3-48 ENGINE CONTROL SYSTEM
INSPECTION
PRECAUTION ON SYSTEM INSPECTION
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!
NOTE:
• The self-diagnostic codes 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.
26-PIN & 34-PIN TEST CORD
This test cord is used when checking the circuit for voltage, etc. and connected between ECM and the wiring
harness.
To measure, connect the tester probe to the relevant terminal of the test cord.
" 09930-89340: 26-pin & 34-pin test cord
To prevent any unexpected engine start, perform the following before proceeding with any
CRANKING 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 5-3.)
•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 dis-
connected or connected.
• Hold and pull connector pieces when disconnecting. Do not pull wires.
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(White connector)
(White connector)
(Black connector)
(Black connector)
ECM
Wire harness
34 pin test cord
26 pin test cord
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