Isuzu 1999 RODEO Workshop Manual page 797

6E1–170 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0141 – O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Step
6 1. Allow the HO2S to cool for at least 10 minutes.
2. Using a Digital Voltmeter (DVM), measure the
resistance between the Bank 1 HO2S 2 ignition
feed and the Bank 1 HO2S 2 heater ground at the
Bank 1 HO2S 2 pigtail.
Is the HO2S resistance within the specified values?
7 Repair the open Bank 1 HO2S 2 ignition feed circuit to
Bank 1 HO2S 2.
Is the action complete?
8 Repair the open Bank 1 HO2S 2 heater ground circuit.
Is the action complete?
9 1. Check for a poor connection at the Bank 1 HO2S 2
harness terminals.
2. If a poor connection is found, replace the terminals.
Was a poor connection found?
10 1. Ignition OFF.
2. Disconnect the PCM and check the continuity of the
Bank 1 HO2S 2 signal circuit and the Bank 1 HO2S
2 low circuit.
3. If the Bank 1 HO2S 2 signal circuit or the HO2S low
circuit measures over 5 W, repair the open or poor
connection as necessary.
Was a problem found?
11 Check for a poor Bank 1 HO2S 2 high or low circuit
terminal connection at the Bank 1 HO2S 2 harness
connector and replace the terminal(s) if necessary.
Did any terminals require replacement?
12 Check for a poor Bank 1 HO2S 2 low circuit terminal
connection at the PCM and replace the terminal if
necessary.
Did the terminal require replacement?
13 Check for a poor Bank 1 HO2S 2 high circuit terminal
connection at the PCM and replace the terminal if
necessary.
Did the terminal require replacement?
14 Replace Bank 1 HO2S 2.
Is the action complete?
15 Locate and repair the short to ground in Bank 1 HO2S 2
ignition feed circuit and replace the faulty fuse.
Is the action complete?
(Cont'd)
Action Value(s) Yes
3–6 W
Go to Step 9
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
No
Go to Step 10
—
—
Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 13
Go to Step 14
—
—