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Check No. 4
1. From the setup of Check 3, remove the
jumper wire. Disconnect the tester ground lead
from the module ground terminal. Using a
jumper wire, connect the module ground lead
to the negative terminal of the battery . Plug
the
J-24642-101
resistor-connector
(or
equivalent) into the 3-way connector as shown
in figure 7 .
2 . Press the "TEST" button and observe the
lights.
RED "REPLACE" light should come
on and stay on .
If GREEN "GOOD" light comes on
while the button is pressed, the tester
is defective.
When
the tester has passed these four
checks, its proper operation is verified. You
may now begin diagnosis of the high energy
ignition system.
TESTING PROCEDURE FOR HEI
MODULE USING TESTER J-24642
The module tester provides the means of
checking the HEI module in or out of the
vehicle . It operates by generating a signal
equivalent to the pick-up coil signal, measur-
ing the output of the HEI module and deter-
mining whether or not it is within the specified
range.
There are three tests and some sub-
tests performed by . the tester. TEST 1 is used
if the vehicle does not run, TEST 2 if the
vehicle runs but not satisfactorily, and TEST 3
if the module is out of the vehicle and must be
checked . In all tests, the battery must be fully
charged. Low voltage or slow cranking speeds
will result in a false "REPLACE" indication.
Test No . 1 - CRANK TEST, Distributor Cap in
Place (Engine does not run) (Figure 8)
1 . Disconnect (pull) module 3-way harness
connector from its socket in the side of the
distributor cap .
2 . Connect 3-way connector of tester J-
24642 to the module harness connector.
NOTE: The 3-way connector should connect
only one way to the module connector.
Match
wire
colors
between
module
connector and tester 3-way connector.
3 . Connect red lead of tester J-24642 to
battery positive (+) terminal and black lead to
battery negative (-) terminal .
4. Crank engine, press and hold "TEST"
button.
NOTE : During cranking, battery voltage
must be 9 volts or more and engine speed
100 rpm or more for tester to be accurate.
ENGINE ELECTRICAL 6Y-13
J 14642101
RESISTOR
CONNECTOR
MODULE
JUMPER CLIP
S
MODULE GROUND TERMINAL
A-6178
Figure 7-Check No . 4 with J-24642-101
5 . A momentary indication on the red "RE-
PLACE" light and then a steady indication on
the green "GOOD" light means that both the
HEI module and the pick-up coil are good .
GREEN LEAD
CLIP
WHITE LEAD
CLIP
MODULE HARNESS CONNECTOR
A-6174
Figure 8-Test No . 1, Using Tool J-24642 (Crank Test)
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