1A-29 Engine General Information and Diagnosis:
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. Refer to “Fuel Tank
Removal and Installation in Section 1G (Page 1G-9)”.
3) Check the CMP sensor coupler (1) for loose or poor
contacts.
If OK, remove the CMP sensor. Refer to “CMP Sensor
Removal and Installation in Section 1C (Page 1C-2)”.
4) Connect 3 new 1.5 V batteries in series, 1 kΩ resistor
and the multi-circuit tester as shown in the figure.
Special tool
09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
5) Under this condition, if a suitable screwdriver touching
the pick-up surface of the CMP sensor is moved, the
tester reading voltage changes (0.8 V and less ↔ 4.3 V
and more).
Is the voltage OK?
• B/Y, R or B/Br wire
open or shorted to
the ground.
• Loose or poor
contacts on the CMP
sensor coupler or
ECM coupler
(Terminal “11”, “13” or
“29”).
• If wires and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again.
• Inspect that metal
particles or foreign
material stuck on the
CMP sensor and
camshaft tip.
• If there are no metal
particles and foreign
material, then replace
the CMP sensor with
a new one.
1
I815H1110023-01
1 kΩ
W
Bl/Y
B/Bl
(+)(–)
I823H1110005-04
I823H1110007-01
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