Isuzu 1999 RODEO Workshop Manual page 1431

6E2–188
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0141 – HO2S Heater Circuit Bank 1 Sensor 2 (Cont'd)
Step
5 Connect the test light between the Bank 1 HO2S 2
ignition feed and the Bank 1 HO2S 2 heater ground.
Does the test light illuminate?
6 1. Allow the HO2S to cool for at least 15 minutes.
2. Using a 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 ohms, repair the open or
poor connection as necessary.
Was a problem found?
11 1. Ignition "OFF."
2. Disconnect the PCM and check the continuity of the
Bank 1 HO2S 1 signal circuit and the Bank 1 HO2S
1 low circuit.
3. If the Bank 1 HO2S 1 high circuit or the HO2S low
circuit measures over 5 ohms, repair the open or
poor connection as necessary.
Was a problem found?
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?
Action Value(s) Yes
— Go to Step 6
3-6 ohms 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 8
Go to Step 10
—
—
Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 13
Go to Step 14
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