MPI – Troubleshooting
13-12
Code No. 23 Camshaft position sensor system Probable cause
Range of Check
D Ignition switch: ON
D Engine speed is approx. 50 r/min or more.
Set conditions
D Sensor output voltage does not change for 4 seconds (no pulse signal input.)
D Malfunction of the camshaft position sensor
D Improper connector contact, open or short-circuited
harness wire of the camshaft position sensor circuit
D Malfunction of the engine-ECU
Measure at the camshaft position sensor connector A-97.
D Connect the connector.
D Voltage between 2 and earth (Engine: cranking)
OK: 0.4–3.0 V
D Voltage between 2 and earth (Engine: idling)
OK: 0.5–2.0 V
OK
Replace the engine-ECU.
NG
Measure at the camshaft position sensor connector A-97.
D Disconnect the connector, and measure at the harness side.
1. Voltage between 3 and earth (Ignition switch: ON)
OK: System voltage
2. Voltage between 2 and earth (Ignition switch: ON)
OK: 4.8–5.2 V
3. Continuity between 1 and earth
OK: Continuity
1. NG
Check the harness wire between the camshaft position sensor
and the control relay connector, and repair if necessary.
2. NG
Check the following con-
nector: B-62
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and the camshaft position
sensor connector.
NG
Repair
OK
Replace the engine-ECU.
3. NG
Check the harness wire between the camshaft position sensor
and the earth, and repair if necessary.
OK
Check the following con-
nector: A-97
NG
Repair
OK
Check trouble symptom.
NG
Replace the camshaft position sensor.
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