Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 837

6E–77

3.2L ENGINE DRIVEABILITY AND EMISSIONS

ECM Diagnostic Trouble Codes

The following table lists the diagnostic trouble codes
supported a Tech 2 and to flash.If any DTCs not listed
here are displayed by a Tech 2, the Tech 2 data may be

faulty; notify the Tech 2 manufacturer of any DTCs
displayed that are not included in the following table.

ECM Diagnostic Trouble Codes

DTC

using a
Tech 2

Flash DTC

Description

Type

Illuminate MIL

P0101

MAF System Performance

Yes

P0102

MAF Sensor Circuit Low Frequency

Yes

P0103

MAF Sensor Circuit High Frequency

Yes

P0107

BARO Sensor Circuit Low Voltage

Yes

P0108

BARO Sensor Circuit High Voltage

Yes

P0112

IAT Sensor Circuit Low Voltage

Yes

P0113

IAT Sensor Circuit High Voltage

Yes

P0117

ECT Sensor Circuit Low Voltage

Yes

P0118

ECT Sensor Circuit High Voltage

Yes

P0121

TP System Performance

Yes

P0122

TP Sensor Circuit Low Voltage

Yes

P0123

TP Sensor Circuit High Voltage

Yes

P0131

HO2S Circuit Low Voltage Bank 1 Sensor 1

Yes

P0132

HO2S Circuit High Voltage Bank 1 Sensor 1

Yes

P0134

HO2S Circuit Insufficient Activity Bank 1 Sensor 1

Yes

P0171

Fuel Trim System Lean Bank 1

Yes

P0172

Fuel Trim System Rich Bank 1

Yes

P0201

Injector 1 Control Circuit

Yes

P0202

Injector 2 Control Circuit

Yes

P0203

Injector 3 Control Circuit

Yes

P0204

Injector 4 Control Circuit

Yes

P0205

Injector 5 Control Circuit

Yes

P0206

Injector 6 Control Circuit

Yes

P0336

58X Reference Signal Circuit

Yes

P0337

CKP Sensor Circuit Low Frequency

Yes

P0341

CMP Sensor Circuit Performance

Yes

P0342

CMP Sensor Circuit Low

Yes

P0351

Ignition 1 Control Circuit

Yes

P0352

Ignition 2 Control Circuit

Yes

P0353

Ignition 3 Control Circuit

Yes

P0354

Ignition 4 Control Circuit

Yes

P0355

Ignition 5 Control Circuit

Yes

P0356

Ignition 6 Control Circuit

Yes

P0502

VSS Circuit Low Input

Yes

P0562

System Voltage Low

P0563

System Voltage High

6E–78

3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC

using a
Tech 2

Flash DTC

Description

Type

Illuminate MIL

P0601

ECM Memory

Yes

P1171

Fuel System Lean During Acceleration

Yes

P1508

IAC System Low RPM

Yes

P1509

IAC System High RPM

Yes

6E–79

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0101 (Flash DTC=61) MAF System

Performance

060RW077

Circuit Description

The mass air flow (MAF) sensor measures the amount of
air which passes through it into the engine during a given
time. The Engine Control Module ECM uses the mass air
flow information to monitor engine operating conditions
for fuel delivery calculations. A large quantity of air
entering the engine indicates an acceleration or high load
situation, while a small quantity or air indicates
deceleration or idle.
The MAF sensor produces a frequency signal which can
be monitored using a Tech 2. The frequency will vary
within a range of around 4 to 7 g/s at idle to around 25 to 40
g/s at maximum engine load. DTC P0101 will be set if the
signal from the MAF sensor does not match a predicted
value based on throttle position and engine RPM.

Conditions for Setting the DTC

The engine is running.

No TP sensor or BARO, CMP, CKP, MAF sensor DTCs
are set.

The Engine Speed is between 2800 r.p.m and 4500
r.p.m.

TP angle is between 1V and 3V.

IAT is between —14

C and 70

Above conditions present for at least 3 second.

MAF signal frequency indicates an airflow significantly
higher or lower than a predicted value based on throttle

position and engine RPM for a total of 12.5 seconds
over a 25-second period of time.

Action Taken When the DTC Sets

The ECM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

The ECM calculates an airflow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

The ECM 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

The ECM 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.

A history DTC P0101 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

DTC P0101 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

Poor connections.

Mis-routed harness.

Rubbed through wire insulation.

6E–80

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Broken wire inside the insulation.

Refer to Intermittents under service category Symptoms.
Any un-metered air may cause this DTC to set. Check for
the following:

The duct work at the MAF sensor for leaks.

An engine vacuum leak.

The PCV system for vacuum leaks.

An incorrect PCV valve.

The engine oil dip stick not fully seated.

The engine oil fill cap loose or missing.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Using Freeze Frame and/or Failure Records data

may aid in locating an intermittent condition. If the
DTC cannot be duplicated, the information included
in the Freeze Frame and/or Failure Records data
can be useful in determining how many miles since
the DTC set. The Fail Counter and Pass Counter
can also be used to 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 were noted. This will isolate when the
DTC failed.

For any test that requires back probing the ECM or
component harness connectors, use the Connector
Test Adapter Kit 5-8840-0385-0. Using this kit will
prevent any damage to the harness connector
terminals.

3. Any un-metered air may cause this DTC to set.

Check the PVC system for vacuum leaks. Also
inspect the dip stick for being pulled out. Check the
oil fill cap for being loose.

4. Verifies the signal circuit from the MAF sensor

electrical connector to the ECM.

5. Verifies whether a ground and B+ circuit is available.

6. Checks a signal circuit for an open.

7. Checks for a signal circuit shorted to B+.

DTC P0101 – MAF System Performance

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “ON,” engine “OFF.”
2. Review the Freeze Frame and/or Failure Records

data for this DTC and note parameters.

3. Ignition “OFF” for 15 seconds.
4. Start the engine and operate the vehicle within the

conditions required for this diagnostic to run, and as
close to the conditions recorded in Freeze Frame
/Failure Records possible. (Special operating
conditions that need to be met before the ECM will
run this diagnostic (where applicable) are listed in
“Conditions for Setting the DTC”).

5. Using the Tech 2, select “DTC,” then enter the DTC

number which was set.

Does the Tech 2 indicate that this diagnostic failed this
ignition?

—

Go to

Step 3

Refer to

Diagnostic

Aids

1. Check for the following conditions:

Objects blocking the MAF sensor inlet screen;

Intake manifold vacuum leaks;

Vacuum leaks at throttle body;

Crankcase ventilation valve faulty, missing, or
incorrectly installed.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 4

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