Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1491
6E2–415
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1153 – HO2S Insufficient Switching Bank 2 Sensor 1
(Cont'd)
Step
No
Yes
Value(s)
Action
21
Replace Bank 2 HO2S 1.
Is the action complete?
—
Verify repair
—
22
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
—
Verify repair
—
6E2–416
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1154 HO2S Circuit Transition Time Ratio Bank 2 Sensor 1
060R200054
Circuit Description
The powertrain control module (PCM) monitors the
heated oxygen sensor (HO2S) activity for 90 seconds
after “closed loop” and stoichiometric operation have
been enabled. During the monitor period the PCM counts
the number of times that the HO2S responds from
rich-to-lean and from lean-to-rich and adds the amount of
time it took to complete all transitions. With this
information, an average time for all transitions can be
determined. The PCM then divides the rich-to-lean
average by the lean-to-rich average to obtain a ratio. If
the HO2S transition time ratio is not within this range,
DTC P1154 will be set, indicating that the oxygen sensor
is not responding as expected to changes in exhaust
oxygen content.
Conditions for Setting the DTC
D
No related DTCs.
D
Engine coolant temperature (ETC) is above 60
°
C
(140
°
F).
D
The engine is operating in “closed loop”,
D
The engine has been running at least one minute.
D
Canister purge duty cycle is greater than 2%.
D
Engine speed is between 1500 RPM and 3000 RPM.
D
Mass air flow is between 18 g/second and 42 g/second.
D
Above conditions are present for a 3-second
monitoring period.
D
90 seconds after “closed loop” and stoichiometric
operation have been enabled, Bank 2 HO2S 1
transition ratio between lean to rich and rich to lean is
less than 0.44 or greater than 3.8.
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
D
”Open loop” fuel control will be in effect.
D
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P1154 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
DTC P1154 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
A multifunction in the HO2S heater ignition feed or ground
circuit may cause a DTC P1154 to set. Check HO2S
heater circuitry for intermittent faults or poor connections.
6E2–417
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
If connections and wiring are OK and DTC P1154
continues to set, replace the Bank 2 HO2S 1.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
3. A condition that affects other heated oxygen sensors
indicates probable contamination. To avoid
damaging replacement sensors, correct the
condition which caused the contamination before
replacing the affected sensors.
5. This step checks for conditions which may cause the
heated oxygen sensor to appear faulty. Correct any
of the described conditions if present.
8. To avoid damaging replacement sensors, correct the
condition which caused the contamination before
replacing the affected sensors.
DTC P1154 – HO2S Transition Time Ratio Bank 2 Sensor 1
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
IMPORTANT: If any other DTCs are set (except P1133
and/or P1134), refer to those DTCs before proceeding
with this diagnostic chart.
1. Idle the engine at operating temperature.
2. Operate the vehicle within parameters specified
under “Conditions for Setting the DTC” criteria
included in Diagnostic Support.
3. Using a Tech 2, monitor “DTC” info for DTC P1154
until the DTC P1154 test runs.
Note the test result.
Does Tech 2 indicate DTC failed this ignition?
—
Go to
Step 3
Refer to
Diagnostic
Aids
3
Did the Tech 2 also indicate P1133, and/or P1134 test
failed?
—
Go to
Step 17
Go to
Step 4
4
Check for leaks at the exhaust pipe joints.
Are the joints leaking?
—
Go to
Step 5
Go to
Step 6
5
Tighten the U-bolt nuts at the leaking joints.
Is your action complete?
—
Go to
Step 2
—
6
Check for gaskets that are damaged or improperly
installed.
Are there damaged or misaligned gaskets?
—
Go to
Step 7
Go to
Step 8
7
1. Replace the damaged gaskets.
2. Align the connections.
3. Tighten the connections.
Is your action complete?
—
Go to
Step 2
—
8
Check for loose exhaust flange connections.
Are the flange connections loose?
—
Go to
Step 9
Go to
Step 10
9
Tighten the stud nuts or bolts to specifications.
Is your action complete?
—
Go to
Step 2
—
10
Check for burned or corroded exhaust pipes.
Are the exhaust pipes burned or corroded?
—
Go to
Step 11
Go to
Step 12
11
Replace the exhaust pipes, as required.
Is your action complete?
—
Go to
Step 2
—
6E2–418
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1154 – HO2S Transition Time Ratio Bank 2 Sensor 1
(Cont'd)
Step
No
Yes
Value(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:
D
Ensure that the Bank 2 HO2S 1 is securely
installed.
D
Check for corrosion on terminals.
D
Check terminal tension (at Bank 2 HO2S 1 and at
the PCM).
D
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.
D
Fuel contamination.
D
Use of improper RTV sealant.
D
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
—
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