Isuzu 1999 RODEO Workshop Manual page 1631

6E2–388
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1153 –HO2S Insufficient Switching Bank 2 Sensor 1 (Cont'd)
Step
11 Replace the exhaust pipes, as required.
Is your action complete?
12 Check for leaks at the exhaust manifold.
Are there leaks at the exhaust manifold?
13 Tighten the bolts to specifications or replace the
manifold if necessary.
Is your action complete?
14 Visually/physically inspect the following items:
f
Ensure that the Bank 2 HO2S 1 is securely
installed.
f
Check for corrosion on terminals.
f
Check the terminal tension at Bank 2 HO2S 1 and
at the PCM.
f
Check for damaged wiring.
Was a problem found in any of the above areas?
15 1. Disconnect Bank 2 HO2S 1.
2. Ignition "ON."
3. Using a DVM at the PCM side of the connector,
check the voltage between the high signal circuit
and ground. Also measure between the low signal
circuit and ground.
Are both voltages in the specified range?
16 1. Ignition "ON."
2. Check for damage to PCM pins or terminals.
Was a problem found?
17 Check for short to voltage or ground or an open in the
signal circuit.
Was a problem found?
18 1. Ignition "OFF."
2. Disconnect the PCM connector.
3. With HO2S disconnected, check for high and low
signal circuits shorted together between the PCM
and HO2S.
Was a problem found?
19 With the PCM connected and Bank 2 HO2S 1
disconnected from the harness, check Bank 2 HO2S 1
with a Tech 2.
Is the voltage in the specified range?
20 Replace affected heated oxygen sensors.
NOTE: Before replacing sensors, the cause of the
contamination must be determined and corrected.
f
Fuel contamination.
f
Use of improper RTV sealant.
f
Engine oil/coolant consumption.
Is the action complete?
Action Value(s) Yes
Go to Step 2
—
— Go to Step 13
— Go to Step 2
— Verify repair
3-4V Go to Step 18
— Verify repair
— Verify repair
— Verify repair
425-475 mV Go to Step 21
— Verify repair
No
—
Go to Step 14
—
Go to Step 15
Go to Step 16
Go to Step 17
Go to Step 18
Go to Step 19
Go to Step 22
—