Isuzu Rodeo UE. Manual — part 239

6E1–327

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart:
4. When the engine is idling or at steady cruise, the

HO2S voltage should vary from between
approximately 100 mV to 900 mV. During ”power
enrichment” mode, more fuel is needed and the
HO2S voltage should rise above 447 mV. This step
checks to see if the HO2S is operating properly.

5. Wrap a shop towel around the fuel pressure

connector to absorb any small amount of fuel
leakage that may occur when installing the gauge.
Ignition ON, pump pressure should be 235–320
kPa.

7. Add Caution: Use correct pliers so damage to fuel

lines will not occur.

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RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC P1171 – Fuel System Lean During Acceleration

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

Are any component–related Diagnostic Trouble Codes
set?

—

Go to

component

DTC charts

Go to Step 3

3

1. Check the vehicle’s fuel tank for an adequate

amount of fuel.

2. Add fuel to the vehicle’s fuel tank if the tank is almost

empty.

Was fuel added to the vehicle’s fuel tank?

—

Go to Step 4

Go to Step 5

4

1. Using a Tech 2, observe HO2S 1 voltage while

running warm engine(75

°

C–95

°

C [167

°

F–203

°

F])

at 1200 RPM.

2. HO2S 1 voltage should vary within the specified

range.

Does the voltage toggle back and forth within the
specified range?

100– 900 mV

Go to

Diagnostic

Aids

Go to Step 5

5

1. Disconnect the fuel pump relay and crank the

engine to relieve the fuel pressure.

2. Install the fuel pressure gauge.
3. Start the engine and idle at normal operating

temperature.

4. Disconnect the vacuum line going to the fuel

pressure regulator.

With the engine running, is the fuel pressure within the
specified range?

284– 325 kPa

Go to OBD

System

Check

Go to Step 6

6

Check for restricted fuel lines or restricted in–line filter.

Was a problem found?

—

Verify repair

Go to Step 7

7

1. Ignition OFF.
2. Ignition ON, engine OFF.
3. Using a Tech 2, enable the fuel pump to operate.
4. Using pliers, slowly close the return line (do not

exceed the first specified value).

Using the pliers, can the fuel pressure be manipulated
to exceed the second specified value?

414 kPa 325

kPa

Go to

Diagnostic

Aids

Go to Step 8

8

Check for:

f

Faulty fuel pump

f

Restricted fuel pump strainer (sock)

f

Incorrect fuel pump

f

Incorrect fuel being used

f

Hot fuel

—

Verify repair

—

6E1–329

RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1336 CRANKSHAFT POSITION

SENSOR (CKP) SYSTEM VARIATION NOT LEARNED

014RX002

Circuit Description

In order to detect engine misfire at higher engine speeds,
the Powertrain Control Module (PCM) must know of any
variation between the crankshaft sensor pulse. Most
variations are due to the machining of the crankshaft
reluctor wheel, however, other sources of variation are
also possible. A Crankshaft Position Sensor Tooth Error
Correction (TEC) procedure must be performed any time
a change is made to the crankshaft sensor, crankshaft, or
if the PCM measures the variations and then calculates
compensation factors needed to enable the PCM to
accurately detect engine misfire at all speeds and loads.
The Tech 2 must be used to command the PCM to learn
these variations. If for any reason the PCM is unable to
learn these variations or they are out of an acceptable
range, the PCM will set a DTC P1336. A PCM that has not
had the Crankshaft Position Sensor Tooth Error
Correction (TEC) Procedure performed due to
replacement or reprogramming will also set a DTC
P1336. DTC P1336 is a type A code.

Conditions for Setting the DTC

f

No ECT, Knock, CKP, CMP or injector sensor DTCs.

f

PCM has not successfully learned crankshaft position
Tooth Error Correction(TEC) within 5 attempts or 5 Km
(3 miles).

Action Taken When the DTC Sets

f

The Malfunction Indicator Lamp (MIL) will illuminate
the first time the error is detected.

f

The PCM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.

f

A history DTC is stored.

Conditions for Clearing the MIL/DTC

f

The MIL will turn OFF after three consecutive ignition
cycles in which the diagnostic runs without a fault.

f

A history DTC will clear after 40 consecutive warm up
cycles without a fault.

f

DTC(s) can be cleared by using the Tech 2.

Diagnostic Aids

f

Refer to ”TEC Learn Procedure”

CAUTION: When performing the Crankshaft
Position Sensor Tooth Error Correction (TEC)
Procedure always set the vehicle parking brake and
block the drive wheels. Release the throttle
immediately when the engine starts to decelerate.
Once the learn procedure is completed, engine
control will be returned to the operator and the
engine will respond to throttle position.

DTC P1336 will only set if the PCM has not learned the
crankshaft position sensor Tooth Error Correction (TEC).
The PCM only needs to learn this variation once per life

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RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

cycle of the vehicle unless the crank sensor to crankshaft
relationship is disturbed. Removing a part for inspection
and then reinstalling the same part is considered a
disturbance. A fully warmed up engine is critical to
learning the variation correctly. If a valid learn occurs, no
other learns can be completed that ignition cycle. If the
engine cuts out before the specified learn procedure
engine speed or at normal fuel cut–off RPM. The PCM is
not in the learn procedure mode. Review the Crankshaft
Position Sensor Tooth Error Correction (TEC) Procedure
and re–enable the learn procedure. Verify that the Tech 2
says ”Test in Progress.”

Excessive Crankshaft Variation Symptom

Tech 2 Display

Possible Causes

Factors out of range

Reluctor wheel–matching
quality, run out, incorrect
air gap

Opposing factors out of
range

Disturbance–noise on
crank sensor circuit,
reattempt the Learn
procedure

Sum out of range

Engine too cold,
reattempt the Learn
Procedure

Crank pulse count error

Crank or Cam sensor
DTCs set–Repair first

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart:
1. The Powertrain OBD System Check prompts the

technician to complete some basic checks and store
the freeze frame and failure records data on the
Tech 2 if applicable. This created an electronic copy
of the data taken when the fault occurred. The
information is then stored on the Tech 2 for later
reference.

2. Engine temperature if critical to properly learn the

Crankshaft Position Sensor Tooth Error Correction
(TEC). Failure to properly warm the engine before
performing this procedure will result in an inaccurate
measurement of the Crankshaft Position Sensor
Tooth Error Correction (TEC). The PCM learns this
variation as the engine is decelerating and then
allows engine control to be returned to the operator.
All accessories must be turned OFF when learning
the Crankshaft Position System angle variation. If
the A/C is not disabled when the learn procedure is
enable, the PCM will disable the A/C. When the
PCM is ready to allow the learn procedure to run,
the Tech 2 will display ”Test in Progress.”

3. If after the specified number attempts the PCM

cannot learn the crankshaft position Sensor Tooth
Error Correction (TEC) then the variation is too
large and no variation problem is corrected.

4. Being unable to learn the Crankshaft Position

Sensor Tooth Error Correction (TEC) indicates that
the variation is out of range. Using the Excessive
Crankshaft Variation Trouble shooting will help to
diagnose the area where the problem lies.