MPI – Troubleshooting
13-15
Code No. 44 Ignition coil and power transistor unit system Probable cause
Range of Check
D Engine speed is approx. 50 – 4,000 r/min.
D Engine is not being cranked.
Set conditions
D Abnormal engine speed is detected due to misfiring by crank angle sensor. (One
of two coils fails.)
D Malfunction of the ignition coil
D Improper connector contact, open circuit or
short-circuited harness wire of the ignition primary
circuit
D Malfunction of the engine-ECU.
NG
Check the harness wire between the ignition coil and ignition switch
connector, and repair if necessary.
2. NG
OK
Replace the engine-ECU.
3. NG
NG
Check the following items.
D Check the spark plugs and spark plug cables.
D Check the compression pressure.
OK
Check trouble symptom.
OK
Check the following
connectors:
A-110, A-111
NG
Repair
NG
Check the harness wire
between the engine-ECU
and ignition coil connec-
tor.
NG
Repair
OK
Check trouble symptom.
Check the following
connector:
B-59
NG
Repair
OK
Check trouble symptom.
OK
Measure at the ignition coil connectors A-110, A-111.
D Disconnect the connector, and measure at the harness.
1. Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
2. Voltage between 3 and earth (Engine: Cranking)
OK: 0.5 – 4.0 V
3. Continuity between 2 and earth
OK: Continuity
1. NG
Check the following
connectors:
B-65, B-76
NG
Repair
Check the ignition coil. (Refer to Group 16 – Ignition System.)
NG
Replace
Check the harness wire between the ignition coil connector and
earth, and repair if necessary.
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