Workshop Manual

6E–418
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1154 – HO2S Transition Time Ratio Bank 2 Sensor 1 (Cont'd)
Step NoYesValue(s)Action
12 Check for leaks at the exhaust manifold.
Are there leaks at the exhaust manifold?
— Go to Step 13 Go to Step 14
13 Tighten the bolts to specifications or replace the
manifold if necessary.
Is your action complete?
— Go to Step 2 —
14 Visually/physically inspect the following items:
B Ensure that the Bank 2 HO2S 1 is securely
installed.
B Check for corrosion on terminals.
B Check terminal tension (at Bank 2 HO2S 1 and at
the PCM).
B Check for damaged wiring.
Was a problem found in any of the above areas?
— Go to Step 18 Go to Step 15
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.
Also measure the voltage between the low signal
circuit and ground.
Are both voltages in the specified range?
3-4 V Go to Step 16 Go to Step 19
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?
— Go to Step 21 Go to Step 22
17 Replace affected heated oxygen sensors.
NOTE: Before replacing sensors, the cause of the
contamination must be determined and corrected.
B Fuel contamination.
B Use of improper RTV sealant.
B Engine oil/coolant consumption.
Is the action complete?
— Verify repair —
18 Repair condition as necessary.
Is the action complete?
— Verify repair —
19 Check for faulty PCM connections or terminal damage.
Is the action complete?
— Verify repair Go to Step 20
20 Repair open, short or grounded signal circuit.
Is the action complete?
— Verify repair —