6-1-88 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Fig. 1 for Step 3 Fig. 2 for Step 4
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
2 Does speedometer indicate vehicle speed? Go to Step 3. Speedometer
cable disconnected
or broken.
3 Check VSS and Its Circuit.
1) Disconnect ECM connector with ignition switch OFF.
2) Check for proper connection to ECM (PCM) at terminal
C03-2.
3) If OK, then connect ohmmeter between terminal
C03-2 of ECM (PCM) connector and body ground.
4) Hoist front end of vehicle and lock front right tire.
5) Turn front left tire slowly.
Does ohmmeter indicator deflect between 0 and infinity a
few times while tire is turned one revolution?
See Fig. 1.
Intermittent trouble
or faulty ECM.
Check for
intermittent
referring to
“Intermittent and
Poor Connection”
in section 0A.
Go to Step 4.
4 Check VSS.
1) Remove combination meter.
2) Connect ohmmeter between “VSS” terminal and “GND”
terminal of combination meter and turn cable joint of
speedometer with a screwdriver. Ohmmeter indicator
should move back and forth between 0 and infinity
4 times while cable joint is turned one full revolution.
See Fig. 2.
Is it in good condition?
“P”, “Y/G” or “B/Bl”
wire open or short,
or poor connection.
Replace VSS.
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