Isuzu Trooper (1998-2002 year). Manual — part 498
6E–362
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
DTC P1134 – HO2S Transition Time Ratio Bank 1 Sensor 1
(Cont'd)
Step
No
Yes
Value(s)
Action
21
Replace Bank 1 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
—
6E–363
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1153 HO2S Insufficient Switching Bank 2 Sensor 1
D06R200010
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 this test period the PCM counts the
number of times that the HO2S signal voltage crosses the
rich-to-lean and lean-to-rich thresholds. If the PCM
determines that the HO2S did not switch enough times,
DTC P1153 will be set.
A lean-to-rich switch is determined when the HO2S
voltage changes above and below 450 mV.
Heated oxygen sensors are used to minimize the amount
of time required for “closed loop” fuel control operation
and to allow accurate catalyst monitoring. The oxygen
sensor heater greatly decreases the amount of time
required for fuel control sensors Bank 1 HO2S 1 and Bank
2 HO2S 1 to become active. Oxygen sensor heaters are
required by post-catalyst monitor sensors to maintain a
sufficiently high temperature for accurate exhaust oxygen
content readings further from the engine.
Conditions for Setting the DTC
D
The engine is operating in “closed loop”,
D
Engine coolant temperature (ECT) is above 60
°
C
(140
°
F).
D
The engine has been running for over 60 seconds.
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 8 g/second and 42 g/second.
D
Above conditions are present for a 3 seconds.
D
90 seconds after “closed loop” and stoichiometric
operation have been enabled, the PCM monitors the
oxygen sensor switching above and below 450 mV. If
fewer than 27 rich-to-lean and lean-to-rich switches for
Bank 2 HO2S 1 are detected, DTC P1153 will set.
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 P1153 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
DTC P1153 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
6E–364
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids
A malfunction in the HO2S heater ignition feed or ground
circuit may cause a DTC P1153 to set. Check HO2S
heater circuitry for intermittent faults or poor connections.
If connections and wiring are OK and DTC P1153
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 P1153 – HO2S Insufficient Switching 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 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 P1153
until the DTC P1153 test runs.
Note the test result.
Does Tech 2 indicate DTC failed this ignition?
—
Go to
Step 3
Check the
Procedure
Refer to
Diagnostic
Aids
3
Did the Tech 2 also indicate P1133 and/or P1134 test
failed?
—
Go to
Step 20
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
6E–365
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1153 – HO2S Insufficient Switching Bank 2 Sensor 1
(Cont'd)
Step
No
Yes
Value(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:
D
Ensure that the Bank 2 HO2S 1 is securely
installed.
D
Check for corrosion on terminals.
D
Check the 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?
—
Verify repair
Go to
Step 15
15
1. Disconnect Bank 2 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?
3-4V
Go to
Step 18
Go to
Step 16
16
1. Ignition “ON”.
2. Check for damage to PCM pins or terminals.
Was a problem found?
—
Verify repair
Go to
Step 17
17
Check for 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 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 2 HO2S 1
disconnected from the harness, check Bank 2 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 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
—
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