Isuzu 1999 RODEO Workshop Manual page 1635

6E2–392
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1154 –HO2S Transition Time Ratio Bank 2 Sensor 1 (Cont'd)
Step
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 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 HO2S 1
connector, measure the voltage between the high
signal circuit and ground.
4. Also measure the voltage between the low signal
circuit and ground.
Are both voltages in the specified range?
16 1. With Bank 2 HO2S 1 disconnected, jumper the high
and low (PCM side) signal circuits to ground.
2. Ignition "ON."
3. Using a Tech 2, monitor the Bank 2 HO2S 1 voltage.
Does the Tech 2 indicate less than 10 mV and
immediately return to about 450 mV when the jumper is
removed?
17 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?
18 Repair condition as necessary.
Is the action complete?
19 Check for faulty PCM connections or terminal damage.
Is the action complete?
20 Repair open, short or grounded signal circuit.
Is the action complete?
Action Value(s) Yes
Go to Step 13
—
— Go to Step 2
Go to Step 18
—
Go to Step
3-4V
16
Go to Step 21
—
— Verify repair
— Verify repair
— Verify repair
— Verify repair
No
Go to Step 14
—
Go to Step 15
Go to Step 19
Go to Step 22
—
—
Go to Step 20
—