How To Troubleshoot Circuits At The Ecm; How To Substitute The Ecm For Testing Purposes - Honda S2000 Service Manual

How to Troubleshoot Circuits at the ECM
Special Tools Required
. Digital multimeter KS-AHfvl-32-003 (1)or a
c o m m e r c i a l l y a v a i l a b i e d i g i t a l m u l t i m e t e r
. Backprobe Set 07SAZ-0010004 (2)
1. Connect the backprobe adapters (A)to the stacking
patch cords (B), and connect the cords to a
m u l t i m e t e r ( C ) .
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U s i n g t h e w i r e i n s u l a t i o n a s a g u i d e f o r t h e
contoured tip ofthe backprobe adapter, gently slide
the tip into the connector from the wire side until it
touches the end of the wire terminal.
lf you cannot get to the wire side of the connector
or the wire side is sealed (A), disconnect the
connector and louch the tester probe (B) to
terminals (C) from the terminal side. Do not force
the probe into the connector.
D o n o t p u n c t u r e t h e i n s u l a t i o n o n a w i r e .
Punctures can cause poor or intermittent
electrical connections.
07sAz-001000A
How to Substitute the ECM for Testing
Purposes
Use this procedure if you need a known-good ECM to
test a vehicle. lt allows you to swap a ECM from a
"donor" vehicle without having to program it to the test
vehicle's ignition key.
1. Disconnect the negative cable from the battery on
the test vehicle.
2. Cut a temporary ignition key for the lest vehicle
w i t h a n o n - i m m o b i l i z e r k e y b l a n k .
3. Remove the ECM from the test vehicle.
4. \N r'rte the test v ehic\e' s \,1\N on the ECM y ou iust
removed to avoid confusing it with the donor
vehicle's ECM.
5. Disconnectthe negative cable from the battery on
t h e d o n o r v e h i c l e .
6. Remove the known-good ECM from the donor
vehicle, and install it in the test vehicle.
7. Tape the donor vehicle's ignition key head-to-head
to the test vehicle's temporary key (A). The ECM
will recognize the code from the donor vehicle's
k e y ( B ) a n d a l l o w y o u t o s t a n t h e e n g i n e w i t h t h e
temporary key.
After completing your tests, reinstall both ECMs,
and destroy the temporary key.
Reconnect the negative cable to the battery.
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