Suzuki Samurai 1986, Service Manual

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7) After it isconfirmed through steps 1) to 5) that oxygen sensor sends signals to ECM properly, check feed
back signal according to the following procedure. If feed back system operates properly, ECM should
send out feed back signal.
a) Connect an ohmmeter between terminal and body (ground). Be sure to connect positive (+) prod
of the ohmmeter to body (ground) and negative prod to terminal as shown in below figure
and never connect the other way around.
NOTE:
For this check, cancel switch must be OFF (“CHECK ENGINE” light off).
b) If indicator of ohmmeter deflects when connected as described in the above step, it means that ECM
sends out feed back signal, that is, feed back system operates properly.
NOTE:
If indicator doesn’t deflect at all, reverse connection (positive prod to terminal and negative prod to
body) and check.
In this state, turning ON cancel or check switch causes “CHECK ENGINE” light to flash. If “CHECK
ENGINE” light does not flash, wire harness, bulb of light or cancel/check switch may be defective.
8) After checking, install ECM to instrument main panel, and make sure coupler is connected to ECM
securely.
r
1. ECM
2. Coupler (Connected to ECM)
Oxygen sensor
Sealed wire
5. (Brown/Black) lead wire
6. Cancel switch (OFF position)
“CHECK ENGINE” light
8. Ignition switch
9. Battery
Canadian specification vehicle
U.S.A. specification
vehicle
10. Mileage sensor
11. Check switch
Fig. 5-3-45 Checking feed back signal
5-34