Workshop Manual

6E–406
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1133 – HO2S Insufficient Switching Bank 1 Sensor 1 (Cont'd)
Step NoYesValue(s)Action
11 Replace the exhaust pipes, as required.
Is your action complete?
— Go to Step 2 —
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 1 HO2S 1 is securely
installed.
B Check for corrosion on the terminals.
B Check the terminals at Bank 1 HO2S 1 and at the
PCM.
B Check for damaged wiring.
Was a problem found in any of the above areas?
— Verify repair Go to Step 15
15 1. Disconnect Bank 1 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?
3-4 mV Go to Step 18 Go to Step 16
16 1. Ignition “OFF”.
2. Check for damage to PCM pins or terminals.
Was a problem found.
— Verify repair Go to Step 17
17 Check for a short to voltage or ground or an open in the
signal circuit.
Was a problem found?
— Verify repair Go to Step 18
18 1. Ignition “OFF”.
2. Disconnect the PCM connector.
3. With the HO2S disconnected, check for high and
low signal circuits shorted together between the
PCM and HO2S.
Was a problem found?
— Verify repair Go to Step 19
19 With the PCM connected and Bank 1 HO2S 1
disconnected from the harness, check Bank 1 HO2S 1
with a Tech 2.
Is the voltage in the specified range?
425-475 mV Go to Step 21 Go to Step 22
20 Replace the affected heated oxygen sensors.
NOTE: Before replacing the 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 —