Engine General Information and Diagnosis: 1A-115
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and
confirm that the trouble has been corrected.
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed?
Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Ignition spark check
1) Check that each spark plug sparks referring to “Ignition
Spark Test in Section 1H”.
Is check result satisfactory?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 3.
3 Ignition coil power, output and ground circuit check
1) Disconnect ignition coil connector of the cylinder found
as faulty in Step 2.
2) Check ignition coil circuit of the cylinder found as faulty
in Step 2 for the following.
• Voltage between power circuit wire terminal of ignition
coil connector and vehicle body ground is 10 – 14 V
with ignition switch turned ON.
• Voltage between output circuit wire terminal of ignition
coil connector and vehicle body ground is 4 – 6 V with
ignition switch turned ON.
• Resistance between ground circuit wire terminal of
ignition coil connector and vehicle body ground is less
than 2 Ω.
Are they in good condition?
Go to Step 4. Repair or replace
defective wire.
4 Ignition coil check
1) Replace ignition coil for No.1 and No.4 spark plugs with
ignition coil for No.2 and No.3 spark plugs.
Is the cylinder found as faulty in good condition now?
Faulty ignition coil. Go to Step 5.
5 Ignition coil output circuit check
1) Disconnect connectors from ECM.
2) Check ignition coil circuit of the cylinder found as faulty
in Step 2 for the following.
• Resistance of output wire circuit between ignition coil
connector and ECM connector is less than 2 Ω.
• Resistance of output wire circuit between ignition coil
connector and vehicle body ground is infinity.
Are they in good condition?
Substitute a known-
good ECM and recheck.
Repair or replace
defective wire.
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