3-33 ENGINE CONTROL SYSTEM
INSPECTION
PRECAUTION ON SYSTEM INSPECTION
A
To prevent an unexpected engine start, perform the following before proceeding with any CRANK-
ING tests.
• When performing tests not related to fuel injector operation :
• Disconnect all fuel injector wire connectors.
• When performing tests related to fuel injector operation :
• Relieve fuel pressure in line. (See page 5-2.)
• Disconnect high pressure fuel pump wire connector located on fuel vapor separator.
B
• Always turn ignition switch “OFF” and disconnect battery cables when wires are being discon-
nected or connected.
• Hold and pull connector pieces when disconnecting. Do not pull wires.
NOTE:
• The self-diagnostic code memory in ECM will remain even if battery is disconnected.
• As each terminal voltage is affected by battery voltage, use a full-charged battery.
• Make sure all ground points have good electrical contact.
• Make sure all wires/cables are securely connected.
INSPECTION FOR ECM CIRCUIT VOLTAGE
B
ECM cannot be bench checked. It is strictly prohibited
to connect any tester (voltmeter or ohmmeter) to an
ECM separated from the engine wiring harness.
09930-89910 : 4-pin test cord – 1
09930-89920 : 6-pin test cord – 2
09930-89930 : 8-pin test cord – 3
09930-89940 : 12-pin test cord – 4
09930-99320 : Digital tester
Tester range :
--
--
- V (DC voltage)
(1) Turn ignition switch OFF.
(2) Connect the test cord 1,2,3 or 4 between ECM and wire
harness as shown.
(3) Connect the tester probe - (Black) to body ground, and
measure voltage according to the “CIRCUIT VOLTAGE
TABLE”.
z
s
ECM
E
DC
B
A
1
4
2
3
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