Engine General Information and Diagnosis: 1A-114
9 A/F sensor adjusting resistor power /ground circuit
check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check for proper connection to A/F sensor connector.
3) If connections are OK, check A/F sensor adjusting
resistor circuit for the following.
• ECM 5 V power is applied to A/F sensor adjusting
resistor circuit at A/F sensor connector (power circuit
check)
• Resistance between ground to ECM for A/F sensor
adjusting resistor circuit and vehicle body ground is
less than 1 Ω at A/F sensor connector (ground circuit
check)
Is it in good condition?
Go to step 11. Go to Step 10.
10 A/F sensor adjusting resistor circuit check
1) Disconnect connector from ECM with ignition switch
turned OFF.
2) Check for proper connection of each A/F sensor circuit
terminal to ECM connector.
3) If connections are OK, check A/F sensor adjusting
resistor circuit for the following.
• Resistance of each A/F sensor adjusting resistor
circuit wire between A/F sensor connector and ECM
connector is less than 3 Ω (continuity check)
• Resistance between A/F sensor adjusting resistor
circuit wires are infinity (no continuity check)
• Resistance between each A/F sensor adjusting
resistor circuit wire and vehicle body ground is infinity
(ground short check)
• Voltage between each A/F sensor adjusting resistor
circuit wire and vehicle body ground is 0 V with
ignition switch tuned ON (power short check)
Is it in good condition?
Substitute a known
good ECM and recheck.
Repair or replace
defective circuit.
11 A/F sensor adjusting resistor check
1) 1)Check for resistance of A/F sensor adjusting resistor
referring to “Air Fuel Ratio (A/F) Sensor On-Vehicle
Inspection: in Section 1C”.
Is check result satisfactory?
Go to Step 12. Replace A/F sensor.
12 A/F sensor for performance check
1) Check A/F sensor referring to Step 3 and 4 of “DTC
P0131 / P0132 / P0134: O2 Sensor (HO2S) Circuit Low
Voltage / High Voltage / No Activity Detected (Sensor-1):
”.
Is check result satisfactory?
Replace A/F sensor. Repair or replace
defective circuit.
Step Action Yes No
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