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TRBL
SHTG
Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, or limited
engine speed
Symptom 2
Spark plug does not
spark
(some cylinders)
High-pressure fuel
line malfunction
(fuel pressure is
low)
Fuel not supplied
(some cylinders)
Low compression
pressure
*1: See the wiring diagram.
9-19
Troubleshooting
Cause 1
Spark plug malfunc-
tion
Short,
open,
or
loose connection in
ignition coil circuit
Ignition
coil
mal-
function
ECM malfunction
Pressure regulator
malfunction
High-pressure fuel
pump malfunction
Fuel injector mal-
function
Short,
open,
or
loose connection in
fuel injector circuit
ECM malfunction
Clogged fuel injec-
tor filter
Scratched piston
Damaged valve
Valve stuck to valve
guide
Cause 2
Checking step
Check the ignition
spark.
—
Check
plugs.
Check the wiring
—
harness continuity.
Change the ignition
—
coil and check the
ignition spark.
Change the ignition
—
coil and check the
ignition spark.
Check the pressure
—
regulator.
Check
—
pressure fuel pump
continuity.
Check
injector operation.
—
Check
injector resistance.
Check the wiring
—
harness continuity.
Change the fuel injec-
—
tor and check the fuel
injector operation.
Replace
—
injector.
Check the compres-
sion pressure.
—
Disassemble
check
unit.
Refer
to
page
3-7
8-15
the
spark
*1
8-15
8-15
4-8
the
high-
8-31
the
fuel
8-30
the
fuel
*1
4-26
8-30
the
fuel
4-26
5-1
and
the
power
6P23H11
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Chapters
Table of Contents
Troubleshooting
