Isuzu 2000 Trooper Workshop Manual page 1093

6E–224
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0161 – HO2S Heater Circuit Bank 2 Sensor 2 (Cont'd)
Step
6 1. Allow the HO2S to cool for at least 15 minutes.
2. Using a DVM, measure resistance between the
Bank 2 HO2S 2 ignition feed and the Bank 2 HO2S 2
heater ground at the Bank 2 HO2S 2 pigtail.
Is the HO2S resistance within the specified values?
7 Repair the open Bank 2 HO2S 2 ignition feed circuit to
Bank 2 HO2S 2.
Is the action complete?
8 Repair the open Bank 2 HO2S 2 heater ground circuit.
Is the action complete?
9 1. Check for a poor connection at the Bank 2 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 2 HO2S 2 signal circuit and the Bank 2 HO2S
2 low circuit.
3. If the Bank 2 HO2S 2 signal circuit or 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 2 HO2S 2 signal circuit and the Bank 2 HO2S
2 low circuit.
3. If the Bank 2 HO2S 2 signal circuit or 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 2 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 2 HO2S 2 high circuit terminal
connection at the PCM and replace the terminal if
necessary.
Did the terminal require replacement?
14 Replace Bank 2 HO2S 2.
Is the action complete?
15 Locate and repair the short to ground in the Bank 2
HO2S 2 ignition feed circuit and replace the faulty fuse.
Is the action complete?
Action Value(s) Yes
Go to Step 9
3-6 ohms
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
No
Go to Step 10
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Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 13
Go to Step 14
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