVAP canister purge control circuit.
1) With ignition switch turn OFF, measure
resistance between “E21-5/6” terminal and
“E23-13” terminal of ECM connector.
Is resistance below 40
Ω
at 20°C, 68°F?
Faulty ECM, substitute a
known-good ECM and
recheck.
“BLK/RED” and/or “RED/
BLK” wire in high resis-
tance circuit.
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