Error Messages and Codes 3-45
Reflective Sensor Procedure
Refer to the figure below during this procedure..
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
â– Reflective Sensor
â– Engine Control Board
Troubleshooting Procedure
Step Actions and Questions Yes No
1
1. Enter service diagnostics and run the
Reflective Sensor test.
2. Does the sensor change state from L
to H when blocked?
Replace the
sensor.
Go to step 2
2
1. Measure Pin 2 to ground.
2. Is there +5 VDC?
Go to step 4. Go to step 3.
3
1. Check the wire between Pin 2 and
engine control board Pin 8 for an open
circuit or poor contact.
2. Is the wiring OK?
Replace the
board.
Repair or replace
the wiring
harness.
4
1. Is there +5 VDC between sensor Pin 1
and Pin 3?
Replace the
sensor.
Go to step 5.
5
1. Is there +5 VDC between engine
control board Pin 4 and Pin 5?
Go to step 6. Replace the
engine control
board.
6
1. Check the wiring to Pin 4 and sensor
Pin 1 and Pin 5 to sensor Pin 3 for an
open or poor circuit.
2. Is the wiring OK?
Replace the
engine control
board.
Replace the
wiring harness.
7750-343
76
CONTROL
LOGIC
PWB
PL
PWB
PL
DC ROM
DC ROM
+5VDC
+5VDC
4
5
1
3
2
8
DOUBLE
PLUG
SENSOR
PL
J121
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