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TRBL
SHTG
Diagnos-
Item
tic code
Overheat
252
warning
Low oil
pressure
253
warning
WD: Refer to the wiring diagram.
*:
Disconnect the sensor coupler or switch coupler, and then check that there is no short circuit at the
coupler (wiring harness end).
Engine unit troubleshooting
Symptom
Engine speed
is limited
Engine speed
is limited
Checking steps
1. Check the cooling water passages for
obstructions.
2. Measure the engine temperature sen-
sor resistance.
3. Check that there is no short circuit
between the black/yellow (B/Y) and
black/orange (B/O) engine tempera-
ture sensor wiring harness leads*.
4. Check the thermoswitch for continuity.
5. Check that there is no short circuit
between the pink (P) and black/orange
(B/O) thermoswitch wiring harness
leads*.
6. Measure the thermo sensor resis-
tance.
7. Check that there is no short circuit
between the black/blue (B/L) and
black/orange (B/O) thermo sensor wir-
ing harness leads*.
1. Check the oil pressure switch for conti-
nuity.
2. Check that there is no short circuit in
the pink/white (P/W) oil pressure
switch wiring harness lead*.
3. Check the oil passages for obstruc-
tions.
9-15
E
Refer
to
page
2-18
1
7-22
WD
2
7-19
WD
3
7-21
WD
4
7-18
5
WD
2-17
6
7
8
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