1. ECM / PCM coupler disconnected
2. Ohmmeter
ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM)
6-27
Resistance Check
1) Disconnect couplers from ECM / PCM with ignition switch OFF.
CAUTION:
Never touch terminals of ECM / PCM itself or connect
voltmeter or ohmmeter.
2) Check resistance between each pair of terminals of discon-
nected couplers as listed in the following table.
CAUTION:
D
Be sure to connect ohmmeter probe from wire harness
side of coupler.
D
Be sure to turn OFF ignition switch for this check.
D
Resistance in table represents that when parts temper-
ature is 20
_
C (68
_
F).
TERMINAL
CIRCUIT
STANDARD
RESISTANCE
CONDITION
C51-2 to C51-30
Fuel injector No.1
Max. 0.6
Ω
—
C51-5 to C51-6
Fuel injector No.2
Max. 0.6
Ω
—
C51-3 to C51-31
Fuel injector No.3
Max. 0.6
Ω
—
C51-4 to C51-32
Fuel injector No.4
Max. 0.6
Ω
—
C51-14 to C51-41
CKP sensor
315 – 405
Ω
At 20
_
C (68
_
F)
C51-22 to C51-39
Fuel temp. sensor
Refer to “FUEL TEMPERATURE SENSOR” in Section
SE3.
C51-29 to C51-50
Fuel pressure regulator
2 – 3
Ω
At 20
_
C (68
_
F)
C51-45 to C51-46
ECT sensor
Refer to “ECT SENSOR” in Section 6E3.
C51-33 to Body ground
Ground
Continuity
—
C51-49 to Body ground
Ground
Continuity
—
C51-51 to Body ground
Ground
Continuity
—
C51-53 to Body ground
Ground
Continuity
—
