EN(H4SO)(diag)-77
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK IGNITION SYSTEM FOR SPARKS.
1) Remove the plug cord cap from each spark
plug.
2) Install a new spark plug on plug cord cap.
CAUTION:
Do not remove the spark plug from engine.
3) Contact the spark plug thread portion to
engine.
4) While opening the throttle valve fully, crank
the engine to check that spark occurs at each
cylinder.
Does spark occur at each cylin-
der?
Check fuel pump
system. <Ref. to
EN(H4SO)(diag)-
79, FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
Go to step
2
.
2
CHECK POWER SUPPLY CIRCUIT FOR IG-
NITION COIL AND IGNITOR ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ignition
coil and ignitor assembly.
3) Turn the ignition switch to ON.
4) Measure the voltage between ignition coil
and ignitor assembly connector and engine
ground.
Connector & terminal
(E12) No. 2 (+) — Engine ground (–):
Is the voltage 10 V or more?
Go to step
3
.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ignition coil and ig-
nitor assembly and
IG relay connector
• Poor contact of
coupling connector
• Blown out of fuse
3
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL AND IGNITOR ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM and
the ignition coil and ignitor assembly connector.
Connector & terminal
(E12) No. 3 — (B137) No. 6:
(E12) No. 3 — (B137) No. 26:
Is the resistance less than 1
:
? Go to step
4
.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and ignition
coil and ignitor as-
sembly connector
• Poor contact of
coupling connector
4
CHECK IGNITION COIL AND IGNITOR AS-
SEMBLY.
1) Remove the spark plug cords.
2) Measure the resistance between spark plug
cord contact portions to check secondary coil.
Terminals
No. 1 — No. 2:
No. 3 — No. 4:
Is the resistance between 10 and
15 k
:
?
Go to step
5
.
Replace the igni-
tion coil and ignitor
assembly. <Ref. to
IG(H4SO)-6, Igni-
tion Coil and Ignitor
Assembly.>
5
CHECK INPUT SIGNAL FOR IGNITION COIL
AND IGNITOR ASSEMBLY.
1) Connect the connector to the Ignition coil
and ignitor assembly.
2) Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil and ignitor assem-
bly connector and engine ground.
Connector & terminal
(E12) No. 1 (+) — Engine ground (–):
(E12) No. 4 (+) — Engine ground (–):
Does the voltage vary 10 V or
more?
Go to step
6
.
Replace the igni-
tion coil and ignitor
assembly. <Ref. to
IG(H4SO)-6, Igni-
tion Coil and Ignitor
Assembly.>
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