Inspection; Precaution On System Inspection; Inspection For Ecm Circuit Voltage - Suzuki DF 40 Service Manual

3-33 ENGINE CONTROL SYSTEM

INSPECTION

PRECAUTION ON SYSTEM INSPECTION

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.
• 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

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 –
09930-89920 : 6-pin test cord –
09930-89930 : 8-pin test cord –
09930-89940 : 12-pin test cord –
09930-99320 : Digital tester
Tester range :
(1) Turn ignition switch OFF.
(2) Connect the test cord
harness as shown.
(3) Connect the tester probe
measure voltage according to the "CIRCUIT VOLTAGE
TABLE".
V (DC voltage)
, , or between ECM and wire
(Black) to body ground, and
A B C D E
ECM