12-48 FI SYSTEM DIAGNOSIS
“23” (P1651-H/L) TO SENSOR CIRCUIT MALFUNCTION
NOTE:
After repairing the trouble, clear the DTC using SDS tool. (12-21)
INSPECTION
Step 1 (When indicating 23:)
1) Stop the engine.
2) Remove the fuel tank. (13-2, -3)
3) Check the TO sensor coupler 1 for loose or poor contacts.
If OK, then measure the TO sensor resistance.
DETECTED CONDITION POSSIBLE CAUSE
23
The sensor voltage should be the follow-
ing for 1 second and more.
0.17 V Sensor voltage < 4.73 V
• TO sensor circuit open or short.
• TO sensor malfunction.
• ECM malfunction.
P1651
H
Sensor voltage is higher than specified
value.
• TO sensor circuit shorted to VCC or ground circuit
open.
• TO sensor circuit open or shorted to ground or
VCC circuit open.
L
Sensor voltage is lower than specified
value.
ECM
E2
TOS
R/Bl
B/Br
VCC
TO sensor
Br/W
When using the multi circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle-pointed tester probe to prevent the terminal damage or terminal bend.
1
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