DTC P0160 HO2S Circuit Insufficient
Activity Bank 2 Sensor 2
The PCM supplies a
voltage of about 450 mV between the HO2S high and low signal circuits. The
oxygen sensor varies the voltage over a range from about 1,000 mV when the
exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and
stores the heated oxygen sensor (HO2S) voltage information. The PCM evaluates
the HO2S voltage samples in order to determine the amount of time the HO2S
voltage was out of range. The PCM compares the stored HO2S voltage samples
taken within each sample period and determines if majority of the samples are
out of the operating range.
The PCM monitors the
HO2S voltage and detects if the voltage goes out of the bias range. If the PCM
does not detect the voltage went out of the bias range, a DTC sets.
Conditions
for Running the DTC
- DTCs P0101, P0102, P0103, P0112,
P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0335, P0336,
P0351-P0358, P1120, P1220, P1221, P1258, not set.
- The engine run time is greater than
70 seconds.
- The fuel system operating in Closed
Loop.
- System voltage is greater than 9.0
volts.
- The AIR, EGR, and the Catalyst
diagnostics are not active.
- The engine coolant temperature is
greater than 48°C (118°F).
Conditions
for Setting the DTC
- The HO2S signal voltage is steady
between 409 mV and 489 mV.
- All conditions present for 2 minutes
and 30 seconds.
Action
Taken When the DTC Sets
- The PCM illuminates the malfunction
indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
- The PCM records the operating
conditions at the time the diagnostic fails. The first time the diagnostic
fails, the PCM stores this information in the Failure Records. If the
diagnostic reports a failure on the second consecutive ignition cycle, the
PCM records the operating conditions at the time of the failure. The PCM
writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions
for Clearing the MIL/DTC
- The PCM turns OFF the malfunction
indicator lamp (MIL) after 3 consecutive ignition cycles that the
diagnostic runs and does not fail.
- A last test failed, or current DTC,
clears when the diagnostic runs and does not fail.
- A history DTC clears after
40 consecutive warm-up cycles, if no failures are reported by this or
any other emission related diagnostic.
- Use a scan tool in order to clear
the MIL and the DTC.
Important
- Remove any debris from the PCM connector surfaces
before servicing the PCM. Inspect the PCM connector gaskets when
diagnosing/replacing the PCM. The gaskets prevent contaminate intrusion
into the PCM.
- For any test that requires probing the PCM or a
component harness connector, use the Connector Test Adapter Kit J 35616-A .
Using this kit prevents damage to the harness connector terminals.
- An oxygen supply inside the HO2S is
necessary for proper operation. This supply of oxygen is provided through
the HO2S wires. All HO2S wires and connections should be inspected for
breaks or contamination. Refer to Heated
Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems.
- For an intermittent condition, refer
to Symptoms
.
The numbers below refer
to the step numbers on the diagnostic table.
- Idle the engine at
the normal operating temperature before performing this test. For any test
that requires probing the PCM or a component harness connector, use the
Connector Test Adapter Kit J 35616-A .
Using this kit prevents damage to the harness connector terminals.
- Using the Freeze
Frame and/or Failure Records data may aid in locating an intermittent
condition. If you cannot duplicate the DTC, the information included in
the Freeze Frame and/or Failure Records data can help determine how many
miles since the DTC set. The Fail Counter and Pass Counter can also help
determine how many ignition cycles the diagnostic reported a pass and/or a
fail. Operate the vehicle within the same freeze frame conditions (RPM,
load, vehicle speed, temperature etc.) that you observed. This will
isolate when the DTC failed. For an intermittent condition, refer to Symptoms
.
- Lower the exhaust
system to gain sufficient access to the HO2S and/or the HO2S connector if
necessary. Refer to Catalytic
Converter Replacement in Engine Exhaust. If the scan tool indicates
the HO2S voltage goes below 200 mV, indicates the HO2S circuits and the
PCM are OK.
- Disconnecting the
PCM allows using the DMM J 39200 in
order to test continuity of the circuits. This aids in locating an open or
shorted circuit.
- Disconnecting the
PCM allows using the DMM J 39200 in
order to test continuity of the circuits. This aids in locating an open or
shorted circuit.
|
Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check? |
-- |
|||
|
Important Before proceeding with this
DTC, inspect the HO2S for being secure. A sensor that is loose could cause
this DTC to set.
Does
the scan tool indicate the Bank 2 HO2S 2 voltage varying outside the
specified range? |
409-489 mV |
|||
Does
the scan tool indicate that this diagnostic failed this ignition? |
-- |
Go to Diagnostic Aids |
||
Is
the Bank 2 HO2S 2 voltage below the specified value? |
200 mV |
|||
Does
the Bank 2 HO2S 2 voltage measure above the specified value? |
375 mV |
|||
Did
you find and correct the Bank 2 HO2S 2 low circuit condition? |
2ohms |
|||
Did
you find and correct the Bank 2 HO2S 2 signal circuit condition? |
2ohms |
|||
Did
you find and correct the condition? |
-- |
|||
Did
you find and correct the condition? |
-- |
|||
Did
you find and correct the condition? |
-- |
|||
|
Replace
the Bank 2 HO2S 2. Refer to Heated
Oxygen Sensor (HO2S) Replacement - Bank 2 . Is the action complete? |
-- |
-- |
||
|
Important: Program the replacement
PCM. Refer to PCM
Replacement/Programming . Replace
the PCM. Is the action complete? |
-- |
-- |
||
Does
the scan tool indicate that this test ran and passed? |
-- |
|||
|
Select
the Capture Info option and the Review Info option using the scan tool. Does
the scan tool display any DTCs that you have not diagnosed? |
-- |
Go to the applicable
DTC table |
System OK |