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5-21
BF135A•BF150A
8. Function test
-1. Turn the ignition switch OFF and connect the HDS
pocket tester.
-2. Turn the ignition switch ON and perform the function
test. (See the HDS pocket tester's operation manual for
the test procedure.)
Does the MIL blink?
YES –
Substitute a known-good ECM and recheck.
NO –
Check the MIL.
If the MIL is normal, repair the main wire har-
ness (open in the Red/Blue wire between the
MIL and ECM).
• MIL Comes ON but DTC Code
Does Not Appear
1. ECM power line check
-1. Turn the ignition switch OFF and disconnect the ECM
connector C.
-2. Turn the ignition switch ON. Measure the voltage
between the respective terminals of the No. 2
(Yellow/Black) and No. 6 (Yellow/Black) terminals of the
ECM connector C and the engine ground.
Is there the battery voltage?
YES –
Perform “2. Data link connector check”.
NO –
Repair open in the main harness.
2. Data link connector check
-1. Turn the ignition switch OFF and disconnect the HDS
pocket tester.
-2. Turn the ignition switch ON. Measure the voltage
between the No. 4 (Yellow/Red) terminal of the data
link connector and the engine ground.
Is there the battery voltage?
YES –
NO –
Repair open in the main harness.
VIEWED FROM THE
TERMINAL SIDE
DATA LINK CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
ECM CONNECTOR C
IGP2
(YELLOW/BLACK)
IGP1
(YELLOW/BLACK)
YELLOW/RED