Engine General Information and Diagnosis: 1A-35
Self-Diagnostic Code “1 – 1” Rectifier/Regulator (Over Charging)
Z9J0111104015
NOTE
• This self-diagnostic code indication may be canceled when turning the ignition switch “ON” (engine
not running), because ECM detects battery voltage.
• It is difficult to thoroughly check the rectifier/regulator. Before replacing it with new one, check that
the ground point has good electrical contact.
Troubleshooting
Self-Diagnostic Code “5 – 3” Oil Pressure Switch
Z9J0111104016
Wiring Diagram
Troubleshooting
For step 1
Step Action Yes No
1 1) Check the Rectifier/Regulator resistance.
Refer to “Rectifier/Regulator Inspection” in Section 1K
(Page 1K-8).
Is the result OK?
Go to step 2. Faulty Rectifier/
Regulator.
2 1) With the engine running, check charging voltage at idle
speed.
Is the result 16 V or higher?
Faulty Rectifier/
Regulator.
Faulty ECM or wire
continuity / connection
failure.
1. Oil pressure switch
ECM
Bl
C
P
U
1
I9J011110063-01
Step Action Yes No
1 1) With the ignition switch “OFF”, remove the oil pressure
switch wire.
2) With the ignition switch “ON”, check the voltage between
the oil pressure switch wire terminal and body ground.
Is the voltage approx. 5 V?
Go to step 2. • Oil pressure switch
wire open or poor
connection.
• If wire and
connection are OK,
substitute a known-
good ECM and
recheck.
2 1) Check the oil pressure switch operation.
Refer to “Oil Pressure Switch Inspection” in Section 1E
(Page 1E-6).
Is it in good condition?
Poor oil pressure switch
wire connection,
intermittent trouble or a
faulty ECM may be the
cause.
Faulty oil pressure
switch.
I9J011110064-01
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