30
Group 23 EDC III
Diagnostic function
102 Code 2.5
Cause:
RPM sensor, camshaft. No signal.
Response:
The engine takes longer than normal to
start. The engine runs normally once underway.
Corrective action:
•
Check that the tachometer sensor connector is fit-
ted correctly.
•
Check that the wiring to the tachometer sensor is
not damaged.
•
Check that the tachometer sensor is correctly fit-
ted in the upper timing cover.
•
Check the function of the tachometer sensor.
•
Check the contact pressure in sleeves 7 and 18
in the black cable glove of the engine control unit
(ECU).
103 Code 2.5
Cause:
RPM sensor, camshaft. Abnormal frequency.
Response:
The engine takes longer than normal to
start. The engine runs normally once underway.
Corrective action:
•
Check that the tachometer sensor connector is fit-
ted correctly.
•
Check that the wiring to the tachometer sensor is
not damaged.
•
Check that the tachometer sensor is correctly fit-
ted in the upper timing cover.
•
Check the function of the tachometer sensor.
23 Code 2.7
Cause:
RPM potentiometer connected to
engine con-
trol unit (ECU).
Interrupted or shorted to positive (+).
Response:
The engine goes to idle. If the pedal is re-
leased and then depressed again, the engine can
”limp home” using the idle contact.
Corrective action:
•
Check the the control’s connector is fitted correctly.
•
Check that the wiring to the sensor is not damaged.
•
Check the function of the sensor.
•
Check that the 23-pin connector is fitted correctly.
•
Check pin C and sleeve C in the 23-pin connector.
•
Check the contact pressure in sleeve 3 in the red
cable glove of the engine control unit (ECU).
24 Code 2.7
Cause:
RPM potentiometer connected to the engine
control unit (ECU). Short to negative (-).
Response:
The engine goes to idle. If the pedal is re-
leased and then depressed again, the engine can
”limp home” using
the idle contact.
Corrective action:
•
Check that the potentiometer is connected cor-
rectly.
•
Check that the wiring to the potentiometer is not
damaged.
•
Check the function of the potentiometer.
21 Code 2.8
Cause:
RPM potentiometer connected to CIU.
Short to negative (-).
Response:
The engine goes to idle. If the pedal is re-
leased and then depressed again, the engine can
”limp home” using the idle contact.
Corrective action:
•
Check that the potentiometer is connected cor-
rectly.
•
Check that the wiring to the potentiometer is not
damaged.
•
Check the function of the potentiometer.
22 Code 2.8
Cause:
RPM potentiometer connected to CIU.
Interrupted or shorted to positive (+).
Response:
The engine goes to idle. If the pedal is re-
leased and then depressed again, the engine can
”limp home” using the idle contact.
Corrective action:
•
Check that the potentiometer is connected cor-
rectly.
•
Check that the wiring to the potentiometer is not
damaged.
•
Check the function of the potentiometer.
