ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-91
DTC P0131 O2 Sensor (HO2S) Circuit Low Voltage (Sensor-1)
DTC P0132 O2 Sensor (HO2S) Circuit High Voltage (Sensor-1)
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1. Relay box 4. Circuit fuse box 7. Heater 10. To other sensor
2. Shield wire 5. “IG COIL” fuse 8. To HO2S–2 heater
3. Ignition switch 6. HO2S–19.ECM
E23 E22 E21
12345671234561234567
7
891011121314151617 8910111213141516 891011121314151617
1819
1819
1718192021222324252627 20212223 202122232425 24252627 2627
2829303132 32 282930 28293031 3133 33 323334 3435 3435
BLK/WHTBLK/WHT
WHT/BLU
80A
60A
BLU/BLK
YEL
RED
BRN/WHT BRN/WHT
BLK/WHT
BLK/WHT
E21-28
E23-4
E22-11
E22-28
9
6
2
7
5
4
1
3
8
10
DTC Detecting Condition Trouble Area
DTC P0131:
• HO2S voltage is higher than 4.5 V even after engine run-
ning for specified time continuously from engine start
• Maximum HO2S voltage is less than 0.6 V or minimum
HO2S voltage is less than 0.3 V (2 driving cycle detection
logic)
DTC P0132:
• HO2S voltage is less than 3.0 V even after engine running
for specified time continuously from engine start
• Maximum HO2S voltage is 0.74 V or more or minimum
HO2S voltage is 0.34 V or more (
✱
2 driving cycle detection
logic, monitoring once/1 driving)
• HO2S–1 sensor circuit
• HO2S–1 sensor
• Fuel system
• ECM
• Fuel shortage
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 person, a driver and tester, on a level road.
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